Added SHT library for DIY BASIC to be compatible with newer SHT40 T/RH sensor

Removed old example files

AirGradient.cpp

@@ -109,6 +109,127 @@ int AirGradient::getPM2_Raw(){
   }
 }
 
+int AirGradient::getPM1_Raw(){
+  int pm02;
+  DATA data;
+  requestRead();
+  if (readUntil(data)) {
+    pm02 = data.PM_AE_UG_1_0;
+    return pm02;
+  } else {
+    return -1;
+  }
+}
+
+int AirGradient::getPM10_Raw(){
+  int pm02;
+  DATA data;
+  requestRead();
+  if (readUntil(data)) {
+    pm02 = data.PM_AE_UG_10_0;
+    return pm02;
+  } else {
+    return -1;
+  }
+}
+
+int AirGradient::getPM0_3Count(){
+  int count;
+  DATA data;
+  requestRead();
+  if (readUntil(data)) {
+    count = data.PM_RAW_0_3;
+    return count;
+  } else {
+    return -1;
+  }
+}
+
+int AirGradient::getPM10_0Count(){
+  int count;
+  DATA data;
+  requestRead();
+  if (readUntil(data)) {
+    count = data.PM_RAW_10_0;
+    return count;
+  } else {
+    return -1;
+  }
+}
+
+int AirGradient::getPM5_0Count(){
+  int count;
+  DATA data;
+  requestRead();
+  if (readUntil(data)) {
+    count = data.PM_RAW_5_0;
+    return count;
+  } else {
+    return -1;
+  }
+}
+
+int AirGradient::getPM2_5Count(){
+  int count;
+  DATA data;
+  requestRead();
+  if (readUntil(data)) {
+    count = data.PM_RAW_2_5;
+    return count;
+  } else {
+    return -1;
+  }
+}
+
+int AirGradient::getPM1_0Count(){
+  int count;
+  DATA data;
+  requestRead();
+  if (readUntil(data)) {
+    count = data.PM_RAW_1_0;
+    return count;
+  } else {
+    return -1;
+  }
+}
+
+int AirGradient::getPM0_5Count(){
+  int count;
+  DATA data;
+  requestRead();
+  if (readUntil(data)) {
+    count = data.PM_RAW_0_5;
+    return count;
+  } else {
+    return -1;
+  }
+}
+
+
+int AirGradient::getAMB_TMP(){
+  int count;
+  DATA data;
+  requestRead();
+  if (readUntil(data)) {
+    count = data.PM_TMP;
+    return count;
+  } else {
+    return -1;
+  }
+}
+
+int AirGradient::getAMB_HUM(){
+  int count;
+  DATA data;
+  requestRead();
+  if (readUntil(data)) {
+    count = data.PM_HUM;
+    return count;
+  } else {
+    return -1;
+  }
+}
+
 
 // Private Methods /////////////////////////////////////////////////////////////
 // Functions only available to other functions in this library
@@ -248,6 +369,21 @@ void AirGradient::loop()
           _data->PM_AE_UG_1_0 = makeWord(_payload[6], _payload[7]);
           _data->PM_AE_UG_2_5 = makeWord(_payload[8], _payload[9]);
           _data->PM_AE_UG_10_0 = makeWord(_payload[10], _payload[11]);
+
+          // Total particles count per 100ml air
+            _data->PM_RAW_0_3 = makeWord(_payload[12], _payload[13]);
+            _data->PM_RAW_0_5 = makeWord(_payload[14], _payload[15]);
+            _data->PM_RAW_1_0 = makeWord(_payload[16], _payload[17]);
+            _data->PM_RAW_2_5 = makeWord(_payload[18], _payload[19]);
+            _data->PM_RAW_5_0 = makeWord(_payload[20], _payload[21]);
+            _data->PM_RAW_10_0 = makeWord(_payload[22], _payload[23]);
+
+            // Formaldehyde concentration (PMSxxxxST units only)
+            _data->AMB_HCHO = makeWord(_payload[24], _payload[25]) / 1000;
+
+            // Temperature & humidity (PMSxxxxST units only)
+            _data->PM_TMP = makeWord(_payload[20], _payload[21]) / 10;
+            _data->PM_HUM = makeWord(_payload[22], _payload[23]) / 10;
         }
 
         _index = 0;
@@ -589,48 +725,6 @@ void AirGradient::CO2_Init(int rx_pin,int tx_pin,int baudRate){
     delay(10000);
   }
 }
-//const char* AirGradient::getCO2(int retryLimit) {
-//  int ctr = 0;
-//  int result_CO2 = getCO2_Raw();
-//  while(result_CO2 == -1){
-//    result_CO2 = getCO2_Raw();
-//    if((ctr == retryLimit) || (result_CO2 == -1)){
-//      Char_CO2[0] = 'N';
-//      Char_CO2[1] = 'U';
-//      Char_CO2[2] = 'L';
-//      Char_CO2[3] = 'L';
-//      return Char_CO2;
-//    }
-//    ctr++;
-//  }
-//  sprintf(Char_CO2,"%d", result_CO2);
-//  return Char_CO2;
-//}
-
-
-//int AirGradient::getCO2_Raw(){
-//  const byte CO2Command[] = {0xFE, 0X44, 0X00, 0X08, 0X02, 0X9F, 0X25};
-//  byte CO2Response[] = {0,0,0,0,0,0,0};
-//
-//  _SoftSerial_CO2->write(CO2Command, 7);
-//  delay(100);  //give the sensor a bit of time to respond
-//
-//  if (_SoftSerial_CO2->available()){
-//    for (int i=0; i < 7; i++) {
-//      int byte = _SoftSerial_CO2->read();
-//      CO2Response[i] = byte;
-//      if (CO2Response[0] != 254) {
-//        return -1;  //error code for debugging
-//      }
-//    }
-//    unsigned long val = CO2Response[3]*256 + CO2Response[4];
-//    return val;
-//  }
-//  else
-//  {
-//  return -2; //error code for debugging
-//  }
-//}
 
 int AirGradient::getCO2(int numberOfSamplesToTake) {
   int successfulSamplesCounter = 0;
@@ -664,14 +758,12 @@ int AirGradient::getCO2_Raw() {
   while(_SoftSerial_CO2->available())  // flush whatever we might have
       _SoftSerial_CO2->read();
 
-  const byte CO2Command[] = {0xFE, 0X44, 0X00, 0X08, 0X02, 0X9F, 0X25};
+  const byte CO2Command[] = {0XFE, 0X04, 0X00, 0X03, 0X00, 0X01, 0XD5, 0XC5};
   byte CO2Response[] = {0,0,0,0,0,0,0};
-
-  // tt
   int datapos = -1;
-  //
 
-  const int commandSize = 7;
+  const int commandSize = 8;
+  const int responseSize = 7;
 
   int numberOfBytesWritten = _SoftSerial_CO2->write(CO2Command, commandSize);
 
@@ -682,7 +774,7 @@ int AirGradient::getCO2_Raw() {
 
   // attempt to read response
   int timeoutCounter = 0;
-  while (_SoftSerial_CO2->available() < commandSize) {
+  while (_SoftSerial_CO2->available() < responseSize) {
       timeoutCounter++;
       if (timeoutCounter > 10) {
         // timeout when reading response
@@ -692,22 +784,15 @@ int AirGradient::getCO2_Raw() {
   }
 
   // we have 7 bytes ready to be read
-  for (int i=0; i < commandSize; i++) {
+  for (int i=0; i < responseSize; i++) {
     CO2Response[i] = _SoftSerial_CO2->read();
-
-    // tt
             if ((CO2Response[i] == 0xFE) && (datapos == -1)){
 				datapos = i;
 			}
             Serial.print (CO2Response[i],HEX);
 			Serial.print (":");
-    //
   }
- // return CO2Response[3]*256 + CO2Response[4];
-// tt
  return CO2Response[datapos + 3]*256 + CO2Response[datapos + 4];
- //
-
 }
 
 //END CO2 FUNCTIONS //

AirGradient.h

@@ -186,6 +186,21 @@ class AirGradient
       uint16_t PM_AE_UG_1_0;
       uint16_t PM_AE_UG_2_5;
       uint16_t PM_AE_UG_10_0;
+
+      // Raw particles count (number of particles in 0.1l of air
+      uint16_t PM_RAW_0_3;
+      uint16_t PM_RAW_0_5;
+      uint16_t PM_RAW_1_0;
+      uint16_t PM_RAW_2_5;
+      uint16_t PM_RAW_5_0;
+      uint16_t PM_RAW_10_0;
+
+      // Formaldehyde (HCHO) concentration in mg/m^3 - PMSxxxxST units only
+      uint16_t AMB_HCHO;
+
+      // Temperature & humidity - PMSxxxxST units only
+      int16_t PM_TMP;
+      uint16_t PM_HUM;
     };
 
     void PMS(Stream&);
@@ -197,8 +212,22 @@ class AirGradient
     void requestRead();
     bool read_PMS(DATA& data);
     bool readUntil(DATA& data, uint16_t timeout = SINGLE_RESPONSE_TIME);
+
+
     const char* getPM2();
     int getPM2_Raw();
+    int getPM1_Raw();
+    int getPM10_Raw();
+
+    int getPM0_3Count();
+    int getPM0_5Count();
+    int getPM1_0Count();
+    int getPM2_5Count();
+    int getPM5_0Count();
+    int getPM10_0Count();
+
+    int getAMB_TMP();
+    int getAMB_HUM();
 
     //PMS VARIABLES PUBLIC_END
 
@@ -252,7 +281,7 @@ class AirGradient
     enum STATUS { STATUS_WAITING, STATUS_OK };
     enum MODE { MODE_ACTIVE, MODE_PASSIVE };
 
-    uint8_t _payload[12];
+    uint8_t _payload[32];
     Stream* _stream;
     DATA* _data;
     STATUS _PMSstatus;
@@ -264,7 +293,9 @@ class AirGradient
     uint16_t _calculatedChecksum;
     SoftwareSerial *_SoftSerial_PMS;
     void loop();
-    char Char_PM2[10];
+    char Char_PM1[10];
+    	char Char_PM2[10];
+    	char Char_PM10[10];
     //PMS VARIABLES PRIVATE END
 
