MQ-2 Smoke LPG Butane Hydrogen Gas Sensor Detector Module

Overview

A gas sensor module that detects smoke, LPG, butane, hydrogen, and other combustible gases — commonly used in DIY safety/alarm projects.

Key Specs

Pinout

VCC, GND, AO (analog out), DO (digital out)

Features

• Adjustable sensitivity via onboard potentiometer
• Requires a brief warm-up period after power-on for stable readings

Compatible With

Arduino, ESP32, ESP8266, Raspberry Pi

Use Cases

• Gas leak alarm projects
• Air quality/smoke detection demos

FAQ

Does it need warm-up time? Yes — allow it a few minutes after power-on before trusting readings, as is typical for this sensor type.