corrected version number

Update AirGradient.cpp

AirGradient.cpp

@@ -11,7 +11,7 @@
 #include <SoftwareSerial.h>
 #include "Arduino.h"
 #include <Wire.h>
-#include <Math.h>
+#include <math.h>
 
 
 // Constructor /////////////////////////////////////////////////////////////////
@@ -303,7 +303,7 @@ TMP_RH AirGradient::periodicFetchData() //
     return result;
   }
   else
-    returnError(error);
+    return returnError(error);
 }
 
 TMP_RH_ErrorCode AirGradient::periodicStop() {
@@ -607,47 +607,27 @@ const char* AirGradient::getCO2(int retryLimit) {
   return Char_CO2;
 }
 int AirGradient::getCO2_Raw(){
-  int retry = 0;
+  const byte CO2Command[] = {0xFE, 0X44, 0X00, 0X08, 0X02, 0X9F, 0X25};
-    CO2_READ_RESULT result;
+  byte CO2Response[] = {0,0,0,0,0,0,0};
-    const byte CO2Command[] = {0xFE, 0X44, 0X00, 0X08, 0X02, 0X9F, 0X25};
-    byte CO2Response[] = {0,0,0,0,0,0,0};
 
-    while(!(_SoftSerial_CO2->available())) {
+  _SoftSerial_CO2->write(CO2Command, 7);
-        retry++;
+  delay(100);  //give the sensor a bit of time to respond
-        // keep sending request until we start to get a response
-        _SoftSerial_CO2->write(CO2Command, 7);
-        delay(50);
-        if (retry > 10) {
-            return -1;
-        }
-    }
-
-    int timeout = 0; 
-    
-    while (_SoftSerial_CO2->available() < 7) {
-        timeout++; 
-        if (timeout > 10) {
-            while(_SoftSerial_CO2->available())  
-            _SoftSerial_CO2->read();
-            break;                    
-        }
-        delay(50);
-    }
 
+  if (_SoftSerial_CO2->available()){
     for (int i=0; i < 7; i++) {
-        int byte = _SoftSerial_CO2->read();
+      int byte = _SoftSerial_CO2->read();
-        if (byte == -1) {
+      CO2Response[i] = byte;
-            result.success = false;
+      if (CO2Response[0] != 254) {
-            return -1;
+        return -1;  //error code for debugging
-        }
+      }
-        CO2Response[i] = byte;
     }
-    int valMultiplier = 1;
+    unsigned long val = CO2Response[3]*256 + CO2Response[4];
-    int high = CO2Response[3];                      
-    int low = CO2Response[4];                       
-    unsigned long val = high*256 + low;  
-
     return val;
+  }
+  else
+  {
+  return -2; //error code for debugging
+  }
 }
 
 //END CO2 FUNCTIONS //

LICENSE.md

@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2020 AirGradient
+Copyright (c) 2022 AirGradient
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -3,6 +3,6 @@ AirGradient Arduino Library for ESP8266 (Wemos D1 MINI)
 
 Build your own low cost air quality sensor with optional display measuring PM2.5, CO2, Temperature and Humidity. 
 
-This library makes it easy to read the sensor data from the Plantower PMS5003 PM2.5 sensor, the Senseair S8 and the SHT30/31 Temperature and Humidity sensor. Visit our blog for detailed build instructions and PCB layout.
+This library makes it easy to read the sensor data from the Plantower PMS5003 PM2.5 sensor, the Senseair S8 and the SHT30/31 Temperature and Humidity sensor. Visit our DIY section for detailed build instructions and PCB layout.
 
-https://www.airgradient.com/blog/
+https://www.airgradient.com/diy/

examples/C02_PM_SHT/C02_PM_SHT.ino

@@ -1,26 +0,0 @@
-#include <AirGradient.h>
-AirGradient ag = AirGradient();
-
-void setup(){
-  Serial.begin(9600);
-  ag.PMS_Init();
-  ag.CO2_Init();
-  ag.TMP_RH_Init(0x44); //check for SHT sensor with address 0x44
-}
-
-void loop(){
-    
-Serial.print("PM2: ");
-Serial.println(ag.getPM2());
-
-
-Serial.print("CO2: ");
-Serial.println(ag.getCO2());
-
-TMP_RH result = ag.periodicFetchData();
-Serial.print("Humidity: ");
-Serial.print(result.rh);
-Serial.print(" Temperature: ");
-Serial.println(result.t);
-delay(5000);
-}

examples/C02_PM_SHT_OLED/C02_PM_SHT_OLED.ino

@@ -1,41 +0,0 @@
-#include <AirGradient.h>
-#include <Adafruit_GFX.h>
-#include <Adafruit_SSD1306.h>
-
-AirGradient ag = AirGradient();
-#define OLED_RESET 0
-Adafruit_SSD1306 display(OLED_RESET);
-
-void setup(){
-  Serial.begin(9600);
-  display.begin(SSD1306_SWITCHCAPVCC, 0x3C); 
-  ag.PMS_Init();
-  ag.CO2_Init();
-  ag.TMP_RH_Init(0x44); //check for SHT sensor with address 0x44
-  showTextRectangle("Init", String(ESP.getChipId(),HEX),"AirGradient");
-  delay(2000);
-}
-
-void loop(){
-  int PM2 = ag.getPM2_Raw();
-  int CO2 = ag.getCO2_Raw();
-  TMP_RH result = ag.periodicFetchData();
-  showTextRectangle(String(result.t)+"c "+String(result.rh)+"%", "PM2: "+ String(ag.getPM2()), "CO2: "+String(ag.getCO2())+"");
-  delay(5000);
-}
-
-// DISPLAY
-void showTextRectangle(String ln1, String ln2, String ln3) {
-  display.clearDisplay();
-  display.setTextColor(WHITE);
-  display.setTextSize(1);
-  display.setCursor(32,8);
-  display.println(ln1);
-  display.setTextSize(1);
-  display.setCursor(32,16);
-  display.println(ln2);
-  display.setTextSize(1);
-  display.setCursor(32,24);
-  display.println(ln3);
-  display.display();
-}