     //TMP_RH VARIABLES PRIVATE START

examples/C02_CALIBRATION/C02_CALIBRATION.ino

@@ -0,0 +1,127 @@
+/*
+ This is the code for forced calibration of the SenseAir S8 sensor. The sensor also has a one-week automatic baseline calibration that should calibrate the sensor latest after one week.0
+ However if you need a faster calibration please proceed as following:
+
+ 1. Flash this code
+ 2. Bring the sensor outside into fresh air and leave it there for at least 10 minutes
+ 3. Power on the sensor
+ 4. Follow the instructions on the display
+ 5. After the calibration has been done, flash back the previous code for AQ measurements
+
+ The codes needs the following libraries installed:
+  “S8_UART” by Josep Comas tested with version 1.0.1
+  “U8g2” by oliver tested with version 2.32.15
+
+Many thanks to Josep Comas of the S8_UART library from which parts of below code are borrowed.
+
+ */
+
+#include <Arduino.h>
+#include "s8_uart.h"
+#include <U8g2lib.h>
+
+/* BEGIN CONFIGURATION */
+
+// Display
+//U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);//for DIY PRO
+U8G2_SSD1306_64X48_ER_1_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE); //for DIY BASIC
+
+#define DEBUG_BAUDRATE 115200
+
+#if (defined USE_SOFTWARE_SERIAL || defined ARDUINO_ARCH_RP2040)
+  #define S8_RX_PIN 2
+  #define S8_TX_PIN 0
+#else
+  #define S8_UART_PORT  1
+#endif
+
+#define COUNTDOWN (60) //seconds
+
+/* END CONFIGURATION */
+
+#ifdef USE_SOFTWARE_SERIAL
+  SoftwareSerial S8_serial(S8_RX_PIN, S8_TX_PIN);
+#else
+  #if defined(ARDUINO_ARCH_RP2040)
+    REDIRECT_STDOUT_TO(Serial)
+    UART S8_serial(S8_TX_PIN, S8_RX_PIN, NC, NC);
+  #else
+    HardwareSerial S8_serial(S8_UART_PORT);
+  #endif
+#endif
+
+
+S8_UART *sensor_S8;
+S8_sensor sensor;
+
+
+void setup() {
+  Serial.begin(DEBUG_BAUDRATE);
+  u8g2.begin();
+  int i = 0;
+  while (!Serial && i < 50) {
+    delay(10);
+    i++;
+  }
+  S8_serial.begin(S8_BAUDRATE);
+  sensor_S8 = new S8_UART(S8_serial);
+  sensor_S8->get_firmware_version(sensor.firm_version);
+  int len = strlen(sensor.firm_version);
+  if (len == 0) {
+      Serial.println("SenseAir S8 CO2 sensor not found!");
+      updateOLED2("SenseAir", "not", "found");
+      while (1) { delay(1); };
+  }
+  Serial.println(">>> SenseAir S8 NDIR CO2 sensor <<<");
+  printf("Firmware version: %s\n", sensor.firm_version);
+  sensor.sensor_id = sensor_S8->get_sensor_ID();
+  Serial.print("Sensor ID: 0x"); printIntToHex(sensor.sensor_id, 4); Serial.println("");
+  Serial.println("Now, you put the sensor outside and wait.");
+  Serial.println("Countdown begins...");
+  unsigned int seconds = COUNTDOWN;
+  while (seconds > 0) {
+    printf("Time remaining: %d minutes %d seconds\n", seconds / 60, seconds % 60);
+    updateOLED2("Wait", "for", String(seconds) + " Sec");
+    delay(1000);
+    seconds--;
+  }
+  Serial.println("Time reamining: 0 minutes 0 seconds");
+  // Start manual calibration
+  Serial.println("Starting manual calibration...");
+  updateOLED2("Starting", "Manual", "Calibration");
+  delay(2000);
+  if (!sensor_S8->manual_calibration()) {
+    Serial.println("Error setting manual calibration!");
+    updateOLED2("Error", "Manual", "Calibration");
+    while (1) { delay(10); }
+  }
+}
+
+void loop() {
+  static unsigned int elapsed = 0;
+  delay(2000);
+  elapsed += 2;
+
+  // Check if background calibration is finished
+  sensor.ack = sensor_S8->get_acknowledgement();
+  if (sensor.ack & S8_MASK_CO2_BACKGROUND_CALIBRATION) {
+    printf("Manual calibration is finished. Elapsed: %u seconds\n", elapsed);
+    updateOLED2("Calibration", "finished", "");
+    while (1) { delay(10); }
+  } else {
+    Serial.println("Doing manual calibration...");
+    updateOLED2("Doing", "manual", "calibration");
+  }
+}
+
+void updateOLED2(String ln1, String ln2, String ln3) {
+      char buf[9];
+          u8g2.firstPage();
+          u8g2.firstPage();
+          do {
+          u8g2.setFont(u8g2_font_t0_16_tf);
+          u8g2.drawStr(1, 10, String(ln1).c_str());
+          u8g2.drawStr(1, 28, String(ln2).c_str());
+          u8g2.drawStr(1, 46, String(ln3).c_str());
+            } while ( u8g2.nextPage() );
+}

examples/C02_SIMPLE/C02_SIMPLE.ino

@@ -17,7 +17,8 @@ https://www.airgradient.com/
 
 Kits with all required components are available at https://www.airgradient.com/open-airgradient/shop/
 
-MIT License
+CC BY-SA 4.0 Attribution-ShareAlike 4.0 International License
+
 */
 
 #include <AirGradient.h>

examples/CO2_TRAFFIC_LIGHT/CO2_TRAFFIC_LIGHT_SIMPLE.ino

@@ -21,7 +21,8 @@ If you have any questions please visit our forum at https://forum.airgradient.co
 If you are a school or university contact us for a free trial on the AirGradient platform.
 https://www.airgradient.com/
 
-MIT License
+CC BY-SA 4.0 Attribution-ShareAlike 4.0 International License
+
 */
 
 #include <AirGradient.h>

examples/DIY_BASIC/DIY_BASIC.ino

@@ -9,7 +9,8 @@ Kits (including a pre-soldered version) are available: https://www.airgradient.c
 
 The codes needs the following libraries installed:
 “WifiManager by tzapu, tablatronix” tested with version 2.0.11-beta
-"ESP8266 and ESP32 OLED driver for SSD1306 displays by ThingPulse, Fabrice Weinberg" tested with Version 4.1.0
+“U8g2” by oliver tested with version 2.32.15
+"Arduino-SHT" by Johannes Winkelmann Version 1.2.2
 
 Configuration:
 Please set in the code below the configuration parameters.
@@ -29,26 +30,32 @@ MIT License
 #include <ESP8266WiFi.h>
 #include <ESP8266HTTPClient.h>
 #include <WiFiClient.h>
-#include <Wire.h>
-#include "SSD1306Wire.h"
+#include <U8g2lib.h>
+#include "SHTSensor.h"
 
 AirGradient ag = AirGradient();
+SHTSensor sht;
+
+U8G2_SSD1306_64X48_ER_1_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE); //for DIY BASIC
 
-SSD1306Wire display(0x3c, SDA, SCL);
 
 // CONFIGURATION START
 
-// set to true to switch PM2.5 from ug/m3 to US AQI
-boolean inUSaqi = true;
+//set to the endpoint you would like to use
+String APIROOT = "http://hw.airgradient.com/";
 
 // set to true to switch from Celcius to Fahrenheit
 boolean inF = false;
 
-// set to true if you want to connect to wifi. The display will show values only when the sensor has wifi connection
+// PM2.5 in US AQI (default ug/m3)
+boolean inUSAQI = false;
+
+// set to true if you want to connect to wifi. You have 60 seconds to connect. Then it will go into an offline mode.
 boolean connectWIFI=true;
 
 // CONFIGURATION END
 
+
 unsigned long currentMillis = 0;
 
 const int oledInterval = 5000;
@@ -69,28 +76,24 @@ const int tempHumInterval = 2500;
 unsigned long previousTempHum = 0;
 float temp = 0;
 int hum = 0;
-int displaypage = 0;
-
-String APIROOT = "http://hw.airgradient.com/";
-
-
+long val;
 
 void setup()
 {
   Serial.begin(115200);
-
-  display.init();
-  display.flipScreenVertically();
+  sht.init();
+  sht.setAccuracy(SHTSensor::SHT_ACCURACY_MEDIUM);
+  u8g2.setBusClock(100000);
+  u8g2.begin();
+  updateOLED();
 
     if (connectWIFI) {
     connectToWifi();
   }
-
-  showTextRectangle("Init", String(ESP.getChipId(), HEX), true);
-
+  updateOLED2("Warm Up", "Serial#", String(ESP.getChipId(), HEX));
   ag.CO2_Init();
   ag.PMS_Init();
-  ag.TMP_RH_Init(0x44);
+  //ag.TMP_RH_Init(0x44);
 }
 
 
@@ -126,9 +129,19 @@ void updateTempHum()
 {
     if (currentMillis - previousTempHum >= tempHumInterval) {
       previousTempHum += tempHumInterval;
-      TMP_RH result = ag.periodicFetchData();
-      temp = result.t;
-      hum = result.rh;
+    if (sht.readSample()) {
+      Serial.print("SHT:\n");
+      Serial.print("  RH: ");
+      Serial.print(sht.getHumidity(), 2);
+      Serial.print("\n");
+      Serial.print("  T:  ");
+      Serial.print(sht.getTemperature(), 2);
+      Serial.print("\n");
+      temp = sht.getTemperature();
+      hum = sht.getHumidity();
+        } else {
+      Serial.print("Error in readSample()\n");
+      }
       Serial.println(String(temp));
     }
 }
@@ -137,46 +150,38 @@ void updateOLED() {
    if (currentMillis - previousOled >= oledInterval) {
      previousOled += oledInterval;
 
-switch (displaypage) {
-  case 0:
-          if (inUSaqi) {
-          showTextRectangle("AQI", String(PM_TO_AQI_US(pm25)), false);
-          } else {
-          showTextRectangle("PM2", String(pm25), false);
-          }
-       displaypage = 1;
-       break;
-  case 1:
-       showTextRectangle("CO2", String(Co2), false);
-       displaypage = 2;
-       break;
-  case 2:
-        if (inF) {
-          showTextRectangle("F", String((temp * 9 / 5) + 32), false);
-      } else {
-        showTextRectangle("C", String(temp), false);
-      }
-       displaypage = 3;
-       break;
-  case 3:
-       showTextRectangle("Hum", String(hum)+"%", false);
-       displaypage = 0;
-       break;
+    String ln1;
+    String ln2;
+    String ln3;
+
+
+    if (inUSAQI){
+       ln1 = "AQI:" + String(PM_TO_AQI_US(pm25)) ;
+    } else {
+       ln1 = "PM: " + String(pm25) +"ug" ;
     }
+
+    ln2 = "CO2:" + String(Co2);
+
+      if (inF) {
+        ln3 = String((temp* 9 / 5) + 32).substring(0,4) + " " + String(hum)+"%";
+        } else {
+        ln3 = String(temp).substring(0,4) + " " + String(hum)+"%";
+       }
+     updateOLED2(ln1, ln2, ln3);
    }
 }
 
-void showTextRectangle(String ln1, String ln2, boolean small) {
-  display.clear();
-  display.setTextAlignment(TEXT_ALIGN_LEFT);
-  if (small) {
-    display.setFont(ArialMT_Plain_16);
-  } else {
-    display.setFont(ArialMT_Plain_24);
-  }
-  display.drawString(32, 16, ln1);
-  display.drawString(32, 38, ln2);
-  display.display();
+void updateOLED2(String ln1, String ln2, String ln3) {
+      char buf[9];
+          u8g2.firstPage();
+          u8g2.firstPage();
+          do {
+          u8g2.setFont(u8g2_font_t0_16_tf);
+          u8g2.drawStr(1, 10, String(ln1).c_str());
+          u8g2.drawStr(1, 28, String(ln2).c_str());
+          u8g2.drawStr(1, 46, String(ln3).c_str());
+            } while ( u8g2.nextPage() );
 }
 
 void sendToServer() {
@@ -190,7 +195,6 @@ void sendToServer() {
       + (hum < 0 ? "" : ", \"rhum\":" + String(hum))
       + "}";
 
