MQ-2 Gas Sensor Module Smoke, LPG, Methane, and Hydrogen Detection

MQ-2 Gas Sensor Module – Smoke, LPG, Methane, and Hydrogen Detection

The MQ-2 Gas Sensor Module is a versatile and reliable smoke and gas detection sensor used to sense the presence of flammable gases like LPG, methane (CH₄), butane, hydrogen (H₂), propane, and smoke. It is widely used in gas leak detection systems, fire safety alarms, and smart home environmental monitoring.

This sensor is based on a sensitive tin dioxide (SnO₂) semiconductor layer, which changes resistance in response to gas concentration. Designed for compatibility with platforms like Arduino, ESP32, and Raspberry Pi, the MQ-2 module offers both analog and digital outputs for flexible integration into your projects.

The MQ-2 Sensor Module is designed for reliable detection of smoke, LPG, methane, butane, and other flammable gases. With both analog and digital outputs, it’s ideal for integrating into DIY electronics, fire safety alarms, and smart home automation systems.

Applications:

• Gas leakage detection in kitchens or gas stations

• Fire detection and smoke alarms

• Smart home safety systems

• Air quality monitoring in industrial zones

• Educational and DIY electronics projects

• IoT-enabled home automation systems

Features:

• High sensitivity to flammable gases and smoke

• High-quality double-layer PCB design

• Adjustable detection threshold via onboard potentiometer

• Built-in power indicator LED and TTL signal output LED

• Dual analog and digital outputs for flexible use

• Dual output:

  • Digital Output (DO): TTL level, active low

  • Analog Output (AO): Voltage increases with gas concentration

• Compatible with microcontrollers and relay modules

• Excellent sensitivity to:

  • Liquefied petroleum gas (LPG)

  • Natural gas

  • City gas

  • Smoke

• Quick response and recovery time

• Stable and long-lasting performance

• Four screw mounting holes for easy installation

• Compact and durable design

• Long lifespan and low power consumption

• Easy integration with microcontrollers and IoT platforms

• Ideal for real-time gas leakage alerts

Specifications:

• Sensor Type: MQ-2 (Semiconductor gas sensor)

• Load Resistance (RL): Adjustable via onboard potentiometer

• Detectable Gases: LPG, methane, butane, hydrogen, smoke, propane

• Preheat Time: 20 seconds (typical)

• Operating Temperature: -10°C to +50°C

• Humidity Range: 20% – 90% RH (non-condensing)

• Operating Voltage: 5V DC

• Power Consumption: ~150mA

• Digital Output: 0V (LOW) or 5V (HIGH)

• Analog Output Voltage Range:

  • 0.1–0.3V (clean air)

  • Up to ~4V (high gas concentration)

• Sensor Type: FC-22 module

• LED Indicators:

  • DO-LED: Lights up when threshold is exceeded

  • PWR-LED: Indicates power status

• Module Size: 32mm x 20mm x 22mm

Wiring:

• VCC: Connect to +5V DC power supply

• GND: Ground

• DO: Digital signal output (TTL logic)

• AO: Analog voltage output

For advanced implementation, check the full datasheet.