#include <MQ2.h>

//change this with the pin that you use
int pin_1 = A0;
int pin_2 = A1;
int pin_3 = A2;

int lpg_1, co_1, smoke_1;
int lpg_2, co_2, smoke_2;
int lpg_3, co_3, smoke_3;

MQ2 mq2_1(pin_1);
MQ2 mq2_2(pin_2);
MQ2 mq2_3(pin_3);

void setup()
{
  Serial.begin(9600);
  mq2_1.begin();
  mq2_2.begin();
  mq2_3.begin();
}

void loop()
{
  /*read the values from the sensor, it returns
  *an array which contains 3 values.
  * 1 = LPG in ppm
  * 2 = CO in ppm
  * 3 = SMOKE in ppm
  */
  //float* values_1= mq2_1.read(true); //set it false if you don't want to print the values in the Serial
 
  //lpg = values[0];
  lpg_1 = mq2_1.readLPG();
  lpg_2 = mq2_2.readLPG();
  lpg_3 = mq2_3.readLPG();
  //co = values[1];
  co_1 = mq2_1.readCO();
  co_2 = mq2_2.readCO();
  co_3 = mq2_3.readCO();
  //smoke = values[2];
  smoke_1 = mq2_1.readSmoke();
  smoke_2 = mq2_2.readSmoke();
  smoke_3 = mq2_3.readSmoke();

 if (lpg_1 > 10)
 {
    Serial.println(" Gas Leak Detected on Sensor 1");
    Serial.println("      ");
 }
 if (lpg_2 > 10)
 {
    Serial.println(" Gas Leak Detected on Sensor 2");
    Serial.println("      ");
 }
 if (lpg_3 > 10)
 {
    Serial.println(" Gas Leak Detected on Sensor 3");
    Serial.println("      ");
 }
  delay(1000);
}