-
       if(WiFi.status()== WL_CONNECTED){
         Serial.println(payload);
         String POSTURL = APIROOT + "sensors/airgradient:" + String(ESP.getChipId(), HEX) + "/measures";
@@ -215,10 +219,12 @@ void sendToServer() {
  void connectToWifi() {
    WiFiManager wifiManager;
    //WiFi.disconnect(); //to delete previous saved hotspot
-   String HOTSPOT = "AIRGRADIENT-" + String(ESP.getChipId(), HEX);
-   wifiManager.setTimeout(60);
+   String HOTSPOT = "AG-" + String(ESP.getChipId(), HEX);
+   updateOLED2("Connect", "Wifi AG-", String(ESP.getChipId(), HEX));
+   delay(2000);
+   wifiManager.setTimeout(90);
    if (!wifiManager.autoConnect((const char * ) HOTSPOT.c_str())) {
-     showTextRectangle("offline", "mode", true);
+     updateOLED2("Booting", "offline", "mode");
      Serial.println("failed to connect and hit timeout");
      delay(6000);
    }

examples/DIY_OUTDOOR/DIY_OUTDOOR.ino

@@ -0,0 +1,212 @@
+/*
+Important: This code is only for the AirGradient DIY OUTDOOR.
+
+Build Instructions: https://www.airgradient.com/open-airgradient/instructions/diy-outdoor/
+
+Kits (including a pre-soldered version) are available: https://www.airgradient.com/open-airgradient/kits/
+
+Configuration:
+Install required libraries
+Patch PMS library to accept temperature and humidity from PMS5003T
+
+If you have any questions please visit our forum at https://forum.airgradient.com/
+
+If you are a school or university contact us for a free trial on the AirGradient platform.
+https://www.airgradient.com/
+
+CC BY-SA 4.0 Attribution-ShareAlike 4.0 International License
+*/
+
+#include "PMS.h"
+#include "SoftwareSerial.h"
+#include <Wire.h>
+
+#include <WiFiManager.h>
+#include <ESP8266WiFi.h>
+#include <ESP8266HTTPClient.h>
+#include <WiFiClient.h>
+
+SoftwareSerial softSerial(D6, D5);
+SoftwareSerial soft2(D3, D7);
+
+
+PMS pms(softSerial);
+PMS pms2(soft2);
+PMS::DATA data;
+PMS::DATA data2;
+
+float pm1Value=0;
+int pm1Position = 0;
+
+float pm2Value=0;
+int pm2Position = 0;
+
+float temp_pm1 = 0;
+float hum_pm1 = 0;
+
+float temp_pm2 = 0;
+float hum_pm2 = 0;
+
+unsigned long currentMillis = 0;
+
+const int pm1Interval = 5000;
+unsigned long previousPm1 = 0;
+
+const int pm2Interval = 5000;
+unsigned long previousPm2 = 0;
+
+String APIROOT = "http://hw.airgradient.com/";
+
+void setup()
+{
+  Serial.begin(115200);
+  Serial.println("Chip ID: "+String(ESP.getChipId()));
+  softSerial.begin(9600);
+  soft2.begin(9600);
+  Wire.begin();
+  pinMode(D7, OUTPUT);
+  connectToWifi();
+}
+
+
+void loop()
+{
+  currentMillis = millis();
+  updatePm1();
+  updatePm2();
+}
+
+
+void updatePm1()
+{
+    if (currentMillis - previousPm1 >= pm1Interval) {
+      digitalWrite(D7, HIGH);
+      delay(400);
+      digitalWrite(D7, LOW);
+      Serial.println("updatePm1: "+String(pm1Position));
+      previousPm1 += pm1Interval;
+        pms.requestRead();
+        if (pms.readUntil(data)){
+          Serial.println("success read");
+            int pm1 = data.PM_AE_UG_2_5;
+            temp_pm1 = data.AMB_TMP;
+            hum_pm1 = data.AMB_HUM;
+            Serial.print("PMS 1: PM 2.5 (ug/m3): ");
+            Serial.println(pm1);
+            Serial.print("PMS 1: Temp: ");
+            Serial.println(temp_pm1);
+            Serial.print("PMS 1: Hum: ");
+            Serial.println(hum_pm1);
+            Serial.println();
+            delay(1000);
+            pm1Value=pm1Value+pm1;
+            pm1Position++;
+            if (pm1Position==20) {
+              sendToServerPM1(pm1Value);
+              pm1Position=0;
+              pm1Value=0;
+            }
+              }
+    }
+}
+
+void updatePm2()
+{
+    if (currentMillis - previousPm2 >= pm2Interval) {
+      Serial.println("updatePm2: "+String(pm2Position));
+      previousPm2 += pm2Interval;
+      pms2.requestRead();
+          if (pms2.readUntil(data2)){
+            int pm2 = data2.PM_AE_UG_2_5;
+            temp_pm2 = data2.AMB_TMP ;
+            hum_pm2 = data2.AMB_HUM;
+            Serial.print("PMS 2: PM 2.5 (ug/m3): ");
+            Serial.println(pm2);
+            Serial.print("PMS 2: Temp: ");
+            Serial.println(temp_pm2);
+            Serial.print("PMS 2: Hum: ");
+            Serial.println(hum_pm2);
+            Serial.println();
+            delay(1000);
+        pm2Value=pm2Value+pm2;
+            pm2Position++;
+            if (pm2Position==20) {
+              sendToServerPM2(pm2Value);
+              pm2Position=0;
+              pm2Value=0;
+            }
+              }
+    }
+}
+
+void sendToServerPM1(float pm1Value) {
+      String payload = "{\"wifi\":" + String(WiFi.RSSI())
+      + ", \"pm02\":" + String(pm1Value/20)
+      + ", \"atmp\":" + String(temp_pm1/10)
+      + ", \"rhum\":" + String(hum_pm1/10)
+      + "}";
+
+      if(WiFi.status()== WL_CONNECTED){
+        digitalWrite(D7, HIGH);
+        delay(300);
+        Serial.println(payload);
+        String POSTURL = APIROOT + "sensors/airgradient:" + String(ESP.getChipId()) + "-1/measures";
+        Serial.println(POSTURL);
+        WiFiClient client;
+        HTTPClient http;
+        http.begin(client, POSTURL);
+        http.addHeader("content-type", "application/json");
+        int httpCode = http.POST(payload);
+        String response = http.getString();
+        Serial.println(httpCode);
+        Serial.println(response);
+        http.end();
+        digitalWrite(D7, LOW);
+      }
+      else {
+        Serial.println("WiFi Disconnected");
+      }
+}
+
+
+void sendToServerPM2(float pm2Value) {
+      String payload = "{\"wifi\":" + String(WiFi.RSSI())
+      + ", \"pm02\":" + String(pm2Value/20)
+      + ", \"atmp\":" + String(temp_pm2/10)
+      + ", \"rhum\":" + String(hum_pm2/10)
+      + "}";
+
+      if(WiFi.status()== WL_CONNECTED){
+        digitalWrite(D7, HIGH);
+        delay(300);
+        Serial.println(payload);
+        String POSTURL = APIROOT + "sensors/airgradient:" + String(ESP.getChipId()) + "-2/measures";
+        Serial.println(POSTURL);
+        WiFiClient client;
+        HTTPClient http;
+        http.begin(client, POSTURL);
+        http.addHeader("content-type", "application/json");
+        int httpCode = http.POST(payload);
+        String response = http.getString();
+        Serial.println(httpCode);
+        Serial.println(response);
+        http.end();
+        digitalWrite(D7, LOW);
+      }
+      else {
+        Serial.println("WiFi Disconnected");
+      }
+}
+
+
+// Wifi Manager
+ void connectToWifi() {
+   WiFiManager wifiManager;
+   //WiFi.disconnect(); //to delete previous saved hotspot
+   String HOTSPOT = "AIRGRADIENT-" + String(ESP.getChipId());
+   wifiManager.setTimeout(60);
+   if (!wifiManager.autoConnect((const char * ) HOTSPOT.c_str())) {
+     Serial.println("failed to connect and hit timeout");
+     delay(6000);
+   }
+}

