MQ-2 Gas Sensor Module🔥

The MQ-2 Gas Sensor Module is a robust, low-cost detector designed to sense smoke, butane, methane, propane, hydrogen, and other flammable vapors. Ideal for both electronics hobbyists and professional engineers, it integrates easily with Arduino, Raspberry Pi, and other microcontroller platforms for safety monitoring, leak detection, and environmental sensing.

⚙️ How It Works

The sensing layer is tin oxide (SnO2), which exhibits low conductivity in clean air. When exposed to combustible gases, its conductivity increases. The on-board circuitry converts this change into analog and TTL-level digital signals proportional to gas concentration, enabling straightforward interfacing with common electronics components and sensor modules.

⭐ Key Features

• High sensitivity to smoke, butane, methane, propane, hydrogen, and natural gas for precise and reliable measurements.
• Wide detection range suitable for multiple applications involving combustible gases.
• Easy integration with Arduino, Raspberry Pi, ESP32, STM32, and other microcontrollers via analog and TTL digital outputs.
• Durable design engineered for long-term stability and consistent performance.

🛠️ Technical Specifications

• Operating Voltage: 5 V
• Detection Concentration: 300–10,000 ppm
• Interfaces: Analog output (AO) and TTL-level digital output (DO)
• Response Time: < 1 s
• Heating Resistance (RH): 31 Ω ± 3 Ω
• Heater Current (approx.): ~160 mA at 5 V
• Heater Power (approx.): ~0.8 W

🔌 Compatibility & Integration

• Works seamlessly with Arduino, Raspberry Pi, and common microcontroller development boards.
• Analog output enables proportional gas concentration reading via an ADC.
• Digital (TTL) output provides a simple threshold-based alarm signal for quick detection.
• Recommended to allow an initial warm-up period for stable readings and to perform calibration in clean air for best accuracy.

🚀 Possible Applications

• Home and Industrial Safety: Detect gas leaks to help prevent accidents in residential and industrial environments.
• Environmental Monitoring: Incorporate into systems that track harmful or combustible gases.
• Gas Leak Detectors: Build portable or fixed detectors for commercial and residential use.
• Fire Safety Systems: Detect smoke and trigger alarms as part of early warning solutions.

📦 In the Box

• MQ sensor carrier board operating at 5 V with analog and TTL digital outputs for easy prototyping and integration.

📄 Datasheet