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vincent.vandeputte.60@gmail.com

/*This test code is write for Arduino AVR Series(UNO, Leonardo, Mega)

  If you want to use with LinkIt ONE, please connect the module to D0/1 and modify:

  // #include <SoftwareSerial.h>

  // SoftwareSerial s_serial(2, 3);      // TX, RX

  #define sensor Serial1

*/

#include <SoftwareSerial.h>

SoftwareSerial s_serial(2, 3);      // TX, RX

#define sensor s_serial

const unsigned char cmd_get_sensor[] =

{

    0xff, 0x01, 0x86, 0x00, 0x00,

    0x00, 0x00, 0x00, 0x79

};

unsigned char dataRevice[9];

int temperature;

int CO2PPM;

bool dataRecieve(void)

{

    byte data[9];

    int i = 0;

    //transmit command data

    for(i = 0; i < sizeof(cmd_get_sensor); i++)

    {

        sensor.write(cmd_get_sensor[i]);

    }

    delay(10);

    //begin reveiceing data

    if(sensor.available())

    {

        while(sensor.available())

        {

            for(int i=0;i<9; i++)

            {

                data[i] = sensor.read();

            }

        }

    }

    if((i != 9) || (1 + (0xFF ^ (byte)(data[1] + data[2] + data[3] + data[4] + data[5] + data[6] + data[7]))) != data[8])

    {

        return false;

    }

    CO2PPM = (int)data[2] * 256 + (int)data[3];

    temperature = (int)data[4] - 40;

    return true;

}

// Example testing sketch for various DHT humidity/temperature sensors

// Written by ladyada, public domain

#include "DHT.h"

#define DHTPIN A0     // what pin we're connected to

// Uncomment whatever type you're using!

//#define DHTTYPE DHT11   // DHT 11 

#define DHTTYPE DHT22   // DHT 22  (AM2302)

//#define DHTTYPE DHT21   // DHT 21 (AM2301)

// Connect pin 1 (on the left) of the sensor to +5V

// Connect pin 2 of the sensor to whatever your DHTPIN is

// Connect pin 4 (on the right) of the sensor to GROUND

// Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor

DHT dht(DHTPIN, DHTTYPE);

void setup() 

{

    Serial.begin(115200); 

    Serial.println("DHTxx test!");

    dht.begin();

    sensor.begin(9600);

    Serial.begin(115200);

    Serial.println("get a 'g', begin to read from sensor!");

    Serial.println("********************************************************");

    Serial.println();

}

void loop() 

{

    // Reading temperature or humidity takes about 250 milliseconds!

    // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)

    float h = dht.readHumidity();

    float t = dht.readTemperature();

    // check if returns are valid, if they are NaN (not a number) then something went wrong!

    if (isnan(h)) 

        Serial.println("Failed to read from DHT");

    else 

    {

      if(dataRecieve())

      {

          Serial.print("{");Serial.print(t);Serial.print(",");Serial.print(CO2PPM);Serial.print(", ");Serial.print(h);Serial.println("}|");

      }

      else 

        Serial.println("Failed to read from MH-Z16");

    }

    delay(1000);

}