MQ-2 Gas Sensor Module For H2, LPG, CH4, CO, Smoke or Propane Detector Module

The MQ-2 Gas Sensor Module is a highly sensitive gas and smoke detection sensor widely used in safety monitoring, industrial automation, environmental monitoring, and smart home applications. It can detect various combustible gases including LPG, Propane, Methane (CH4), Hydrogen (H2), Carbon Monoxide (CO), and Smoke, making it one of the most versatile gas sensors available.

The module features an onboard LM393 comparator, adjustable sensitivity control, and both analog and digital outputs, allowing easy integration with Arduino, ESP32, ESP8266, Raspberry Pi, STM32, and other development platforms.

Whether you're building a gas leak alarm, smart safety system, industrial monitoring device, or IoT-based gas detection project, the MQ-2 sensor provides reliable and cost-effective performance.

Key Features
Detects LPG, Propane, Methane (CH4), Hydrogen (H2), Carbon Monoxide (CO), and Smoke
High sensitivity to combustible gases
Analog and digital output support
Adjustable detection threshold
Fast response and recovery time
Built-in LM393 comparator circuit
LED indicators for power and output status
Compatible with 3.3V and 5V microcontrollers
Easy to interface with Arduino, ESP32, ESP8266, and Raspberry Pi
Suitable for home, industrial, and IoT applications
Technical Specifications
Sensor Type: MQ-2 Gas Sensor
Operating Voltage: 5V DC
Output Type: Analog (AO) and Digital (DO)
Detection Gases:
LPG
Propane
Methane (CH4)
Hydrogen (H2)
Carbon Monoxide (CO)
Smoke
Sensitivity: Adjustable via onboard potentiometer
Comparator IC: LM393
Preheating Time: Recommended before accurate readings
Response Time: Fast
Operating Temperature: -20°C to +50°C
Applications
Gas Leakage Detection

Detect LPG and propane leaks in homes, kitchens, and commercial facilities.

Smoke Detection Systems

Build smoke alarm and fire warning systems.

Industrial Safety Monitoring

Monitor hazardous gases in factories, workshops, and warehouses.

Smart Home Automation

Integrate gas detection into smart home safety systems.

IoT Monitoring Projects

Send real-time gas concentration alerts to cloud platforms using ESP32 or ESP8266.

Environmental Monitoring

Measure air quality and detect harmful gas concentrations.

Educational Projects

Ideal for learning gas sensing technology and embedded system development.

Pin Configuration
VCC – 5V Power Supply
GND – Ground
AO – Analog Output
DO – Digital Output
Package Includes
1 × MQ-2 Gas Sensor Module
Why Choose the MQ-2 Gas Sensor Module?

The MQ-2 Gas Sensor is one of the most trusted and widely used gas detection sensors for electronics and IoT projects. Its ability to detect multiple combustible gases, adjustable sensitivity, and simple integration make it an excellent choice for safety, automation, and monitoring applications.

Whether you're building a gas leak detector, smoke alarm system, industrial safety monitor, or smart IoT project, the MQ-2 provides dependable gas detection performance at an affordable price.