corrected version number

AirGradient.cpp

@@ -607,47 +607,27 @@ const char* AirGradient::getCO2(int retryLimit) {
   return Char_CO2;
 }
 int AirGradient::getCO2_Raw(){
-  int retry = 0;
-    CO2_READ_RESULT result;
-    const byte CO2Command[] = {0xFE, 0X44, 0X00, 0X08, 0X02, 0X9F, 0X25};
-    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())) {
-        retry++;
-        // 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);
-    }
+  _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();
-        if (byte == -1) {
-            result.success = false;
-            return -1;
-        }
-        CO2Response[i] = byte;
-    }  
-    int valMultiplier = 1;
-    int high = CO2Response[3];                      
-    int low = CO2Response[4];                       
-    unsigned long val = high*256 + low;  
-
+      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
+  }
 }
 
 //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

examples/C02_PM_SHT_OLED_WIFI/C02_PM_SHT_OLED_WIFI.ino

@@ -136,6 +136,7 @@ void loop() {
     Serial.println(httpCode);
     Serial.println(response);
     http.end();
+    delay(21000);
   }
 }
 

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);
+  }
+  }

library.properties

@@ -1,5 +1,5 @@
 name=AirGradient Air Quality Sensor
-version=1.4.1
+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.