BasicUsageMHZ19.ino

#define _DEBUG_1;

#include <Arduino.h>
#include "MHZ19.h"                                        
#include <SoftwareSerial.h> 

//
// FiWare
//
#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
#include <ArduinoJson.h>

const char* ssid = "SSID";
const char* password = "password";

// FiWare Config UL IoTAgent
const String host = "Stack FiWare Server UL";
const String port = "Stack FiWare Port UL";
const String apik = "Api Key FiWare Device Group";
const String deid = "Provision Device.id";

// FiWare POST URL
String urlpost = "http://"+host+":"+port+"/iot/d?k="+apik+"&i="+deid+"&getCmd=0";

// Peticiones WEB
HTTPClient http;

//
//
//

#define RX_PIN 14                                          // Rx pin which the MHZ19 Tx pin is attached to
#define TX_PIN 12                                          // Tx pin which the MHZ19 Rx pin is attached to
#define BAUDRATE 9600                                      // Device to MH-Z19 Serial baudrate (should not be changed)

MHZ19 myMHZ19;                                             // Constructor for library
SoftwareSerial mySerial(RX_PIN, TX_PIN);                   // (Uno example) create device to MH-Z19 serial

unsigned long getDataTimer = 0;
unsigned long DataTimer = 2 * 1000;
unsigned long getDataPost = 0;
unsigned long DataPost = 300 * 1000;

void setup()
{
    Serial.begin(9600);                                     // Device to serial monitor feedback

    mySerial.begin(BAUDRATE);                               // (Uno example) device to MH-Z19 serial start   
    myMHZ19.begin(mySerial);                                // *Serial(Stream) refence must be passed to library begin(). 

    myMHZ19.autoCalibration();                              // Turn auto calibration ON (OFF autoCalibration(false))

   // Conectar WiFi
   WiFi.begin(ssid, password);
   while (WiFi.status() != WL_CONNECTED) 
      delay(500); 

}

void loop()
{
    if (millis() - getDataTimer >= DataTimer)
    {
        int CO2; 
        double Temp;
        double Temp_1; 

        /* note: getCO2() default is command "CO2 Unlimited". This returns the correct CO2 reading even 
        if below background CO2 levels or above range (useful to validate sensor). You can use the 
        usual documented command with getCO2(false) */

        CO2 = myMHZ19.getCO2();                             // Request CO2 (as ppm)                               
        Temp_1 = myMHZ19.getTemperature(true);              // Request Temperature (as Celsius)
    
        #ifdef _DEBUG_
           Serial.print("CO2 (ppm): ");
           Serial.println(CO2);
           Serial.print("Temperature (Cº): ");
           Serial.println(Temp_1);
        #endif 
                                  
        getDataTimer = millis();

        // POST Fiware
        if (millis() - getDataPost >= DataPost){

          if(WiFi.status()== WL_CONNECTED){

            http.begin(urlpost);                                  			// Specify request destination    
            http.addHeader("Content-Type", "text/plain");         			// Specify content-type header
            http.addHeader("Fiware-Service", "<FiWare-Service>");      
            http.addHeader("Fiware-ServicePath", "<FiWare-Servicepath>");   
            int httpCode = http.POST("ppm|"+String(CO2)+"|temp|"+String(Temp_1));       // Send the request
            String payload = http.getString();
            http.end();
  
            // DEBUG
            #ifdef _DEBUG_
              Serial.print("POST Fiware: ");
              Serial.println(urlpost);
              Serial.print("HTTP POST Code: ");
              Serial.println(httpCode);
            #endif 

          }
                    
          //
          getDataPost = millis();
        }

    }
}