MQ-2 Gas & Smoke Sensor Module LPG Methane Hydrogen for Arduino ESP32

MQ-2 Gas & Smoke Sensor Module – LPG, Methane & Hydrogen Detection for Arduino & ESP32

The MQ-2 Gas and Smoke Sensor Module is a versatile electrochemical sensor capable of detecting a wide range of combustible gases and smoke in the surrounding environment. It provides both analog (AO) and digital (DO) output signals, making it easy to integrate with any microcontroller platform.

Key Specifications

• Detectable Gases: LPG, Methane (CH₀), Hydrogen (H₀), Smoke, Alcohol, Propane, Butane
• Output: Analog (AO) + Digital (DO) with adjustable threshold
• Operating Voltage: 5V DC
• Preheat Time: ~20 seconds
• Detection Range: 300–10,000 ppm
• Onboard Potentiometer: Adjustable sensitivity threshold
• Indicator LEDs: Power and alarm LEDs onboard

Compatibility & Use Cases

The MQ-2 module is fully compatible with Arduino, ESP32, NodeMCU, and Raspberry Pi via both analog and digital interfaces. Common applications include:

• Home gas leak detection and alarm systems
• Industrial air quality monitoring nodes
• IoT-connected smoke and fire alert systems
• Kitchen safety and LPG leak detectors
• STEM and engineering project demonstrations

Connect AO to an ADC pin for concentration readings, or use DO with a digital GPIO for simple threshold-based alerts.

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