examples/C02_PM_SHT_OLED_WIFI/C02_PM_SHT_OLED_WIFI.ino

@@ -1,77 +1,182 @@
+/*
+This is the code for the AirGradient DIY 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.
+
+For build instructions please visit https://www.airgradient.com/diy/
+
+Compatible with the following sensors:
+Plantower PMS5003 (Fine Particle Sensor)
+SenseAir S8 (CO2 Sensor)
+SHT30/31 (Temperature/Humidity Sensor)
+
+Please install ESP8266 board manager (tested with version 3.0.0)
+
+The codes needs the following libraries installed:
+"WifiManager by tzapu, tablatronix" tested with Version 2.0.3-alpha
+"ESP8266 and ESP32 OLED driver for SSD1306 displays by ThingPulse, Fabrice Weinberg" tested with Version 4.1.0
+
+If you have any questions please visit our forum at https://forum.airgradient.com/
+
+Configuration:
+Please set in the code below which sensor you are using and if you want to connect it to WiFi.
+You can also switch PM2.5 from ug/m3 to US AQI and Celcius to Fahrenheit
+
+If you are a school or university contact us for a free trial on the AirGradient platform.
+https://www.airgradient.com/schools/
+
+Kits with all required components are available at https://www.airgradient.com/diyshop/
+
+MIT License
+*/
+
 #include <AirGradient.h>
-#include <Adafruit_GFX.h>
+
-#include <Adafruit_SSD1306.h>
 #include <WiFiManager.h>
+
 #include <ESP8266WiFi.h>
+
 #include <ESP8266HTTPClient.h>
 
-AirGradient ag = AirGradient();
+#include <Wire.h>
-#define OLED_RESET 0
-Adafruit_SSD1306 display(OLED_RESET);
 
+#include "SSD1306Wire.h"
+
+AirGradient ag = AirGradient();
+
+SSD1306Wire display(0x3c, SDA, SCL);
+
+// set sensors that you do not use to false
+boolean hasPM = true;
+boolean hasCO2 = true;
+boolean hasSHT = true;
+
+// set to true to switch PM2.5 from ug/m3 to US AQI
+boolean inUSaqi = false;
+
+// 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
+boolean connectWIFI = false;
+
+// change if you want to send the data to another server
 String APIROOT = "http://hw.airgradient.com/";
 
-void setup(){
+void setup() {
   Serial.begin(9600);
-  display.begin(SSD1306_SWITCHCAPVCC, 0x3C); 
+
-  ag.PMS_Init();
+  display.init();
-  ag.CO2_Init();
+  display.flipScreenVertically();
-  ag.TMP_RH_Init(0x44); //check for SHT sensor with address 0x44
+  showTextRectangle("Init", String(ESP.getChipId(), HEX), true);
-  showTextRectangle("Init", String(ESP.getChipId(),HEX),"AirGradient");
+
-  connectToWifi();
+  if (hasPM) ag.PMS_Init();
+  if (hasCO2) ag.CO2_Init();
+  if (hasSHT) ag.TMP_RH_Init(0x44);
+
+  if (connectWIFI) connectToWifi();
   delay(2000);
 }
 
-void loop(){
+void loop() {
-  int PM2 = ag.getPM2_Raw();
+
-  int CO2 = ag.getCO2_Raw();
+  // create payload
-  TMP_RH result = ag.periodicFetchData();
+
-  showTextRectangle(String(result.t)+"c "+String(result.rh)+"%", "PM2: "+ String(PM2), "CO2: "+String(CO2)+"");
+  String payload = "{\"wifi\":" + String(WiFi.RSSI()) + ",";
+
+  if (hasPM) {
+    int PM2 = ag.getPM2_Raw();
+    payload = payload + "\"pm02\":" + String(PM2);
+
+    if (inUSaqi) {
+      showTextRectangle("AQI", String(PM_TO_AQI_US(PM2)), false);
+    } else {
+      showTextRectangle("PM2", String(PM2), false);
+    }
+
+    delay(3000);
+
+  }
+
+  if (hasCO2) {
+    if (hasPM) payload = payload + ",";
+    int CO2 = ag.getCO2_Raw();
+    payload = payload + "\"rco2\":" + String(CO2);
+    showTextRectangle("CO2", String(CO2), false);
+    delay(3000);
+  }
+
+  if (hasSHT) {
+    if (hasCO2 || hasPM) payload = payload + ",";
+    TMP_RH result = ag.periodicFetchData();
+    payload = payload + "\"atmp\":" + String(result.t) + ",\"rhum\":" + String(result.rh);
+
+    if (inF) {
+      showTextRectangle(String((result.t * 9 / 5) + 32), String(result.rh) + "%", false);
+    } else {
+      showTextRectangle(String(result.t), String(result.rh) + "%", false);
+    }
+
+    delay(3000);
+  }
+
+  payload = payload + "}";
 
