MQ-2 Smoke Gas Sensor Module

MQ-2 Smoke Gas Sensor Module Overview

The MQ-2 Smoke Gas Sensor Module is a high-sensitivity gas detector built to detect smoke and a variety of flammable and toxic gases such as carbon monoxide (CO), methane (CH4), propane (C3H8) and hydrogen (H2). With a broad detection range and an analog output that maps to 0-5V, it is ideal for smoke alarms, air quality monitoring and DIY safety systems.

Key Features of MQ-2 Smoke Gas Sensor

• Detects smoke, CO, methane, propane and hydrogen with high sensitivity
• Wide detection range: 100 to 10,000 ppm for flexible monitoring
• Analog output (0-5V) proportional to gas concentration for easy measurement
• Fast response time (≤10 seconds) for prompt warnings
• Durable construction and long service life for reliable operation
• Simple 4-pin interface for plug-and-play integration with microcontrollers

Specifications

• Gases detected: Smoke, carbon monoxide (CO), methane (CH4), propane (C3H8), hydrogen (H2)
• Detection range: 100 to 10,000 ppm
• Operating voltage: 5V DC
• Output type: Analog (0-5V)
• Response time: ≤10 seconds
• Preheat time: ≥24 hours for stable and accurate readings
• Operating temperature: -20°C to +50°C
• Dimensions: approx. 32mm x 22mm x 27mm

Applications

• Smoke alarms and fire detection systems
• Home, office and industrial safety monitoring
• Air quality and environmental monitoring projects
• DIY electronics, robotics and smart home automation
• Prototype and product development for gas safety devices

Integration with Arduino, Raspberry Pi and Microcontrollers

The module provides a simple 4-pin interface for quick connection to controllers. Typical pinout:

• VCC: 5V power supply
• GND: Ground
• A0: Analog output (0-5V) proportional to gas concentration
• D0: Digital output (threshold switch on many modules) — check module variant

Basic Arduino example: connect A0 to an analog input (A0), read the voltage and convert to a relative gas level. Remember to allow the module to preheat for at least 24 hours before calibration for stable results.

Calibration and Best Practices

• Preheat the sensor for at least 24 hours before first use to stabilize readings.
• Calibrate in fresh air to determine a baseline sensor resistance or voltage.
• Use moving averages or threshold logic to filter noise and prevent false alarms.
• Avoid exposing the sensor to high humidity, dust and corrosive gases for prolonged periods.
• Implement periodic checks and replacements in critical safety systems.

Why Choose the MQ-2 Smoke Gas Sensor Module

The MQ-2 module combines affordability, wide-range detection and easy integration, making it a top choice for hobbyists, engineers and product designers building cost-effective smoke detection and air quality solutions. Its analog output and fast response time make it especially suitable for rapid alerting and continuous monitoring applications.

Note: Images are for illustration purposes only.