This is a simple library to use with the MQ-2 sensor in arduino.

Based on this page: Sandbox electronics

The following page it's also useful if you want to know how to calibrate the sensor (it's for MQ-6 sensor but it works as the MQ-2 does): http:https://www.savvymicrocontrollersolutions.com/index.php?sensor=mq-6-gas-sensors

To intall the library to use it with the Arduino IDE, download it as zip and unzip it into your 'libraries' folder and restart the Arduino IDE.

Setup:

  #include <MQ2.h>
  
  int pin = A0;
  
  MQ2 mq2(pin);
  
  void setup(){
    mq2.begin();
  }

Read all data:

  float* values = mq2.read(true); //true to print the values in the Serial

Read specific data:

  float lpg = mq2.readLPG();
  
  float co = mq2.readCO();
  
  float smoke = mq2.readSmoke();