   // send payload
-  String payload = "{\"pm02\":" + String(ag.getPM2()) +  ",\"wifi\":" + String(WiFi.RSSI()) +  ",\"rco2\":" + String(ag.getCO2()) + ",\"atmp\":" + String(result.t) +   ",\"rhum\":" + String(result.rh) + "}";
+  if (connectWIFI) {
-  Serial.println(payload);
+    Serial.println(payload);
-  String POSTURL = APIROOT + "sensors/airgradient:" + String(ESP.getChipId(),HEX) + "/measures";
+    String POSTURL = APIROOT + "sensors/airgradient:" + String(ESP.getChipId(), HEX) + "/measures";
-  Serial.println(POSTURL);
+    Serial.println(POSTURL);
-  HTTPClient http;
+    WiFiClient client;
-  http.begin(POSTURL);
+    HTTPClient http;
-  http.addHeader("content-type", "application/json");
+    http.begin(client, POSTURL);
-  int httpCode = http.POST(payload);
+    http.addHeader("content-type", "application/json");
-  String response = http.getString();
+    int httpCode = http.POST(payload);
-  Serial.println(httpCode);
+    String response = http.getString();
-  Serial.println(response);
+    Serial.println(httpCode);
-  http.end();
+    Serial.println(response);
-  
+    http.end();
-  delay(15000);
+    delay(21000);
+  }
 }
 
 // DISPLAY
-void showTextRectangle(String ln1, String ln2, String ln3) {
+void showTextRectangle(String ln1, String ln2, boolean small) {
-  display.clearDisplay();
+  display.clear();
-  display.setTextColor(WHITE);
+  display.setTextAlignment(TEXT_ALIGN_LEFT);
-  display.setTextSize(1);
+  if (small) {
-  display.setCursor(32,8);
+    display.setFont(ArialMT_Plain_16);
-  display.println(ln1);
+  } else {
-  display.setTextSize(1);
+    display.setFont(ArialMT_Plain_24);
-  display.setCursor(32,16);
+  }
-  display.println(ln2);
+  display.drawString(32, 16, ln1);
-  display.setTextSize(1);
+  display.drawString(32, 36, ln2);
-  display.setCursor(32,24);
-  display.println(ln3);
   display.display();
 }
 
 // Wifi Manager
-void connectToWifi(){
+void connectToWifi() {
   WiFiManager wifiManager;
-  //chWiFi.disconnect(); //to delete previous saved hotspot
+  //WiFi.disconnect(); //to delete previous saved hotspot
-  String HOTSPOT = "AIRGRADIENT-"+String(ESP.getChipId(),HEX);
+  String HOTSPOT = "AIRGRADIENT-" + String(ESP.getChipId(), HEX);
   wifiManager.setTimeout(120);
-  if(!wifiManager.autoConnect((const char*)HOTSPOT.c_str())) {
+  if (!wifiManager.autoConnect((const char * ) HOTSPOT.c_str())) {
-      //Serial.println("failed to connect and hit timeout");
+    Serial.println("failed to connect and hit timeout");
-      delay(3000);
+    delay(3000);
-      ESP.restart();
+    ESP.restart();
-      delay(5000);
+    delay(5000);
   }
 
 }
+
+// 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/C02_SIMPLE/C02_SIMPLE.ino

@@ -0,0 +1,38 @@
+/*
+This is the code for the AirGradient DIY 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.
+
+For build instructions please visit https://www.airgradient.com/diy/
+
+Compatible with the following sensors:
+SenseAir S8 (CO2 Sensor)
+
+Please install ESP8266 board manager (tested with version 3.0.0)
+
+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/schools/
+
+Kits with all required components are available at https://www.airgradient.com/diyshop/
+
+MIT License
+*/
+
+#include <AirGradient.h>
+AirGradient ag = AirGradient();
+
+void setup(){
+  Serial.begin(9600);
+  ag.CO2_Init();
+}
+
+void loop(){
+
+int CO2 = ag.getCO2_Raw();
+Serial.print("C02: ");
+Serial.println(ag.getCO2());
+
+delay(5000);
+}

examples/C02_Test/C02_Test.ino

@@ -1,16 +0,0 @@
-#include <AirGradient.h>
-AirGradient ag = AirGradient();
-
-void setup(){
-  Serial.begin(9600);
-  ag.CO2_Init();
-}
-
-void loop(){
-
-int CO2 = ag.getCO2_Raw();
-Serial.print("C02: ");
-Serial.println(ag.getCO2());
-
-delay(5000);
-}

