MQ-2 gas sensor

https://arduinoshoppen.dk/produkt/mq-2-roeg-butan-hydrogen-sensor-roegdetektor/

https://www.keyestudio.com/free-shipping-keyestudio-mq-2-combustible-gas-and-smoke-for-arduino-p0117.html

Introduction

This sensor is suitable for detecting LPG, I-butane, propane, methane, alcohol, Hydrogen and smoke. It has high sensitivity and quick response. In addition, the sensitivity can be adjusted by the potentiometer.

Specification

Power supply: 5V

Interface type: Analog

Wide detecting scope

Quick response and High sensitivity

Simple drive circuit

Stable and long lifespan

Sample code:

void setup()

{

Serial.begin(9600); //Set serial baud rate to 9600 bps

}

void loop()

{

int val;

val=analogRead(0);//Read Gas value from analog 0

Serial.println(val,DEC);//Print the value to serial port

delay(100);

}