examples/DIY_OUTDOOR_C3/DIY_OUTDOOR_C3.ino

@@ -0,0 +1,277 @@
+/*
+Important: This code is only for the DIY OUTDOOR OPEN AIR Presoldered Kit with the ESP-C3.
+
+It is a high quality outdoor air quality sensor with dual PM2.5 modules and can send data over Wifi.
+
+Kits are available: https://www.airgradient.com/open-airgradient/kits/
+
+The codes needs the following libraries installed:
+“WifiManager by tzapu, tablatronix” tested with version 2.0.11-beta
+“pms” by Markusz Kakl version 1.1.0 (needs to be patched for 5003T model)
+
+For built instructions and how to patch the PMS library: https://www.airgradient.com/open-airgradient/instructions/diy-open-air-presoldered-v11/
+
+Note that below code only works with both PM sensor modules connected.
+
+If you have any questions please visit our forum at https://forum.airgradient.com/
+
+CC BY-SA 4.0 Attribution-ShareAlike 4.0 International License
+
+*/
+
+#include "PMS.h"
+#include <HardwareSerial.h>
+#include <Wire.h>
+#include <HTTPClient.h>
+#include <WiFiManager.h>
+
+#define DEBUG true
+
+HTTPClient client;
+
+PMS pms1(Serial0);
+PMS::DATA data1;
+
+float pm1Value01=0;
+float pm1Value25=0;
+float pm1Value10=0;
+float pm1PCount=0;
+float pm1temp = 0;
+float pm1hum = 0;
+
+PMS pms2(Serial1);
+PMS::DATA data2;
+
+float pm2Value01=0;
+float pm2Value25=0;
+float pm2Value10=0;
+float pm2PCount=0;
+float pm2temp = 0;
+float pm2hum = 0;
+
+int countPosition = 0;
+int targetCount = 20;
+
+
+String APIROOT = "http://hw.airgradient.com/";
+
+int loopCount = 0;
+
+
+void IRAM_ATTR isr() {
+  debugln("pushed");
+}
+
+// select board LOLIN C3 mini to flash
+void setup() {
+    if (DEBUG) {
+      Serial.begin(115200);
+      // see https://github.com/espressif/arduino-esp32/issues/6983
+      Serial.setTxTimeoutMs(0);   // <<<====== solves the delay issue
+    }
+
+    debug("starting ...");
+    debug("Serial Number: "+ getNormalizedMac());
+
+    // default hardware serial, PMS connector on the right side of the C3 mini on the Open Air
+    Serial0.begin(9600);
+
+    // second hardware serial, PMS connector on the left side of the C3 mini on the Open Air
+    Serial1.begin(9600, SERIAL_8N1, 0, 1);
+
+    // led
+    pinMode(10, OUTPUT);
+
+    // push button
+    pinMode(9, INPUT_PULLUP);
+    attachInterrupt(9, isr, FALLING);
+
+    pinMode(2, OUTPUT);
+    digitalWrite(2, LOW);
+
+    // give the PMSs some time to start
+    countdown(3);
+
+    connectToWifi();
+    sendPing();
+    switchLED(false);
+}
+
+void loop() {
+  if(WiFi.status()== WL_CONNECTED) {
+     if (pms1.readUntil(data1, 2000) && pms2.readUntil(data2, 2000)) {
+        pm1Value01=pm1Value01+data1.PM_AE_UG_1_0;
+        pm1Value25=pm1Value25+data1.PM_AE_UG_2_5;
+        pm1Value10=pm1Value10+data1.PM_AE_UG_10_0;
+        pm1PCount=pm1PCount+data1.PM_RAW_0_3;
+        pm1temp=pm1temp+data1.AMB_TMP;
+        pm1hum=pm1hum+data1.AMB_HUM;
+        pm2Value01=pm2Value01+data2.PM_AE_UG_1_0;
+        pm2Value25=pm2Value25+data2.PM_AE_UG_2_5;
+        pm2Value10=pm2Value10+data2.PM_AE_UG_10_0;
+        pm2PCount=pm2PCount+data2.PM_RAW_0_3;
+        pm2temp=pm2temp+data2.AMB_TMP;
+        pm2hum=pm2hum+data2.AMB_HUM;
+        countPosition++;
+        if (countPosition==targetCount) {
+          pm1Value01 = pm1Value01 / targetCount;
+          pm1Value25 = pm1Value25 / targetCount;
+          pm1Value10 = pm1Value10 / targetCount;
+          pm1PCount = pm1PCount / targetCount;
+          pm1temp = pm1temp / targetCount;
+          pm1hum = pm1hum / targetCount;
+          pm2Value01 = pm2Value01 / targetCount;
+          pm2Value25 = pm2Value25 / targetCount;
+          pm2Value10 = pm2Value10 / targetCount;
+          pm2PCount = pm2PCount / targetCount;
+          pm2temp = pm2temp / targetCount;
+          pm2hum = pm2hum / targetCount;
+          postToServer(pm1Value01, pm1Value25,pm1Value10,pm1PCount, pm1temp,pm1hum,pm2Value01, pm2Value25,pm2Value10,pm2PCount, pm2temp,pm2hum);
+
+          countPosition=0;
+          pm1Value01=0;
+          pm1Value25=0;
+          pm1Value10=0;
+          pm1PCount=0;
+          pm1temp=0;
+          pm1hum=0;
+          pm2Value01=0;
+          pm2Value25=0;
+          pm2Value10=0;
+          pm2PCount=0;
+          pm2temp=0;
+          pm2hum=0;
+        }
+     }
+
+  }
+
+countdown(2);
+}
+
+void debug(String msg) {
+  if (DEBUG)
+  Serial.print(msg);
+}
+
+void debug(int msg) {
+  if (DEBUG)
+  Serial.print(msg);
+}
+
+void debugln(String msg) {
+  if (DEBUG)
+  Serial.println(msg);
+}
+
+void debugln(int msg) {
+  if (DEBUG)
+  Serial.println(msg);
+}
+
+void switchLED(boolean ledON) {
+ if (ledON) {
+     digitalWrite(10, HIGH);
+  } else {
+    digitalWrite(10, LOW);
+  }
+}
+
+void sendPing(){
+      String payload = "{\"wifi\":" + String(WiFi.RSSI())
+    + ", \"boot\":" + loopCount
+    + "}";
+    sendPayload(payload);
+}
+
+void postToServer(int pm1Value01, int pm1Value25, int pm1Value10, int pm1PCount, float pm1temp, float pm1hum,int pm2Value01, int pm2Value25, int pm2Value10, int pm2PCount, float pm2temp, float pm2hum) {
+    String payload = "{\"wifi\":" + String(WiFi.RSSI())
+    + ", \"pm01\":" + String((pm1Value01+pm2Value01)/2)
+    + ", \"pm02\":" + String((pm1Value25+pm2Value25)/2)
+    + ", \"pm10\":" + String((pm1Value10+pm2Value10)/2)
+    + ", \"pm003_count\":" + String((pm1PCount+pm2PCount)/2)
+    + ", \"atmp\":" + String((pm1temp+pm2temp)/20)
+    + ", \"rhum\":" + String((pm1hum+pm2hum)/20)
+    + ", \"boot\":" + loopCount
+     + ", \"channels\": {"
+        + "\"1\":{"
+        + "\"pm01\":" + String(pm1Value01)
+         + ", \"pm02\":" + String(pm1Value25)
+         + ", \"pm10\":" + String(pm1Value10)
+         + ", \"pm003_count\":" + String(pm1PCount)
+         + ", \"atmp\":" + String(pm1temp/10)
+         + ", \"rhum\":" + String(pm1hum/10)
+         + "}"
+         + ", \"2\":{"
+         + " \"pm01\":" + String(pm1Value01)
+         + ", \"pm02\":" + String(pm2Value25)
+         + ", \"pm10\":" + String(pm2Value10)
+         + ", \"pm003_count\":" + String(pm2PCount)
+         + ", \"atmp\":" + String(pm2temp/10)
+         + ", \"rhum\":" + String(pm2hum/10)
+         + "}"
+      + "}"
+    + "}";
+    sendPayload(payload);
+}
+
+void sendPayload(String payload) {
+      if(WiFi.status()== WL_CONNECTED){
+      switchLED(true);
+      String url = APIROOT + "sensors/airgradient:" + getNormalizedMac() + "/measures";
+      debugln(url);
+      debugln(payload);
+      client.setConnectTimeout(5 * 1000);
+      client.begin(url);
+      client.addHeader("content-type", "application/json");
+      int httpCode = client.POST(payload);
+      debugln(httpCode);
+      client.end();
+      resetWatchdog();
+      switchLED(false);
+    }
+    else {
+      debug("post skipped, not network connection");
+    }
+    loopCount++;
+}
+
+void countdown(int from) {
+  debug("\n");
+  while (from > 0) {
+    debug(String(from--));
+    debug(" ");
+    delay(1000);
+  }
+  debug("\n");
+}
+
+void resetWatchdog() {
+    digitalWrite(2, HIGH);
+    delay(20);
+    digitalWrite(2, LOW);
+}
+
+// Wifi Manager
+ void connectToWifi() {
+   WiFiManager wifiManager;
+   switchLED(true);
+   //WiFi.disconnect(); //to delete previous saved hotspot
+   String HOTSPOT = "AG-" + String(getNormalizedMac());
+   wifiManager.setTimeout(180);
+
+
+   if (!wifiManager.autoConnect((const char * ) HOTSPOT.c_str())) {
+    switchLED(false);
+     Serial.println("failed to connect and hit timeout");
+     delay(6000);
+   }
+
+}
+
+String getNormalizedMac() {
+  String mac = WiFi.macAddress();
+  mac.replace(":", "");
+  mac.toLowerCase();
+  return mac;
+}

examples/DIY_PRO/DIY_PRO.ino

@@ -19,7 +19,7 @@ If you have any questions please visit our forum at https://forum.airgradient.co
 If you are a school or university contact us for a free trial on the AirGradient platform.
 https://www.airgradient.com/
 
-MIT License
+CC BY-SA 4.0 Attribution-ShareAlike 4.0 International License
 
 */
 
@@ -78,7 +78,7 @@ int hum = 0;
 void setup()
 {
   Serial.begin(115200);
-
+  u8g2.setBusClock(100000);
   u8g2.begin();
   updateOLED();
 

