Updated indoor examples

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

@@ -85,9 +85,7 @@ void setup()
     if (connectWIFI) {
     connectToWifi();
   }
-
-  updateOLED2("Warming", "up the", "sensors");
-
+  updateOLED2("Warm Up", "Serial#", String(ESP.getChipId(), HEX));
   ag.CO2_Init();
   ag.PMS_Init();
   ag.TMP_RH_Init(0x44);
@@ -207,9 +205,9 @@ void sendToServer() {
    WiFiManager wifiManager;
    //WiFi.disconnect(); //to delete previous saved hotspot
    String HOTSPOT = "AG-" + String(ESP.getChipId(), HEX);
-   updateOLED2("Connect", "Wifi", HOTSPOT);
+   updateOLED2("Connect", "Wifi AG-", String(ESP.getChipId(), HEX));
    delay(2000);
-   wifiManager.setTimeout(60);
+   wifiManager.setTimeout(90);
    if (!wifiManager.autoConnect((const char * ) HOTSPOT.c_str())) {
      updateOLED2("Booting", "offline", "mode");
      Serial.println("failed to connect and hit timeout");

examples/DIY_OUTDOOR/DIY_OUTDOOR.ino

@@ -14,7 +14,7 @@ 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/
 
-License: CC BY-NC 4.0 Attribution-NonCommercial 4.0 International
+CC BY-SA 4.0 Attribution-ShareAlike 4.0 International License
 */
 
 #include "PMS.h"

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
 
 */
 

examples/DIY_PRO_V3_7/DIY_PRO_V3_7.ino

@@ -5,7 +5,7 @@ This is the code for the AirGradient DIY PRO Air Quality Sensor with an ESP8266
 
 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/
+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/
 
@@ -23,7 +23,7 @@ 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/
 
-License: CC BY-NC 4.0 Attribution-NonCommercial 4.0 International
+CC BY-SA 4.0 Attribution-ShareAlike 4.0 International License
 
 */
 
@@ -51,15 +51,15 @@ NOxGasIndexAlgorithm nox_algorithm;
 // time in seconds needed for NOx conditioning
 uint16_t conditioning_s = 10;
 
-// for persistent saving and loading
-int addr = 0;
+// 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);
+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);
+//U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R2, /* reset=*/ U8X8_PIN_NONE);
 
 
 // CONFIGURATION START
@@ -108,7 +108,7 @@ unsigned long previousTempHum = 0;
 float temp = 0;
 int hum = 0;
 
-int buttonConfig=0;
+int buttonConfig=4;
 int lastState = LOW;
 int currentState;
 unsigned long pressedTime  = 0;
@@ -117,7 +117,6 @@ unsigned long releasedTime = 0;
 void setup() {
   Serial.begin(115200);
   Serial.println("Hello");
-  u8g2.setBusClock(100000);
   u8g2.begin();
   //u8g2.setDisplayRotation(U8G2_R0);
 
@@ -144,7 +143,7 @@ void setup() {
      connectToWifi();
   }
 
-  updateOLED2("Warming up the", "sensors.", "");
+  updateOLED2("Warming Up", "Serial Number:", String(ESP.getChipId(), HEX));
   sgp41.begin(Wire);
   ag.CO2_Init();
   ag.PMS_Init();
@@ -256,6 +255,9 @@ void setConfig() {
        inF = true;
       inUSAQI = true;
   }
+
+
+
   // to do
   // if (buttonConfig == 8) {
   //  updateOLED2("CO2", "Manual", "Calibration");
@@ -398,19 +400,8 @@ void sendToServer() {
    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());
+   updateOLED2("90s to connect", "to Wifi Hotspot", HOTSPOT);
+   wifiManager.setTimeout(90);
 
    if (!wifiManager.autoConnect((const char * ) HOTSPOT.c_str())) {
      updateOLED2("booting into", "offline mode", "");
@@ -418,9 +409,6 @@ void sendToServer() {
      delay(6000);
    }
 
-   Serial.println("Parameter 2:");
-   Serial.println(parameter.getValue());
-
 }
 
 // Calculate PM2.5 US AQI

examples/DIY_PRO_V4_2/DIY_PRO_V4_2.ino

@@ -0,0 +1,418 @@
+/*
+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;
+  } else if (buttonConfig == 1) {
+    updateOLED2("Temp. in C", "PM in US AQI", "Display Top");
+      u8g2.setDisplayRotation(U8G2_R2);
+      inF = false;
+      inUSAQI = true;
+  } else if (buttonConfig == 2) {
+    updateOLED2("Temp. in F", "PM in ug/m3", "Display Top");
+      u8g2.setDisplayRotation(U8G2_R2);
+      inF = true;
+      inUSAQI = false;
+  } else if (buttonConfig == 3) {
+    updateOLED2("Temp. in F", "PM in US AQI", "Display Top");
+      u8g2.setDisplayRotation(U8G2_R2);
+       inF = true;
+      inUSAQI = true;
+  } else 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;
+  } else if (buttonConfig == 6) {
+    updateOLED2("Temp. in F", "PM in ug/m3", "Display Bottom");
+    u8g2.setDisplayRotation(U8G2_R0);
+      inF = true;
+      inUSAQI = false;
+  } else  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_WITH_SGP30/DIY_PRO_WITH_SGP30.ino

@@ -25,7 +25,7 @@ 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
 
 */
 

examples/DIY_PRO_WITH_SGP40/DIY_PRO_WITH_SGP40.ino

@@ -20,7 +20,7 @@ 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
 
 */
 

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=2.4.0
+version=2.4.1
 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.