examples/CO2_TRAFFIC_LIGHT_SIMPLE/CO2_TRAFFIC_LIGHT_SIMPLE.ino

@@ -0,0 +1,134 @@
+/*
+This is the code for the AirGradient DIY CO2 Traffic light with an ESP8266 Microcontroller.
+
+For build instructions please visit https://www.airgradient.com/diy-co2-traffic-light/
+
+Compatible with the following sensors:
+SenseAir S8 (CO2 Sensor)
+
+Please install ESP8266 board manager (tested with version 3.0.0)
+
+Please install the following libraries:
+"Adafruit NeoMatrix" Library  (tested with 1.2.0)
+"WifiManager by tzapu, tablatronix" tested with Version 2.0.3-alpha
+
+Kits with all required components are available at https://www.airgradient.com/diyshop/
+
+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/schools/
+
+MIT License
+*/
+
+// Adafruit_NeoMatrix example for single NeoPixel Shield.
+// Scrolls 'Howdy' across the matrix in a portrait (vertical) orientation.
+// Adafruit_NeoMatrix example for single NeoPixel Shield.
+// Scrolls 'Howdy' across the matrix in a portrait (vertical) orientation.
+
+#include <AirGradient.h>
+#include <WiFiManager.h>
+#include <ESP8266WiFi.h>
+#include <ESP8266HTTPClient.h>
+
+#include <Adafruit_GFX.h>
+#include <Adafruit_NeoMatrix.h>
+#include <Adafruit_NeoPixel.h>
+#ifndef PSTR
+ #define PSTR // Make Arduino Due happy
+#endif
+
+AirGradient ag = AirGradient();
+#define PIN D8
+
+int co2 = 0;
+String text = "AirGradient CO2";
+// set to true if you want to connect to wifi. The display will show values only when the sensor has wifi connection
+boolean connectWIFI=true;
+int greenToOrange = 800;
+int orangeToRed = 1200;
+
+// change if you want to send the data to another server
+String APIROOT = "http://hw.airgradient.com/";
+
+Adafruit_NeoMatrix matrix = Adafruit_NeoMatrix(8, 8, PIN,
+  NEO_MATRIX_TOP     + NEO_MATRIX_RIGHT +
+  NEO_MATRIX_COLUMNS + NEO_MATRIX_PROGRESSIVE,
+  NEO_GRB            + NEO_KHZ800);
+
+void setup() {
+  Serial.begin(9600);
+  ag.CO2_Init();
+  matrix.begin();
+  matrix.setRotation(1); // change rotation
+  matrix.setTextWrap(false);
+  matrix.setBrightness(40);
+  matrix.setTextColor(matrix.Color(70,130,180));
+
+  Serial.println("Chip ID: "+String(ESP.getChipId(),HEX));
+  if (connectWIFI) connectToWifi();
+  delay(2000);
+}
+
+void loop() {
+  showText();
+}
+
+int x    = matrix.width();
+
+void showText() {
+  Serial.println("in loop");
+  matrix.fillScreen(0);
+  matrix.setCursor(x, 0);
+  matrix.print(String(text));
+  if(--x < -100) {
+    x = matrix.width();
+    Serial.println("end text");
+    co2 = ag.getCO2_Raw();
+    text = String(co2)+"ppm";
+      if (co2>350) matrix.setTextColor(matrix.Color(0, 255, 0));
+      if (co2>greenToOrange) matrix.setTextColor(matrix.Color(255, 90, 0));
+      if (co2>orangeToRed) matrix.setTextColor(matrix.Color(255,0, 0));
+
+    // send payload
+    String payload = "{\"wifi\":" + String(WiFi.RSSI()) + ",";
+    payload = payload + "\"rco2\":" + String(co2);
+    payload = payload + "}";
+
+    if (connectWIFI) {
+      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();
+      delay(20000);
+    }
+
+    delay(10000);
+  }
+
+  matrix.show();
+  delay(100);
+}
+
+// Wifi Manager
+void connectToWifi(){
+  WiFiManager wifiManager;
+  //WiFi.disconnect(); //to delete previous saved hotspot
+  String HOTSPOT = "AIRGRADIENT-"+String(ESP.getChipId(),HEX);
+  wifiManager.setTimeout(120);
+  if(!wifiManager.autoConnect((const char*)HOTSPOT.c_str())) {
+      Serial.println("failed to connect and hit timeout");
+      delay(3000);
+      ESP.restart();
+      delay(5000);
+  }
+  }

examples/MHZ19_Test/MHZ19_Test.ino

@@ -1,16 +0,0 @@
-#include <AirGradient.h>
-AirGradient ag = AirGradient();
-
-void setup(){
-  Serial.begin(9600);
-  ag.MHZ19_Init(MHZ19B);
-}
-
-void loop(){
-    
-int MHZ19_C02 = ag.readMHZ19();
-Serial.print("C02: ");
-Serial.println(MHZ19_C02);
-
-delay(5000);
-}