examples/DIY_PRO_V3_7/DIY_PRO_V3_7.ino

@@ -0,0 +1,424 @@
+/*
+Important: This code is only for the DIY PRO PCB Version 3.7 that has a push button mounted.
+
+This is the code for the AirGradient DIY PRO Air Quality Sensor with an ESP8266 Microcontroller with the SGP40 TVOC module from AirGradient.
+
+It is a high quality sensor showing PM2.5, CO2, Temperature and Humidity on a small display and can send data over Wifi.
+
+Build Instructions: https://www.airgradient.com/open-airgradient/instructions/diy-pro-v37/
+
+Kits (including a pre-soldered version) are available: https://www.airgradient.com/open-airgradient/kits/
+
+The codes needs the following libraries installed:
+“WifiManager by tzapu, tablatronix” tested with version 2.0.11-beta
+“U8g2” by oliver tested with version 2.32.15
+"Sensirion I2C SGP41" by Sensation Version 0.1.0
+"Sensirion Gas Index Algorithm" by Sensation Version 3.2.1
+
+Configuration:
+Please set in the code below the configuration parameters.
+
+If you have any questions please visit our forum at https://forum.airgradient.com/
+
+If you are a school or university contact us for a free trial on the AirGradient platform.
+https://www.airgradient.com/
+
+CC BY-SA 4.0 Attribution-ShareAlike 4.0 International License
+
+*/
+
+
+#include <AirGradient.h>
+#include <WiFiManager.h>
+#include <ESP8266WiFi.h>
+#include <ESP8266HTTPClient.h>
+#include <WiFiClient.h>
+
+#include <EEPROM.h>
+
+//#include "SGP30.h"
+#include <SensirionI2CSgp41.h>
+#include <NOxGasIndexAlgorithm.h>
+#include <VOCGasIndexAlgorithm.h>
+
+
+#include <U8g2lib.h>
+
+AirGradient ag = AirGradient();
+SensirionI2CSgp41 sgp41;
+VOCGasIndexAlgorithm voc_algorithm;
+NOxGasIndexAlgorithm nox_algorithm;
+// time in seconds needed for NOx conditioning
+uint16_t conditioning_s = 10;
+
+// for peristent saving and loading
+int addr = 4;
+byte value;
+
+// Display bottom right
+U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);
+
+// Replace above if you have display on top left
+//U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R2, /* reset=*/ U8X8_PIN_NONE);
+
+
+// CONFIGURATION START
+
+//set to the endpoint you would like to use
+String APIROOT = "http://hw.airgradient.com/";
+
+// set to true to switch from Celcius to Fahrenheit
+boolean inF = false;
+
+// PM2.5 in US AQI (default ug/m3)
+boolean inUSAQI = false;
+
+// Display Position
+boolean displayTop = true;
+
+// set to true if you want to connect to wifi. You have 60 seconds to connect. Then it will go into an offline mode.
+boolean connectWIFI=true;
+
+// CONFIGURATION END
+
+
+unsigned long currentMillis = 0;
+
+const int oledInterval = 5000;
+unsigned long previousOled = 0;
+
+const int sendToServerInterval = 10000;
+unsigned long previoussendToServer = 0;
+
+const int tvocInterval = 1000;
+unsigned long previousTVOC = 0;
+int TVOC = 0;
+int NOX = 0;
+
+const int co2Interval = 5000;
+unsigned long previousCo2 = 0;
+int Co2 = 0;
+
+const int pm25Interval = 5000;
+unsigned long previousPm25 = 0;
+int pm25 = 0;
+
+const int tempHumInterval = 2500;
+unsigned long previousTempHum = 0;
+float temp = 0;
+int hum = 0;
+
+int buttonConfig=4;
+int lastState = LOW;
+int currentState;
+unsigned long pressedTime  = 0;
+unsigned long releasedTime = 0;
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println("Hello");
+  u8g2.begin();
+  //u8g2.setDisplayRotation(U8G2_R0);
+
+  EEPROM.begin(512);
+  delay(500);
+
+  buttonConfig = String(EEPROM.read(addr)).toInt();
+  setConfig();
+
+   updateOLED2("Press Button", "Now for", "Config Menu");
+    delay(2000);
+
+  currentState = digitalRead(D7);
+  if (currentState == HIGH)
+  {
+    updateOLED2("Entering", "Config Menu", "");
+    delay(3000);
+    lastState = LOW;
+    inConf();
+  }
+
+  if (connectWIFI)
+  {
+     connectToWifi();
+  }
+
+  updateOLED2("Warming Up", "Serial Number:", String(ESP.getChipId(), HEX));
+  sgp41.begin(Wire);
+  ag.CO2_Init();
+  ag.PMS_Init();
+  ag.TMP_RH_Init(0x44);
+}
+
+void loop() {
+  currentMillis = millis();
+  updateTVOC();
+  updateOLED();
+  updateCo2();
+  updatePm25();
+  updateTempHum();
+  sendToServer();
+}
+
+void inConf(){
+  setConfig();
+  currentState = digitalRead(D7);
+
+  if(lastState == LOW && currentState == HIGH) {
+    pressedTime = millis();
+  }
+
+  else if(lastState == HIGH && currentState == LOW) {
+    releasedTime = millis();
+    long pressDuration = releasedTime - pressedTime;
+    if( pressDuration < 1000 ) {
+      buttonConfig=buttonConfig+1;
+      if (buttonConfig>7) buttonConfig=0;
+    }
+  }
+
+  if (lastState == HIGH && currentState == HIGH){
+     long passedDuration = millis() - pressedTime;
+      if( passedDuration > 4000 ) {
+        // to do
+//        if (buttonConfig==4) {
+//          updateOLED2("Saved", "Release", "Button Now");
+//          delay(1000);
+//          updateOLED2("Starting", "CO2", "Calibration");
+//          delay(1000);
+//          Co2Calibration();
+//       } else {
+          updateOLED2("Saved", "Release", "Button Now");
+          delay(1000);
+          updateOLED2("Rebooting", "in", "5 seconds");
+          delay(5000);
+          EEPROM.write(addr, char(buttonConfig));
+          EEPROM.commit();
+          delay(1000);
+          ESP.restart();
+ //       }
+    }
+
+  }
+  lastState = currentState;
+  delay(100);
+  inConf();
+}
+
+
+void setConfig() {
+  if (buttonConfig == 0) {
+    updateOLED2("Temp. in C", "PM in ug/m3", "Display Top");
+      u8g2.setDisplayRotation(U8G2_R2);
+      inF = false;
+      inUSAQI = false;
+  }
+    if (buttonConfig == 1) {
+    updateOLED2("Temp. in C", "PM in US AQI", "Display Top");
+      u8g2.setDisplayRotation(U8G2_R2);
+      inF = false;
+      inUSAQI = true;
+  }
+   if (buttonConfig == 2) {
+    updateOLED2("Temp. in F", "PM in ug/m3", "Display Top");
+      u8g2.setDisplayRotation(U8G2_R2);
+      inF = true;
+      inUSAQI = false;
+  }
+   if (buttonConfig == 3) {
+    updateOLED2("Temp. in F", "PM in US AQI", "Display Top");
+      u8g2.setDisplayRotation(U8G2_R2);
+       inF = true;
+      inUSAQI = true;
+  }
+    if (buttonConfig == 4) {
+    updateOLED2("Temp. in C", "PM in ug/m3", "Display Bottom");
+      u8g2.setDisplayRotation(U8G2_R0);
+      inF = false;
+      inUSAQI = false;
+  }
+    if (buttonConfig == 5) {
+    updateOLED2("Temp. in C", "PM in US AQI", "Display Bottom");
+      u8g2.setDisplayRotation(U8G2_R0);
+      inF = false;
+      inUSAQI = true;
+  }
+   if (buttonConfig == 6) {
+    updateOLED2("Temp. in F", "PM in ug/m3", "Display Bottom");
+    u8g2.setDisplayRotation(U8G2_R0);
+      inF = true;
+      inUSAQI = false;
+  }
+   if (buttonConfig == 7) {
+    updateOLED2("Temp. in F", "PM in US AQI", "Display Bottom");
+      u8g2.setDisplayRotation(U8G2_R0);
+       inF = true;
+      inUSAQI = true;
+  }
+
+
+
+  // to do
+  // if (buttonConfig == 8) {
+  //  updateOLED2("CO2", "Manual", "Calibration");
+  // }
+}
+
+void updateTVOC()
+{
+ uint16_t error;
+    char errorMessage[256];
+    uint16_t defaultRh = 0x8000;
+    uint16_t defaultT = 0x6666;
+    uint16_t srawVoc = 0;
+    uint16_t srawNox = 0;
+    uint16_t defaultCompenstaionRh = 0x8000;  // in ticks as defined by SGP41
+    uint16_t defaultCompenstaionT = 0x6666;   // in ticks as defined by SGP41
+    uint16_t compensationRh = 0;              // in ticks as defined by SGP41
+    uint16_t compensationT = 0;               // in ticks as defined by SGP41
+
+    delay(1000);
+
+    compensationT = static_cast<uint16_t>((temp + 45) * 65535 / 175);
+    compensationRh = static_cast<uint16_t>(hum * 65535 / 100);
+
+    if (conditioning_s > 0) {
+        error = sgp41.executeConditioning(compensationRh, compensationT, srawVoc);
+        conditioning_s--;
+    } else {
+        error = sgp41.measureRawSignals(compensationRh, compensationT, srawVoc,
+                                        srawNox);
+    }
+
+    if (currentMillis - previousTVOC >= tvocInterval) {
+      previousTVOC += tvocInterval;
+      TVOC = voc_algorithm.process(srawVoc);
+      NOX = nox_algorithm.process(srawNox);
+      Serial.println(String(TVOC));
+    }
+}
+
+void updateCo2()
+{
+    if (currentMillis - previousCo2 >= co2Interval) {
+      previousCo2 += co2Interval;
+      Co2 = ag.getCO2_Raw();
+      Serial.println(String(Co2));
+    }
+}
+
+void updatePm25()
+{
+    if (currentMillis - previousPm25 >= pm25Interval) {
+      previousPm25 += pm25Interval;
+      pm25 = ag.getPM2_Raw();
+      Serial.println(String(pm25));
+    }
+}
+
+void updateTempHum()
+{
+    if (currentMillis - previousTempHum >= tempHumInterval) {
+      previousTempHum += tempHumInterval;
+      TMP_RH result = ag.periodicFetchData();
+      temp = result.t;
+      hum = result.rh;
+      Serial.println(String(temp));
+    }
+}
+
+void updateOLED() {
+   if (currentMillis - previousOled >= oledInterval) {
+     previousOled += oledInterval;
+
+    String ln3;
+    String ln1;
+
+    if (inUSAQI) {
+      ln1 = "AQI:" + String(PM_TO_AQI_US(pm25)) +  " CO2:" + String(Co2);
+    } else {
+      ln1 = "PM:" + String(pm25) +  " CO2:" + String(Co2);
+    }
+
+     String ln2 = "TVOC:" + String(TVOC) + " NOX:" + String(NOX);
+
+      if (inF) {
+        ln3 = "F:" + String((temp* 9 / 5) + 32) + " H:" + String(hum)+"%";
+        } else {
+        ln3 = "C:" + String(temp) + " H:" + String(hum)+"%";
+       }
+     updateOLED2(ln1, ln2, ln3);
+   }
+}
+
+void updateOLED2(String ln1, String ln2, String ln3) {
+  char buf[9];
+  u8g2.firstPage();
+  u8g2.firstPage();
+  do {
+  u8g2.setFont(u8g2_font_t0_16_tf);
+  u8g2.drawStr(1, 10, String(ln1).c_str());
+  u8g2.drawStr(1, 30, String(ln2).c_str());
+  u8g2.drawStr(1, 50, String(ln3).c_str());
+    } while ( u8g2.nextPage() );
+}
+
+void sendToServer() {
+   if (currentMillis - previoussendToServer >= sendToServerInterval) {
+     previoussendToServer += sendToServerInterval;
+      String payload = "{\"wifi\":" + String(WiFi.RSSI())
+      + (Co2 < 0 ? "" : ", \"rco2\":" + String(Co2))
+      + (pm25 < 0 ? "" : ", \"pm02\":" + String(pm25))
+      + (TVOC < 0 ? "" : ", \"tvoc_index\":" + String(TVOC))
+      + (NOX < 0 ? "" : ", \"nox_index\":" + String(NOX))
+      + ", \"atmp\":" + String(temp)
+      + (hum < 0 ? "" : ", \"rhum\":" + String(hum))
+      + "}";
+
+      if(WiFi.status()== WL_CONNECTED){
+        Serial.println(payload);
+        String POSTURL = APIROOT + "sensors/airgradient:" + String(ESP.getChipId(), HEX) + "/measures";
+        Serial.println(POSTURL);
+        WiFiClient client;
+        HTTPClient http;
+        http.begin(client, POSTURL);
+        http.addHeader("content-type", "application/json");
+        int httpCode = http.POST(payload);
+        String response = http.getString();
+        Serial.println(httpCode);
+        Serial.println(response);
+        http.end();
+      }
+      else {
+        Serial.println("WiFi Disconnected");
+      }
+   }
+}
+
+// Wifi Manager
+ void connectToWifi() {
+   WiFiManager wifiManager;
+   //WiFi.disconnect(); //to delete previous saved hotspot
+   String HOTSPOT = "AG-" + String(ESP.getChipId(), HEX);
+   updateOLED2("90s to connect", "to Wifi Hotspot", HOTSPOT);
+   wifiManager.setTimeout(90);
+
+   if (!wifiManager.autoConnect((const char * ) HOTSPOT.c_str())) {
+     updateOLED2("booting into", "offline mode", "");
+     Serial.println("failed to connect and hit timeout");
+     delay(6000);
+   }
+
+}
+
+// Calculate PM2.5 US AQI
+int PM_TO_AQI_US(int pm02) {
+  if (pm02 <= 12.0) return ((50 - 0) / (12.0 - .0) * (pm02 - .0) + 0);
+  else if (pm02 <= 35.4) return ((100 - 50) / (35.4 - 12.0) * (pm02 - 12.0) + 50);
+  else if (pm02 <= 55.4) return ((150 - 100) / (55.4 - 35.4) * (pm02 - 35.4) + 100);
+  else if (pm02 <= 150.4) return ((200 - 150) / (150.4 - 55.4) * (pm02 - 55.4) + 150);
+  else if (pm02 <= 250.4) return ((300 - 200) / (250.4 - 150.4) * (pm02 - 150.4) + 200);
+  else if (pm02 <= 350.4) return ((400 - 300) / (350.4 - 250.4) * (pm02 - 250.4) + 300);
+  else if (pm02 <= 500.4) return ((500 - 400) / (500.4 - 350.4) * (pm02 - 350.4) + 400);
+  else return 500;
+};

