Components Required:

Arduino Uno

MQ-2 (LPG Sensor)

Jumper Wires

Theory:

Connect the D0 pin of MQ5 module to any digital pin of arduino. Lets connect D0 to pin 7 of arduino. Now we need to give power supply (Vcc) and complete the circuit by connecting to ground (Gnd). Refer the circuit diagram given below. Take a +5V connection from arduino and connect it to Vcc of MQ5 module. Finally connect the GND pin of MQ5 module to GND of arduino.

Connection :

Code:

int sensor=7; int gas_value; void setup() { pinMode(sensor,INPUT); Serial.begin(9600); } void loop() { gas_value=digitalRead(sensor); Serial.println(gas_value); }