examples/MINI_DISPLAY/MINI_DISPLAY.ino

@@ -0,0 +1,381 @@
+/*
+This is the code for the AirGradient DIY Mini Display with an ESP8266 Microcontroller.
+It can be configures to show the outside air quality as well as one indoor location from the AirGradient platform.
+
+For build instructions please visit
+
+https://www.airgradient.com/resources/airgradient-diy-display/
+
+
+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
+
+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.
+
+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/schools/
+
+MIT License
+*/
+
+#include <WiFiManager.h>
+
+#include <ArduinoJson.h>
+
+#include <ESP8266HTTPClient.h>
+
+#include <SPI.h>
+
+#include <Adafruit_GFX.h>
+
+#include <Adafruit_ILI9341.h>
+
+#include <Fonts/FreeSans9pt7b.h>
+
+#include <Fonts/FreeSans12pt7b.h>
+
+#include <Fonts/FreeSans18pt7b.h>
+
+#define TFT_CS D0
+#define TFT_DC D8
+#define TFT_RST - 1
+#define TS_CS D3
+
+Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);
+
+const char * locNameInside;
+const char * locNameOutside;
+
+const char * place_timezone;
+const char * location;
+bool outdoor_offline;
+bool indoor_offline;
+const char * outdoor_policy;
+const char * outdoor_date;
+const char * indoor_date;
+boolean prodMode = true;
+
+String deviceID;
+const char * timex;
+int pm02;
+int pi02;
+int pi02_outside;
+int rco2;
+float atmp;
+float atmp_outside;
+int rhum_outside;
+int rhum;
+int heat;
+
+const char * pi02_color;
+const char * pi02_color_outside;
+const char * pi02_category;
+const char * pm02_color;
+const char * pm02_category;
+const char * rco2_color;
+const char * rco2_category;
+const char * heat_color;
+const char * heat_color_outside;
+const char * heat_category;
+
+// Configuration
+#define API_ROOT "http://hw.airgradient.com/displays/"
+boolean inUSaqi = false;
+boolean inF = false;
+
+String getDeviceId() {
+  return String(ESP.getChipId(), HEX);
+}
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println("Chip ID");
+  Serial.println(String(ESP.getChipId(), HEX));
+
+  tft.begin();
+  tft.setRotation(2);
+  while (!Serial && (millis() <= 1000));
+  welcomeMessage();
+  connectToWifi();
+
+  Serial.print("Connecting");
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+  }
+  Serial.println();
+
+  tft.fillScreen(ILI9341_BLACK);
+  delay(2000);
+}
+
+void loop() {
+
+  WiFiClient client;
+  HTTPClient http;
+  http.begin(client, API_ROOT + getDeviceId());
+
+  int httpCode = http.GET();
+  if (httpCode == 200) {
+    String airData = http.getString();
+    payloadToDataInside(airData);
+    Serial.print("airData1 : ");
+    Serial.println(airData);
+  } else {
+    Serial.println("error");
+    Serial.println(httpCode);
+  }
+  http.end();
+
+  delay(1000);
+  updateDisplay();
+
+  delay(120000);
+  tft.fillScreen(ILI9341_BLACK);
+  tft.setTextColor(ILI9341_WHITE);
+  tft.setFont( & FreeSans12pt7b);
+  tft.setCursor(5, 20);
+  tft.println("requesting data...");
+}
+
+void payloadToDataInside(String payload) {
+  const size_t capacity = JSON_ARRAY_SIZE(1) + 2 * JSON_OBJECT_SIZE(2) + 2 * JSON_OBJECT_SIZE(3) + JSON_OBJECT_SIZE(4) + JSON_OBJECT_SIZE(10) + JSON_OBJECT_SIZE(13) + 530;
+  DynamicJsonBuffer jsonBuffer(capacity);
+  JsonObject & root = jsonBuffer.parseObject(payload);
+  location = root["place"]["name"];
+  place_timezone = root["place"]["timezone"];
+  JsonObject & outdoor = root["outdoor"];
+  locNameOutside = outdoor["name"];
+  outdoor_offline = outdoor["offline"];
+  outdoor_policy = outdoor["guidelines"][0]["title"];
+  JsonObject & outdoor_current = outdoor["current"];
+
+  atmp_outside = outdoor_current["atmp"];
+  rhum_outside = outdoor_current["rhum"];
+  outdoor_date = outdoor_current["date"];
+  JsonObject & indoor = root["indoor"];
+  locNameInside = indoor["name"];
+  indoor_offline = indoor["offline"];
+  JsonObject & indoor_current = indoor["current"];
+
+  atmp = indoor_current["atmp"];
+  rhum = indoor_current["rhum"];
+  rco2 = indoor_current["rco2"];
+  indoor_date = indoor_current["date"];
+  rco2_color = indoor_current["rco2_clr"];
+  rco2_category = indoor_current["rco2_lbl"];
+
+  if (inUSaqi) {
+    pi02_outside = outdoor_current["pi02"];
+    pi02_color_outside = outdoor_current["pi02_clr"];
+    pi02_category = outdoor_current["pi02_lbl"];
+    pi02 = indoor_current["pi02"];
+    pi02_color = indoor_current["pi02_clr"];
+    pi02_category = indoor_current["pi02_lbl"];
+  } else {
+    pi02_outside = outdoor_current["pm02"];
+    pi02_color_outside = outdoor_current["pm02_clr"];
+    pi02_category = outdoor_current["pm02_lbl"];
+    pi02 = indoor_current["pm02"];
+    pi02_color = indoor_current["pm02_clr"];
+    pi02_category = indoor_current["pm02_lbl"];
+  }
+
+}
+
+void updateDisplay() {
+  int y = 25;
+  int boxHeight = 75;
+  int boxWidth = 110;
+  int radius = 8;
+  tft.fillScreen(ILI9341_BLACK);
+
+  tft.setFont( & FreeSans9pt7b);
+  tft.setTextColor(ILI9341_WHITE, ILI9341_BLACK);
+  tft.setCursor(5, y);
+  tft.println(location);
+
+  tft.drawLine(0, 35, 250, 35, ILI9341_WHITE);
+
+  y = y + 50;
+
+  tft.setFont( & FreeSans9pt7b);
+  tft.setTextColor(ILI9341_WHITE, ILI9341_BLACK);
+  tft.setCursor(5, y);
+  tft.println(locNameOutside);
+  tft.setFont( & FreeSans12pt7b);
+
+  y = y + 12;
+
+  if (String(pi02_color_outside) == "green") {
+    tft.fillRoundRect(5, y, boxWidth, boxHeight, radius, ILI9341_GREEN);
+  } else if (String(pi02_color_outside) == "yellow") {
+    tft.fillRoundRect(5, y, boxWidth, boxHeight, radius, ILI9341_YELLOW);
+  } else if (String(pi02_color_outside) == "orange") {