examples/DIY_PRO_V4_2/DIY_PRO_V4_2.ino

@@ -0,0 +1,424 @@
+/*
+Important: This code is only for the DIY PRO PCB Version 3.7 that has a push button mounted.
+
+This is the code for the AirGradient DIY PRO Air Quality Sensor with an ESP8266 Microcontroller with the SGP40 TVOC module from AirGradient.
+
+It is a high quality sensor showing PM2.5, CO2, Temperature and Humidity on a small display and can send data over Wifi.
+
+Build Instructions: https://www.airgradient.com/open-airgradient/instructions/diy-pro-v37/
+
+Kits (including a pre-soldered version) are available: https://www.airgradient.com/open-airgradient/kits/
+
+The codes needs the following libraries installed:
+“WifiManager by tzapu, tablatronix” tested with version 2.0.11-beta
+“U8g2” by oliver tested with version 2.32.15
+"Sensirion I2C SGP41" by Sensation Version 0.1.0
+"Sensirion Gas Index Algorithm" by Sensation Version 3.2.1
+"Arduino-SHT" by Johannes Winkelmann Version 1.2.2
+
+Configuration:
+Please set in the code below the configuration parameters.
+
+If you have any questions please visit our forum at https://forum.airgradient.com/
+
+If you are a school or university contact us for a free trial on the AirGradient platform.
+https://www.airgradient.com/
+
+CC BY-SA 4.0 Attribution-ShareAlike 4.0 International License
+
+*/
+
+
+#include <AirGradient.h>
+#include <WiFiManager.h>
+#include <ESP8266WiFi.h>
+#include <ESP8266HTTPClient.h>
+#include <WiFiClient.h>
+
+#include <EEPROM.h>
+#include "SHTSensor.h"
+
+//#include "SGP30.h"
+#include <SensirionI2CSgp41.h>
+#include <NOxGasIndexAlgorithm.h>
+#include <VOCGasIndexAlgorithm.h>
+
+
+#include <U8g2lib.h>
+
+AirGradient ag = AirGradient();
+SensirionI2CSgp41 sgp41;
+VOCGasIndexAlgorithm voc_algorithm;
+NOxGasIndexAlgorithm nox_algorithm;
+SHTSensor sht;
+
+// time in seconds needed for NOx conditioning
+uint16_t conditioning_s = 10;
+
+// for peristent saving and loading
+int addr = 4;
+byte value;
+
+// Display bottom right
+U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);
+
+// Replace above if you have display on top left
+//U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R2, /* reset=*/ U8X8_PIN_NONE);
+
+
+// CONFIGURATION START
+
+//set to the endpoint you would like to use
+String APIROOT = "http://hw.airgradient.com/";
+
+// set to true to switch from Celcius to Fahrenheit
+boolean inF = false;
+
+// PM2.5 in US AQI (default ug/m3)
+boolean inUSAQI = false;
+
+// Display Position
+boolean displayTop = true;
+
+// set to true if you want to connect to wifi. You have 60 seconds to connect. Then it will go into an offline mode.
+boolean connectWIFI=true;
+
+// CONFIGURATION END
+
+
+unsigned long currentMillis = 0;
+
+const int oledInterval = 5000;
+unsigned long previousOled = 0;
+
+const int sendToServerInterval = 10000;
+unsigned long previoussendToServer = 0;
+
+const int tvocInterval = 1000;
+unsigned long previousTVOC = 0;
+int TVOC = 0;
+int NOX = 0;
+
+const int co2Interval = 5000;
+unsigned long previousCo2 = 0;
+int Co2 = 0;
+
+const int pm25Interval = 5000;
+unsigned long previousPm25 = 0;
+int pm25 = 0;
+
+const int tempHumInterval = 2500;
+unsigned long previousTempHum = 0;
+float temp = 0;
+int hum = 0;
+
+int buttonConfig=0;
+int lastState = LOW;
+int currentState;
+unsigned long pressedTime  = 0;
+unsigned long releasedTime = 0;
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println("Hello");
+  u8g2.begin();
+  sht.init();
+  sht.setAccuracy(SHTSensor::SHT_ACCURACY_MEDIUM);
+  //u8g2.setDisplayRotation(U8G2_R0);
+
+  EEPROM.begin(512);
+  delay(500);
+
+  buttonConfig = String(EEPROM.read(addr)).toInt();
+  if (buttonConfig>3) buttonConfig=0;
+  delay(400);
+  setConfig();
+  Serial.println("buttonConfig: "+String(buttonConfig));
+   updateOLED2("Press Button", "Now for", "Config Menu");
+    delay(2000);
+  pinMode(D7, INPUT_PULLUP);
+  currentState = digitalRead(D7);
+  if (currentState == LOW)
+  {
+    updateOLED2("Entering", "Config Menu", "");
+    delay(3000);
+    lastState = HIGH;
+    setConfig();
+    inConf();
+  }
+
+  if (connectWIFI)
+  {
+     connectToWifi();
+  }
+
+  updateOLED2("Warming Up", "Serial Number:", String(ESP.getChipId(), HEX));
+  sgp41.begin(Wire);
+  ag.CO2_Init();
+  ag.PMS_Init();
+  ag.TMP_RH_Init(0x44);
+}
+
+void loop() {
+  currentMillis = millis();
+  updateTVOC();
+  updateOLED();
+  updateCo2();
+  updatePm25();
+  updateTempHum();
+  sendToServer();
+}
+
+void inConf(){
+  setConfig();
+  currentState = digitalRead(D7);
+
+  if (currentState){
+    Serial.println("currentState: high");
+  } else {
+    Serial.println("currentState: low");
+  }
+
+  if(lastState == HIGH && currentState == LOW) {
+    pressedTime = millis();
+  }
+
+  else if(lastState == LOW && currentState == HIGH) {
+    releasedTime = millis();
+    long pressDuration = releasedTime - pressedTime;
+    if( pressDuration < 1000 ) {
+      buttonConfig=buttonConfig+1;
+      if (buttonConfig>3) buttonConfig=0;
+    }
+  }
+
+  if (lastState == LOW && currentState == LOW){
+     long passedDuration = millis() - pressedTime;
+      if( passedDuration > 4000 ) {
+        // to do
+//        if (buttonConfig==4) {
+//          updateOLED2("Saved", "Release", "Button Now");
+//          delay(1000);
+//          updateOLED2("Starting", "CO2", "Calibration");
+//          delay(1000);
+//          Co2Calibration();
+//       } else {
+          updateOLED2("Saved", "Release", "Button Now");
+          delay(1000);
+          updateOLED2("Rebooting", "in", "5 seconds");
+          delay(5000);
+          EEPROM.write(addr, char(buttonConfig));
+          EEPROM.commit();
+          delay(1000);
+          ESP.restart();
+ //       }
+    }
+
+  }
+  lastState = currentState;
+  delay(100);
+  inConf();
+}
+
+
+void setConfig() {
+  if (buttonConfig == 0) {
+    updateOLED2("Temp. in C", "PM in ug/m3", "Long Press Saves");
+      u8g2.setDisplayRotation(U8G2_R0);
+      inF = false;
+      inUSAQI = false;
+  }
+    if (buttonConfig == 1) {
+    updateOLED2("Temp. in C", "PM in US AQI", "Long Press Saves");
+      u8g2.setDisplayRotation(U8G2_R0);
+      inF = false;
+      inUSAQI = true;
+  } else if (buttonConfig == 2) {
+    updateOLED2("Temp. in F", "PM in ug/m3", "Long Press Saves");
+    u8g2.setDisplayRotation(U8G2_R0);
+      inF = true;
+      inUSAQI = false;
+  } else  if (buttonConfig == 3) {
+    updateOLED2("Temp. in F", "PM in US AQI", "Long Press Saves");
+      u8g2.setDisplayRotation(U8G2_R0);
+       inF = true;
+      inUSAQI = true;
+  }
+
+
+
+  // to do
+  // if (buttonConfig == 8) {
+  //  updateOLED2("CO2", "Manual", "Calibration");
+  // }
+}
+
+void updateTVOC()
+{
+ uint16_t error;
+    char errorMessage[256];
+    uint16_t defaultRh = 0x8000;
+    uint16_t defaultT = 0x6666;
+    uint16_t srawVoc = 0;
+    uint16_t srawNox = 0;
+    uint16_t defaultCompenstaionRh = 0x8000;  // in ticks as defined by SGP41
+    uint16_t defaultCompenstaionT = 0x6666;   // in ticks as defined by SGP41
+    uint16_t compensationRh = 0;              // in ticks as defined by SGP41
+    uint16_t compensationT = 0;               // in ticks as defined by SGP41
+
+    delay(1000);
+
+    compensationT = static_cast<uint16_t>((temp + 45) * 65535 / 175);
+    compensationRh = static_cast<uint16_t>(hum * 65535 / 100);
+
+    if (conditioning_s > 0) {
+        error = sgp41.executeConditioning(compensationRh, compensationT, srawVoc);
+        conditioning_s--;
+    } else {
+        error = sgp41.measureRawSignals(compensationRh, compensationT, srawVoc,
+                                        srawNox);
+    }
+
+    if (currentMillis - previousTVOC >= tvocInterval) {
+      previousTVOC += tvocInterval;
+      TVOC = voc_algorithm.process(srawVoc);
+      NOX = nox_algorithm.process(srawNox);
+      Serial.println(String(TVOC));
+    }
+}
+
+void updateCo2()
+{
+    if (currentMillis - previousCo2 >= co2Interval) {
+      previousCo2 += co2Interval;
+      Co2 = ag.getCO2_Raw();
+      Serial.println(String(Co2));
+    }
+}
+
+void updatePm25()
+{
+    if (currentMillis - previousPm25 >= pm25Interval) {
+      previousPm25 += pm25Interval;
+      pm25 = ag.getPM2_Raw();
+      Serial.println(String(pm25));
+    }
+}
+
+void updateTempHum()
+{
+    if (currentMillis - previousTempHum >= tempHumInterval) {
+      previousTempHum += tempHumInterval;
+
+      if (sht.readSample()) {
+      Serial.print("SHT:\n");
+      Serial.print("  RH: ");
+      Serial.print(sht.getHumidity(), 2);
+      Serial.print("\n");
+      Serial.print("  T:  ");
+      Serial.print(sht.getTemperature(), 2);
+      Serial.print("\n");
+      temp = sht.getTemperature();
+      hum = sht.getHumidity();
+  } else {
+      Serial.print("Error in readSample()\n");
+  }
+      Serial.println(String(temp));
+    }
+}
+
+void updateOLED() {
+   if (currentMillis - previousOled >= oledInterval) {
+     previousOled += oledInterval;
+
+    String ln3;
+    String ln1;
+
+    if (inUSAQI) {
+      ln1 = "AQI:" + String(PM_TO_AQI_US(pm25)) +  " CO2:" + String(Co2);
+    } else {
+      ln1 = "PM:" + String(pm25) +  " CO2:" + String(Co2);
+    }
+
+     String ln2 = "TVOC:" + String(TVOC) + " NOX:" + String(NOX);
+
+      if (inF) {
+        ln3 = "F:" + String((temp* 9 / 5) + 32) + " H:" + String(hum)+"%";
+        } else {
+        ln3 = "C:" + String(temp) + " H:" + String(hum)+"%";
+       }
+     updateOLED2(ln1, ln2, ln3);
+   }
+}
+
+void updateOLED2(String ln1, String ln2, String ln3) {
+  char buf[9];
+  u8g2.firstPage();
+  u8g2.firstPage();
+  do {
+  u8g2.setFont(u8g2_font_t0_16_tf);
+  u8g2.drawStr(1, 10, String(ln1).c_str());
+  u8g2.drawStr(1, 30, String(ln2).c_str());
+  u8g2.drawStr(1, 50, String(ln3).c_str());
+    } while ( u8g2.nextPage() );
+}
+
+void sendToServer() {
+   if (currentMillis - previoussendToServer >= sendToServerInterval) {
+     previoussendToServer += sendToServerInterval;
+      String payload = "{\"wifi\":" + String(WiFi.RSSI())
+      + (Co2 < 0 ? "" : ", \"rco2\":" + String(Co2))
+      + (pm25 < 0 ? "" : ", \"pm02\":" + String(pm25))
+      + (TVOC < 0 ? "" : ", \"tvoc_index\":" + String(TVOC))
+      + (NOX < 0 ? "" : ", \"nox_index\":" + String(NOX))
+      + ", \"atmp\":" + String(temp)
+      + (hum < 0 ? "" : ", \"rhum\":" + String(hum))
+      + "}";
+
+      if(WiFi.status()== WL_CONNECTED){
+        Serial.println(payload);
+        String POSTURL = APIROOT + "sensors/airgradient:" + String(ESP.getChipId(), HEX) + "/measures";
+        Serial.println(POSTURL);
+        WiFiClient client;
+        HTTPClient http;
+        http.begin(client, POSTURL);
+        http.addHeader("content-type", "application/json");
+        int httpCode = http.POST(payload);
+        String response = http.getString();
+        Serial.println(httpCode);
+        Serial.println(response);
+        http.end();
+      }
+      else {
+        Serial.println("WiFi Disconnected");
+      }
+   }
+}
+
+// Wifi Manager
+ void connectToWifi() {
+   WiFiManager wifiManager;
+   //WiFi.disconnect(); //to delete previous saved hotspot
+   String HOTSPOT = "AG-" + String(ESP.getChipId(), HEX);
+   updateOLED2("90s to connect", "to Wifi Hotspot", HOTSPOT);
+   wifiManager.setTimeout(90);
+
+   if (!wifiManager.autoConnect((const char * ) HOTSPOT.c_str())) {
+     updateOLED2("booting into", "offline mode", "");
+     Serial.println("failed to connect and hit timeout");
+     delay(6000);
+   }
+
+}
+
+// Calculate PM2.5 US AQI
+int PM_TO_AQI_US(int pm02) {
+  if (pm02 <= 12.0) return ((50 - 0) / (12.0 - .0) * (pm02 - .0) + 0);
+  else if (pm02 <= 35.4) return ((100 - 50) / (35.4 - 12.0) * (pm02 - 12.0) + 50);
+  else if (pm02 <= 55.4) return ((150 - 100) / (55.4 - 35.4) * (pm02 - 35.4) + 100);
+  else if (pm02 <= 150.4) return ((200 - 150) / (150.4 - 55.4) * (pm02 - 55.4) + 150);
+  else if (pm02 <= 250.4) return ((300 - 200) / (250.4 - 150.4) * (pm02 - 150.4) + 200);
+  else if (pm02 <= 350.4) return ((400 - 300) / (350.4 - 250.4) * (pm02 - 250.4) + 300);
+  else if (pm02 <= 500.4) return ((500 - 400) / (500.4 - 350.4) * (pm02 - 350.4) + 400);
+  else return 500;
+};

