How to Connect MQ2 Gas Sensor to Arduino © CC BY-NC-SA

MQ2 Sensor is a gas module and it is suitable to detect Hydrogen, LPG, Smoke, CO, and Alcohol. It has high sensitivity and fast response time to measure and take the data. Sensitivity can be adjusted by potentiometer behind it:

Circuit

MQ2 Connections with Arduino:

MQ2 Connections with Arduino and IIC LCD Display:

Connections

Arduino              MQ2

• AO                       A0

• 5V                     VCC

• GND                   GND

Code

• Download MQ2 Library

• Download I2C LCD Display Library

Watch Video

For more projects and tutorials visit our website.