+    tft.fillRoundRect(5, y, boxWidth, boxHeight, radius, ILI9341_ORANGE);
+  } else if (String(pi02_color_outside) == "red") {
+    tft.fillRoundRect(5, y, boxWidth, boxHeight, radius, ILI9341_RED);
+  } else if (String(pi02_color_outside) == "purple") {
+    tft.fillRoundRect(5, y, boxWidth, boxHeight, radius, ILI9341_PURPLE);
+  } else if (String(pi02_color_outside) == "brown") {
+    tft.fillRoundRect(5, y, boxWidth, boxHeight, radius, ILI9341_MAROON);
+  }
+
+  if (String(heat_color_outside) == "green") {
+    tft.fillRoundRect(5 + boxWidth + 10, y, boxWidth, boxHeight, radius, ILI9341_GREEN);
+  } else if (String(heat_color_outside) == "yellow") {
+    tft.fillRoundRect(5 + boxWidth + 10, y, boxWidth, boxHeight, radius, ILI9341_YELLOW);
+  } else if (String(heat_color_outside) == "orange") {
+    tft.fillRoundRect(5 + boxWidth + 10, y, boxWidth, boxHeight, radius, ILI9341_ORANGE);
+  } else if (String(heat_color_outside) == "red") {
+    tft.fillRoundRect(5 + boxWidth + 10, y, boxWidth, boxHeight, radius, ILI9341_RED);
+  } else if (String(heat_color_outside) == "purple") {
+    tft.fillRoundRect(5 + boxWidth + 10, y, boxWidth, boxHeight, radius, ILI9341_PURPLE);
+  } else if (String(heat_color_outside) == "brown") {
+    tft.fillRoundRect(5 + boxWidth + 10, y, boxWidth, boxHeight, radius, ILI9341_MAROON);
+  }
+
+  tft.setFont( & FreeSans9pt7b);
+  tft.setTextColor(ILI9341_BLACK, ILI9341_BLACK);
+  tft.setCursor(20, y + boxHeight - 10);
+
+  if (inUSaqi) {
+    tft.println("US AQI");
+  } else {
+    tft.println("ug/m3");
+  }
+
+  tft.setFont( & FreeSans18pt7b);
+  tft.setTextColor(ILI9341_BLACK, ILI9341_BLACK);
+  tft.setCursor(20, y + 40);
+  tft.println(String(pi02_outside));
+
+  tft.setFont( & FreeSans9pt7b);
+
+  tft.setTextColor(ILI9341_WHITE, ILI9341_BLACK);
+
+  tft.setCursor(20 + boxWidth + 10, y + 20);
+
+  if (inF) {
+    tft.println(String((atmp_outside * 9 / 5) + 32) + "F");
+  } else {
+    tft.println(String(atmp_outside) + "C");
+  }
+
+  tft.setCursor(20 + boxWidth + 10, y + 40);
+  tft.println(String(rhum_outside) + "%");
+
+  tft.setTextColor(ILI9341_DARKGREY, ILI9341_BLACK);
+  tft.setCursor(20 + boxWidth + 10, y + 60);
+  tft.println(String(outdoor_date));
+
+  //inside
+
+  y = y + 110;
+
+  tft.setFont( & FreeSans9pt7b);
+  tft.setTextColor(ILI9341_WHITE, ILI9341_BLACK);
+  tft.setCursor(5, y);
+  tft.println(locNameInside);
+  tft.setFont( & FreeSans12pt7b);
+
+  y = y + 12;
+
+  if (String(pi02_color) == "green") {
+    tft.fillRoundRect(5, y, boxWidth, boxHeight, radius, ILI9341_GREEN);
+  } else if (String(pi02_color) == "yellow") {
+    tft.fillRoundRect(5, y, boxWidth, boxHeight, radius, ILI9341_YELLOW);
+  } else if (String(pi02_color) == "orange") {
+    tft.fillRoundRect(5, y, boxWidth, boxHeight, radius, ILI9341_ORANGE);
+  } else if (String(pi02_color) == "red") {
+    tft.fillRoundRect(5, y, boxWidth, boxHeight, radius, ILI9341_RED);
+  } else if (String(pi02_color) == "purple") {
+    tft.fillRoundRect(5, y, boxWidth, boxHeight, radius, ILI9341_PURPLE);
+  } else if (String(pi02_color) == "brown") {
+    tft.fillRoundRect(5, y, boxWidth, boxHeight, radius, ILI9341_MAROON);
+  }
+
+  if (String(rco2_color) == "green") {
+    tft.fillRoundRect(5 + boxWidth + 10, y, boxWidth, boxHeight, radius, ILI9341_GREEN);
+  } else if (String(rco2_color) == "yellow") {
+    tft.fillRoundRect(5 + boxWidth + 10, y, boxWidth, boxHeight, radius, ILI9341_YELLOW);
+  } else if (String(rco2_color) == "orange") {
+    tft.fillRoundRect(5 + boxWidth + 10, y, boxWidth, boxHeight, radius, ILI9341_ORANGE);
+  } else if (String(rco2_color) == "red") {
+    tft.fillRoundRect(5 + boxWidth + 10, y, boxWidth, boxHeight, radius, ILI9341_RED);
+  } else if (String(rco2_color) == "purple") {
+    tft.fillRoundRect(5 + boxWidth + 10, y, boxWidth, boxHeight, radius, ILI9341_PURPLE);
+  } else if (String(rco2_color) == "brown") {
+    tft.fillRoundRect(5 + boxWidth + 10, y, boxWidth, boxHeight, radius, ILI9341_MAROON);
+  }
+
+  tft.setFont( & FreeSans9pt7b);
+  tft.setTextColor(ILI9341_BLACK, ILI9341_BLACK);
+  tft.setCursor(20, y + boxHeight - 10);
+
+  if (inUSaqi) {
+    tft.println("US AQI");
+  } else {
+    tft.println("ug/m3");
+  }
+
+  tft.setCursor(20 + boxWidth + 10, y + boxHeight - 10);
+  tft.println("CO2 ppm");
+
+  tft.setFont( & FreeSans18pt7b);
+  tft.setTextColor(ILI9341_BLACK, ILI9341_BLACK);
+  tft.setCursor(20, y + 40);
+  tft.println(String(pi02));
+  tft.setCursor(20 + boxWidth + 10, y + 40);
+  tft.println(String(rco2));
+
+  y = y + 100;
+
+  tft.setFont( & FreeSans9pt7b);
+  tft.setTextColor(ILI9341_DARKGREY, ILI9341_BLACK);
+  tft.setCursor(boxWidth - 30, y);
+  tft.println(String(indoor_date));
+}
+
+void welcomeMessage() {
+  Serial.println("Welcome Message 2");
+  tft.setFont( & FreeSans9pt7b);
+  tft.fillScreen(ILI9341_BLACK);
+  tft.setTextColor(ILI9341_WHITE);
+
+  tft.setCursor(40, 24);
+  tft.setFont( & FreeSans12pt7b);
+  tft.setCursor(5, 20);
+  tft.println("AirGradient");
+
+  tft.setFont( & FreeSans9pt7b);
+  tft.setCursor(5, 100);
+  tft.println("id: " + String(ESP.getChipId(), HEX));
+
+  tft.setCursor(5, 140);
+  tft.println("connecting ...");
+
+  delay(2000);
+}
+
+void connectToWifi() {
+  delay(2000);
+
+  WiFiManager wifiManager;
+  //chWiFi.disconnect(); //to delete previous saved hotspot
+  String HOTSPOT = "AIRGRADIENT-DISPLAY-" + String(ESP.getChipId(), HEX);
+  wifiManager.setTimeout(120);
+  if (!wifiManager.autoConnect((const char * ) HOTSPOT.c_str())) {
+    Serial.println("failed to connect and hit timeout");
+    delay(3000);
+    ESP.restart();
+    delay(5000);
+  }
+}