examples/DIY_PRO_WITH_SGP30/DIY_PRO_WITH_SGP30.ino

@@ -1,248 +0,0 @@
-/*
-This is the code for the AirGradient DIY PRO Air Quality Sensor with an ESP8266 Microcontroller.
-
-It is a high quality sensor showing PM2.5, CO2, Temperature and Humidity on a small display and can send data over Wifi.
-
-Build Instructions: https://www.airgradient.com/open-airgradient/instructions/diy-pro/
-
-Kits (including a pre-soldered version) are available: https://www.airgradient.com/open-airgradient/kits/
-
-IMPORTANT: If you use SGP30 modules, you need to remove the Pull up resistors to make it work.
-See https://www.airgradient.com/open-airgradient/instructions/tvoc-on-airgradient-diy-sensor/
-
-If you want to use TVOC we strongly recommend you use the AirGradient SGP4x module available in our online shop.
-
-The codes needs the following libraries installed:
-“WifiManager by tzapu, tablatronix” tested with version 2.0.11-beta
-“U8g2” by oliver tested with version 2.32.15
-“SGP30” by Rob Tilaart tested with Version 0.1.5
-
-Configuration:
-Please set in the code below the configuration parameters.
-
-If you have any questions please visit our forum at https://forum.airgradient.com/
-
-If you are a school or university contact us for a free trial on the AirGradient platform.
-https://www.airgradient.com/
-
-MIT License
-
-*/
-
-
-#include <AirGradient.h>
-#include <WiFiManager.h>
-#include <ESP8266WiFi.h>
-#include <ESP8266HTTPClient.h>
-#include <WiFiClient.h>
-
-#include "SGP30.h"
-#include <U8g2lib.h>
-
-AirGradient ag = AirGradient();
-SGP30 SGP;
-
-// Display bottom right
-U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);
-
-// Replace above if you have display on top left
-//U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R2, /* reset=*/ U8X8_PIN_NONE);
-
-
-// CONFIGURATION START
-
-//set to the endpoint you would like to use
-String APIROOT = "http://hw.airgradient.com/";
-
-// set to true to switch from Celcius to Fahrenheit
-boolean inF = false;
-
-// set to true if you want to connect to wifi. You have 60 seconds to connect. Then it will go into an offline mode.
-boolean connectWIFI=true;
-
-// CONFIGURATION END
-
-
-unsigned long currentMillis = 0;
-
-const int oledInterval = 5000;
-unsigned long previousOled = 0;
-
-const int sendToServerInterval = 10000;
-unsigned long previoussendToServer = 0;
-
-const int tvocInterval = 1000;
-unsigned long previousTVOC = 0;
-int TVOC = 0;
-
-const int co2Interval = 5000;
-unsigned long previousCo2 = 0;
-int Co2 = 0;
-
-const int pm25Interval = 5000;
-unsigned long previousPm25 = 0;
-int pm25 = 0;
-
-const int tempHumInterval = 2500;
-unsigned long previousTempHum = 0;
-float temp = 0;
-int hum = 0;
-
-void setup()
-{
-  Serial.begin(115200);
-
-  u8g2.begin();
-  updateOLED();
-
-    if (connectWIFI) {
-    connectToWifi();
-  }
-
-  updateOLED2("Warming up the", "sensors.", "");
-
-  Serial.println(SGP.begin());
-  SGP.GenericReset();
-
-  ag.CO2_Init();
-  ag.PMS_Init();
-  ag.TMP_RH_Init(0x44);
-}
-
-
-void loop()
-{
-  currentMillis = millis();
-  updateTVOC();
-  updateOLED();
-  updateCo2();
-  updatePm25();
-  updateTempHum();
-  sendToServer();
-}
-
-void updateTVOC()
-{
-    if (currentMillis - previousTVOC >= tvocInterval) {
-      previousTVOC += tvocInterval;
-      SGP.measure(true);
-      TVOC = SGP.getTVOC();
-      Serial.println(String(TVOC));
-    }
-}
-
-void updateCo2()
-{
-    if (currentMillis - previousCo2 >= co2Interval) {
-      previousCo2 += co2Interval;
-      Co2 = ag.getCO2_Raw();
-      Serial.println(String(Co2));
-    }
-}
-
-void updatePm25()
-{
-    if (currentMillis - previousPm25 >= pm25Interval) {
-      previousPm25 += pm25Interval;
-      pm25 = ag.getPM2_Raw();
-      Serial.println(String(pm25));
-    }
-}
-
-void updateTempHum()
-{
-    if (currentMillis - previousTempHum >= tempHumInterval) {
-      previousTempHum += tempHumInterval;
-      TMP_RH result = ag.periodicFetchData();
-      temp = result.t;
-      hum = result.rh;
-      Serial.println(String(temp));
-    }
-}
-
-void updateOLED() {
-   if (currentMillis - previousOled >= oledInterval) {
-     previousOled += oledInterval;
-
-    String ln3;
-    String ln1 = "PM:" + String(pm25) +  " CO2:" + String(Co2);
-    String ln2 = "AQI:" + String(PM_TO_AQI_US(pm25)) + " TVOC:" + String(TVOC);
-
-      if (inF) {
-        ln3 = "F:" + String((temp* 9 / 5) + 32) + " H:" + String(hum)+"%";
-        } else {
-        ln3 = "C:" + String(temp) + " H:" + String(hum)+"%";
-       }
-     updateOLED2(ln1, ln2, ln3);
-   }
-}
-
-void updateOLED2(String ln1, String ln2, String ln3) {
-      char buf[9];
-          u8g2.firstPage();
-          u8g2.firstPage();
-          do {
-          u8g2.setFont(u8g2_font_t0_16_tf);
-          u8g2.drawStr(1, 10, String(ln1).c_str());
-          u8g2.drawStr(1, 30, String(ln2).c_str());
-          u8g2.drawStr(1, 50, String(ln3).c_str());
-            } while ( u8g2.nextPage() );
-}
-
-void sendToServer() {
-   if (currentMillis - previoussendToServer >= sendToServerInterval) {
-     previoussendToServer += sendToServerInterval;
-
-      String payload = "{\"wifi\":" + String(WiFi.RSSI())
-      + (Co2 < 0 ? "" : ", \"rco2\":" + String(Co2))
-      + (pm25 < 0 ? "" : ", \"pm02\":" + String(pm25))
-      + (TVOC < 0 ? "" : ", \"tvoc\":" + String(TVOC))
-      + ", \"atmp\":" + String(temp)
-      + (hum < 0 ? "" : ", \"rhum\":" + String(hum))
-      + "}";
-
-      if(WiFi.status()== WL_CONNECTED){
-        Serial.println(payload);
-        String POSTURL = APIROOT + "sensors/airgradient:" + String(ESP.getChipId(), HEX) + "/measures";
-        Serial.println(POSTURL);
-        WiFiClient client;
-        HTTPClient http;
-        http.begin(client, POSTURL);
-        http.addHeader("content-type", "application/json");
-        int httpCode = http.POST(payload);
-        String response = http.getString();
-        Serial.println(httpCode);
-        Serial.println(response);
-        http.end();
-      }
-      else {
-        Serial.println("WiFi Disconnected");
-      }
-   }
-}
-
-// Wifi Manager
- void connectToWifi() {
-   WiFiManager wifiManager;
-   //WiFi.disconnect(); //to delete previous saved hotspot
-   String HOTSPOT = "AG-" + String(ESP.getChipId(), HEX);
-   updateOLED2("60s to connect", "to Wifi Hotspot", HOTSPOT);
-   wifiManager.setTimeout(60);
-   if (!wifiManager.autoConnect((const char * ) HOTSPOT.c_str())) {
-     updateOLED2("booting into", "offline mode", "");
-     Serial.println("failed to connect and hit timeout");
-     delay(6000);
-   }
-}
-
-// Calculate PM2.5 US AQI
-int PM_TO_AQI_US(int pm02) {
-  if (pm02 <= 12.0) return ((50 - 0) / (12.0 - .0) * (pm02 - .0) + 0);
-  else if (pm02 <= 35.4) return ((100 - 50) / (35.4 - 12.0) * (pm02 - 12.0) + 50);
-  else if (pm02 <= 55.4) return ((150 - 100) / (55.4 - 35.4) * (pm02 - 35.4) + 100);
-  else if (pm02 <= 150.4) return ((200 - 150) / (150.4 - 55.4) * (pm02 - 55.4) + 150);
-  else if (pm02 <= 250.4) return ((300 - 200) / (250.4 - 150.4) * (pm02 - 150.4) + 200);
-  else if (pm02 <= 350.4) return ((400 - 300) / (350.4 - 250.4) * (pm02 - 250.4) + 300);
-  else if (pm02 <= 500.4) return ((500 - 400) / (500.4 - 350.4) * (pm02 - 350.4) + 400);
-  else return 500;
-};

