MQ-2 Gas Sensor Module

GST

The MQ-2 Gas Sensor Module is used to detect LPG, propane, methane, hydrogen, and smoke in the air. It is widely used in gas leakage detection and safety systems with microcontrollers like Arduino Uno R3, Arduino Nano, and ESP32 Development Board.

The MQ-2 Gas Sensor Module is a widely used gas detection sensor capable of sensing flammable gases and smoke. It works using a tin dioxide (SnO₂) sensing material, whose resistance changes when exposed to combustible gases.

The module includes a comparator circuit (LM393) and provides both analog and digital outputs, allowing it to be easily interfaced with microcontrollers. A built-in potentiometer allows users to adjust the sensitivity level.

Due to its reliability and low cost, the MQ-2 sensor is commonly used in gas leakage alarms, safety monitoring systems, air quality monitoring, and smart home automation projects.

Key Features

Detects LPG, methane, propane, hydrogen, and smoke
Adjustable sensitivity using onboard potentiometer
Both analog and digital output
Onboard power and status LED indicators
Easy interface with Arduino and other microcontrollers
Fast response and high sensitivity

Technical Specifications

Parameter	Value
Operating Voltage	5V
Sensor Type	Gas / Smoke Sensor
Detection Gases	LPG, Methane, Propane, Hydrogen, Smoke
Output Type	Analog and Digital
Comparator IC	LM393
Preheat Time	~20 seconds