examples/PM2_SIMPLE/PM2_SIMPLE.ino

@@ -0,0 +1,54 @@
+/*
+This is the code for the AirGradient DIY 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.
+
+For build instructions please visit https://www.airgradient.com/diy/
+
+Compatible with the following sensors:
+Plantower PMS5003 (Fine Particle Sensor)
+
+Please install ESP8266 board manager (tested with version 3.0.0)
+
+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/schools/
+
+Kits with all required components are available at https://www.airgradient.com/diyshop/
+
+MIT License
+*/
+
+#include <AirGradient.h>
+
+AirGradient ag = AirGradient();
+
+void setup() {
+  Serial.begin(9600);
+  ag.PMS_Init();
+}
+
+void loop() {
+
+  int PM2 = ag.getPM2_Raw();
+
+  Serial.print("PM2.5 in ug/m3: ");
+  Serial.println(String(PM2));
+
+  Serial.print("PM2.5 in US AQI: ");
+  Serial.println(String(PM_TO_AQI_US(PM2)));
+
+  delay(5000);
+}
+
+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/PM2_Test/PM2_Test.ino

@@ -1,16 +0,0 @@
-#include <AirGradient.h>
-AirGradient ag = AirGradient();
-
-void setup(){
-  Serial.begin(9600);
-  ag.PMS_Init();
-}
-
-void loop(){
-    
-int PM2 = ag.getPM2_Raw();
-Serial.print("PM2: ");
-Serial.println(ag.getPM2());
-
-delay(5000);
-}

examples/SHT_SIMPLE/SHT_SIMPLE.ino

@@ -0,0 +1,45 @@
+/*
+This is the code for the AirGradient DIY 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.
+
+For build instructions please visit https://www.airgradient.com/diy/
+
+Compatible with the following sensors:
+SHT30/31 (Temperature/Humidity Sensor)
+
+Please install ESP8266 board manager (tested with version 3.0.0)
+
+If you are a school or university contact us for a free trial on the AirGradient platform.
+https://www.airgradient.com/schools/
+
+Kits with all required components are available at https://www.airgradient.com/diyshop/
+
+If you have any questions please visit our forum at https://forum.airgradient.com/
+
+MIT License
+*/
+
+#include <AirGradient.h>
+AirGradient ag = AirGradient();
+
+void setup(){
+  Serial.begin(9600);
+  ag.TMP_RH_Init(0x44); //check for SHT sensor with address 0x44
+}
+
+void loop(){
+
+  TMP_RH result = ag.periodicFetchData();
+
+  Serial.print("Relative Humidity in %: ");
+  Serial.println(result.rh);
+
+  Serial.print(" Temperature in Celcius: ");
+  Serial.println(result.t);
+
+  Serial.print(" Temperature in Fahrenheit: ");
+  Serial.println((result.t * 9 / 5) + 32);
+
+  delay(5000);
+}

examples/TMP_RH_Test/TMP_RH_Test.ino

@@ -1,16 +0,0 @@
-#include <AirGradient.h>
-AirGradient ag = AirGradient();
-
-void setup(){
-  Serial.begin(9600);
-  ag.TMP_RH_Init(0x44); //check for SHT sensor with address 0x44
-}
-
-void loop(){
-  TMP_RH result = ag.periodicFetchData();
-  Serial.print("Humidity: ");
-  Serial.print(result.rh_char);
-  Serial.print(" Temperature: ");
-  Serial.println(result.t_char);
-  delay(5000);
-}