examples/DIY_PRO_WITH_SGP40/DIY_PRO_WITH_SGP40.ino

@@ -1,255 +0,0 @@
-/*
-This is the code for the AirGradient DIY PRO Air Quality Sensor with an ESP8266 Microcontroller with the SGP40 TVOC module from AirGradient.
-
-It is a high quality sensor showing PM2.5, CO2, Temperature and Humidity on a small display and can send data over Wifi.
-
-Build Instructions: https://www.airgradient.com/open-airgradient/instructions/diy-pro/
-
-Kits (including a pre-soldered version) are available: https://www.airgradient.com/open-airgradient/kits/
-
-The codes needs the following libraries installed:
-“WifiManager by tzapu, tablatronix” tested with version 2.0.11-beta
-“U8g2” by oliver tested with version 2.32.15
-“DFRobot_SGP40” by DFRobot tested with Version 1.0.3
-
-Configuration:
-Please set in the code below the configuration parameters.
-
-If you have any questions please visit our forum at https://forum.airgradient.com/
-
-If you are a school or university contact us for a free trial on the AirGradient platform.
-https://www.airgradient.com/
-
-MIT License
-
-*/
-
-
-#include <AirGradient.h>
-#include <WiFiManager.h>
-#include <ESP8266WiFi.h>
-#include <ESP8266HTTPClient.h>
-#include <WiFiClient.h>
-
-//#include "SGP30.h"
-#include <DFRobot_SGP40.h>
-#include <U8g2lib.h>
-
-AirGradient ag = AirGradient();
-DFRobot_SGP40    sgp40;
-
-// Display bottom right
-U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);
-
-// Replace above if you have display on top left
-//U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R2, /* reset=*/ U8X8_PIN_NONE);
-
-
-// CONFIGURATION START
-
-//set to the endpoint you would like to use
-String APIROOT = "http://hw.airgradient.com/";
-
-// set to true to switch from Celcius to Fahrenheit
-boolean inF = false;
-
-// set to true if you want to connect to wifi. You have 60 seconds to connect. Then it will go into an offline mode.
-boolean connectWIFI=true;
-
-// CONFIGURATION END
-
-
-unsigned long currentMillis = 0;
-
-const int oledInterval = 5000;
-unsigned long previousOled = 0;
-
-const int sendToServerInterval = 10000;
-unsigned long previoussendToServer = 0;
-
-const int tvocInterval = 1000;
-unsigned long previousTVOC = 0;
-int TVOC = 0;
-
-const int co2Interval = 5000;
-unsigned long previousCo2 = 0;
-int Co2 = 0;
-
-const int pm25Interval = 5000;
-unsigned long previousPm25 = 0;
-int pm25 = 0;
-
-const int tempHumInterval = 2500;
-unsigned long previousTempHum = 0;
-float temp = 0;
-int hum = 0;
-
-void setup()
-{
-  Serial.begin(115200);
-
-  u8g2.begin();
-  updateOLED();
-
-    if (connectWIFI) {
-    connectToWifi();
-  }
-
-  updateOLED2("Warming up the", "sensors.", "");
-  sgp40.begin();
-  ag.CO2_Init();
-  ag.PMS_Init();
-  ag.TMP_RH_Init(0x44);
-}
-
-
-void loop()
-{
-  currentMillis = millis();
-  updateTVOC();
-  updateOLED();
-  updateCo2();
-  updatePm25();
-  updateTempHum();
-  sendToServer();
-}
-
-void updateTVOC()
-{
-    if (currentMillis - previousTVOC >= tvocInterval) {
-      previousTVOC += tvocInterval;
-      TVOC = sgp40.getVoclndex();
-      Serial.println(String(TVOC));
-    }
-}
-
-void updateCo2()
-{
-    if (currentMillis - previousCo2 >= co2Interval) {
-      previousCo2 += co2Interval;
-      Co2 = ag.getCO2_Raw();
-      Serial.println(String(Co2));
-    }
-}
-
-void updatePm25()
-{
-    if (currentMillis - previousPm25 >= pm25Interval) {
-      previousPm25 += pm25Interval;
-      pm25 = ag.getPM2_Raw();
-      Serial.println(String(pm25));
-    }
-}
-
-void updateTempHum()
-{
-    if (currentMillis - previousTempHum >= tempHumInterval) {
-      previousTempHum += tempHumInterval;
-      TMP_RH result = ag.periodicFetchData();
-      temp = result.t;
-      hum = result.rh;
-      Serial.println(String(temp));
-    }
-}
-
-void updateOLED() {
-   if (currentMillis - previousOled >= oledInterval) {
-     previousOled += oledInterval;
-
-    String ln3;
-    String ln1 = "PM:" + String(pm25) +  " CO2:" + String(Co2);
-    String ln2 = "AQI:" + String(PM_TO_AQI_US(pm25)) + " TVOC:" + String(TVOC);
-
-      if (inF) {
-        ln3 = "F:" + String((temp* 9 / 5) + 32) + " H:" + String(hum)+"%";
-        } else {
-        ln3 = "C:" + String(temp) + " H:" + String(hum)+"%";
-       }
-     updateOLED2(ln1, ln2, ln3);
-   }
-}
-
-void updateOLED2(String ln1, String ln2, String ln3) {
-      char buf[9];
-          u8g2.firstPage();
-          u8g2.firstPage();
-          do {
-          u8g2.setFont(u8g2_font_t0_16_tf);
-          u8g2.drawStr(1, 10, String(ln1).c_str());
-          u8g2.drawStr(1, 30, String(ln2).c_str());
-          u8g2.drawStr(1, 50, String(ln3).c_str());
-            } while ( u8g2.nextPage() );
-}
-
-void sendToServer() {
-   if (currentMillis - previoussendToServer >= sendToServerInterval) {
-     previoussendToServer += sendToServerInterval;
-      String payload = "{\"wifi\":" + String(WiFi.RSSI())
-      + (Co2 < 0 ? "" : ", \"rco2\":" + String(Co2))
-      + (pm25 < 0 ? "" : ", \"pm02\":" + String(pm25))
-      + (TVOC < 0 ? "" : ", \"tvoc_index\":" + String(TVOC))
-      + ", \"atmp\":" + String(temp)
-      + (hum < 0 ? "" : ", \"rhum\":" + String(hum))
-      + "}";
-
-      if(WiFi.status()== WL_CONNECTED){
-        Serial.println(payload);
-        String POSTURL = APIROOT + "sensors/airgradient:" + String(ESP.getChipId(), HEX) + "/measures";
-        Serial.println(POSTURL);
-        WiFiClient client;
-        HTTPClient http;
-        http.begin(client, POSTURL);
-        http.addHeader("content-type", "application/json");
-        int httpCode = http.POST(payload);
-        String response = http.getString();
-        Serial.println(httpCode);
-        Serial.println(response);
-        http.end();
-      }
-      else {
-        Serial.println("WiFi Disconnected");
-      }
-   }
-}
-
-// Wifi Manager
- void connectToWifi() {
-   WiFiManager wifiManager;
-   //WiFi.disconnect(); //to delete previous saved hotspot
-   String HOTSPOT = "AG-" + String(ESP.getChipId(), HEX);
-   updateOLED2("60s to connect", "to Wifi Hotspot", HOTSPOT);
-   wifiManager.setTimeout(60);
-
-
-   WiFiManagerParameter custom_text("<p>This is just a text paragraph</p>");
-   wifiManager.addParameter(&custom_text);
-
-   WiFiManagerParameter parameter("parameterId", "Parameter Label", "default value", 40);
-   wifiManager.addParameter(&parameter);
-
-
-   Serial.println("Parameter 1:");
-   Serial.println(parameter.getValue());
-
-   if (!wifiManager.autoConnect((const char * ) HOTSPOT.c_str())) {
-     updateOLED2("booting into", "offline mode", "");
-     Serial.println("failed to connect and hit timeout");
-     delay(6000);
-   }
-
-   Serial.println("Parameter 2:");
-   Serial.println(parameter.getValue());
-
-}
-
-// Calculate PM2.5 US AQI
-int PM_TO_AQI_US(int pm02) {
-  if (pm02 <= 12.0) return ((50 - 0) / (12.0 - .0) * (pm02 - .0) + 0);
-  else if (pm02 <= 35.4) return ((100 - 50) / (35.4 - 12.0) * (pm02 - 12.0) + 50);
-  else if (pm02 <= 55.4) return ((150 - 100) / (55.4 - 35.4) * (pm02 - 35.4) + 100);
-  else if (pm02 <= 150.4) return ((200 - 150) / (150.4 - 55.4) * (pm02 - 55.4) + 150);
-  else if (pm02 <= 250.4) return ((300 - 200) / (250.4 - 150.4) * (pm02 - 150.4) + 200);
-  else if (pm02 <= 350.4) return ((400 - 300) / (350.4 - 250.4) * (pm02 - 250.4) + 300);
-  else if (pm02 <= 500.4) return ((500 - 400) / (500.4 - 350.4) * (pm02 - 350.4) + 400);
-  else return 500;
-};

examples/MINI_DISPLAY/MINI_DISPLAY.ino

@@ -10,7 +10,7 @@ The codes needs the following libraries installed:
 "WifiManager by tzapu, tablatronix" tested with Version 2.0.5-alpha
 "Adafruit_ILI9341" tested with Version 1.5.10
 "Adafruit GFX library" tested with Version 1.10.12 (often automatically installed with above ILI9341 library)
-"ArduinoJSON" by Benoit Blanchon tested with Version 6.18.5
+"ArduinoJSON" by Benoit Blanchon tested with Version 5.13.5
 
 Configuration:
 Please set in the code below (line 90-) if you want to display the PM2.5 values in US AQI and temperature in F.
@@ -21,7 +21,7 @@ If you have any questions please visit our forum at https://forum.airgradient.co
 If you are a school or university contact us for a free trial on the AirGradient platform.
 https://www.airgradient.com/
 
-MIT License
+CC BY-SA 4.0 Attribution-ShareAlike 4.0 International License
 */
 
 #include <WiFiManager.h>

examples/PM2_SIMPLE/PM2_SIMPLE.ino

@@ -17,7 +17,7 @@ https://www.airgradient.com/
 
 Kits with all required components are available at https://www.airgradient.com/open-airgradient/shop/
 
-MIT License
+CC BY-SA 4.0 Attribution-ShareAlike 4.0 International License
 */
 
 #include <AirGradient.h>

examples/SHT_SIMPLE/SHT_SIMPLE.ino

@@ -17,7 +17,7 @@ Kits with all required components are available at https://www.airgradient.com/o
 
 If you have any questions please visit our forum at https://forum.airgradient.com/
 
-MIT License
+CC BY-SA 4.0 Attribution-ShareAlike 4.0 International License
 */
 
 #include <AirGradient.h>

library.properties

@@ -1,5 +1,5 @@
 name=AirGradient Air Quality Sensor
-version=2.2.0
+version=2.4.3
 author=AirGradient <support@airgradient.com>
 maintainer=AirGradient <support@airgradient.com>
 sentence=ESP8266 library for an air quality sensor featuring PM2.5, CO2, Temperature, TVOC and Humidity with OLED display.