examples/TVOC/TVOC.ino

@@ -0,0 +1,158 @@
+/*
+This is the code for the AirGradient DIY 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.
+
+For build instructions please visit https://www.airgradient.com/diy/
+
+Instructions on using the TVOC sensor (SGP30) instead of the Temperature / Humidity sensor (SHT3x).
+
+https://www.airgradient.com/resources/tvoc-on-airgradient-diy-sensor/
+
+The codes needs the following libraries installed:
+"WifiManager by tzapu, tablatronix" tested with Version 2.0.3-alpha
+"ESP8266 and ESP32 OLED driver for SSD1306 displays by ThingPulse, Fabrice Weinberg" tested with Version 4.1.0
+"SGP30" by Rob Tillaart tested with Version 0.1.4
+
+Configuration:
+Please set in the code below which sensor you are using and if you want to connect it to WiFi.
+
+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/schools/
+
+MIT License
+*/
+
+#include "SGP30.h"
+SGP30 SGP;
+
+#include <AirGradient.h>
+#include <WiFiManager.h>
+#include <ESP8266WiFi.h>
+#include <ESP8266HTTPClient.h>
+
+#include <Wire.h>
+#include "SSD1306Wire.h"
+
+AirGradient ag = AirGradient();
+
+SSD1306Wire display(0x3c, SDA, SCL);
+
+WiFiClient client;
+
+// set sensors that you do not use to false
+boolean hasPM=true;
+boolean hasCO2=true;
+boolean hasSHT=false;
+boolean hasTVOC=true;
+
+// set to true if you want to connect to wifi. The display will show values only when the sensor has wifi connection
+boolean connectWIFI=true;
+
+// change if you want to send the data to another server
+String APIROOT = "http://hw.airgradient.com/";
+
+void setup(){
+  Serial.begin(9600);
+
+  display.init();
+  display.flipScreenVertically();
+  showTextRectangle("Init", String(ESP.getChipId(),HEX),true);
+
+  if (hasTVOC) SGP.begin();
+  if (hasPM) ag.PMS_Init();
+  if (hasCO2) ag.CO2_Init();
+  if (hasSHT) ag.TMP_RH_Init(0x44);
+
+  if (connectWIFI) connectToWifi();
+  delay(2000);
+}
+
+void loop(){
+
+  if (hasTVOC) SGP.measure(false);
+
+    // create payload
+
+  String payload = "{\"wifi\":" + String(WiFi.RSSI()) + ",";
+
+  if (hasPM) {
+    int PM2 = ag.getPM2_Raw();
+    payload=payload+"\"pm02\":" + String(PM2);
+    showTextRectangle("PM2",String(PM2),false);
+    delay(3000);
+  }
+
+    if (hasTVOC) {
+    if (hasPM) payload=payload+",";
+    int TVOC = SGP.getTVOC();
+    payload=payload+"\"tvoc\":" + String(TVOC);
+    showTextRectangle("TVOC",String(TVOC),false);
+    delay(3000);
+  }
+
+  if (hasCO2) {
+    if (hasTVOC) payload=payload+",";
+    int CO2 = ag.getCO2_Raw();
+    payload=payload+"\"rco2\":" + String(CO2);
+    showTextRectangle("CO2",String(CO2),false);
+    delay(3000);
+  }
+
+  if (hasSHT) {
+    if (hasCO2 || hasPM) payload=payload+",";
+    TMP_RH result = ag.periodicFetchData();
+    payload=payload+"\"atmp\":" + String(result.t) +   ",\"rhum\":" + String(result.rh);
+    showTextRectangle(String(result.t),String(result.rh)+"%",false);
+    delay(3000);
+  }
+
+   payload=payload+"}";
+
+  // send payload
+  if (connectWIFI){
+  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();
+  }
+}
+
+// DISPLAY
+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, 36, ln2);
+  display.display();
+}
+
+// Wifi Manager
+void connectToWifi(){
+  WiFiManager wifiManager;
+  //WiFi.disconnect(); //to delete previous saved hotspot
+  String HOTSPOT = "AIRGRADIENT-"+String(ESP.getChipId(),HEX);
+  wifiManager.setTimeout(120);
+  if(!wifiManager.autoConnect((const char*)HOTSPOT.c_str())) {
+      Serial.println("failed to connect and hit timeout");
+      delay(3000);
+      ESP.restart();
+      delay(5000);
+  }
+
+}

library.properties

@@ -1,5 +1,5 @@
 name=AirGradient Air Quality Sensor
-version=1.0.0
+version=1.4.2
 author=AirGradient <support@airgradient.com>
 maintainer=AirGradient <support@airgradient.com>
 sentence=ESP8266 library for an air quality sensor featuring PM2.5, CO2, Temperature and Humidity with OLED display.

readme.txt

@@ -1,39 +1,8 @@
-This is an example C++ library for Arduino 0004+, based on one created by 
+AirGradient Arduino Library for ESP8266 (Wemos D1 MINI)
-Nicholas Zambetti for Wiring 0006+
+=====================================================================================================
 
-Installation
+Build your own low cost air quality sensor with optional display measuring PM2.5, CO2, Temperature and Humidity. 
---------------------------------------------------------------------------------
 
-To install this library, just place this entire folder as a subfolder in your
+This library makes it easy to read the sensor data from the Plantower PMS5003 PM2.5 sensor, the Senseair S8 and the SHT30/31 Temperature and Humidity sensor. Visit our DIY section for detailed build instructions and PCB layout.
-Arduino/lib/targets/libraries folder.
-
-When installed, this library should look like:
-
-Arduino/lib/targets/libraries/Test              (this library's folder)
-Arduino/lib/targets/libraries/Test/Test.cpp     (the library implementation file)
-Arduino/lib/targets/libraries/Test/Test.h       (the library description file)
-Arduino/lib/targets/libraries/Test/keywords.txt (the syntax coloring file)
-Arduino/lib/targets/libraries/Test/examples     (the examples in the "open" menu)
-Arduino/lib/targets/libraries/Test/readme.txt   (this file)
-
-Building
---------------------------------------------------------------------------------
-
-After this library is installed, you just have to start the Arduino application.
-You may see a few warning messages as it's built.
-
-To use this library in a sketch, go to the Sketch | Import Library menu and
-select Test.  This will add a corresponding line to the top of your sketch:
-#include <Test.h>
-
-To stop using this library, delete that line from your sketch.
-
-Geeky information:
-After a successful build of this library, a new file named "Test.o" will appear
-in "Arduino/lib/targets/libraries/Test". This file is the built/compiled library
-code.
-
-If you choose to modify the code for this library (i.e. "Test.cpp" or "Test.h"),
-then you must first 'unbuild' this library by deleting the "Test.o" file. The
-new "Test.o" with your code will appear after the next press of "verify"
 
+https://www.airgradient.com/diy/