Smoke Sensor Module – MQ-2

The MQ-2 gas sensor module is capable of detecting a range of gases including smoke, LPG, methane, hydrogen, and propane. It uses a tin dioxide (SnO₂) semiconductor sensing layer which changes resistance based on gas concentration. Widely used in fire detection and gas leakage warning systems.

Key Features:

• Sensor Type: Semiconductor (SnO₂)
• Target Gases: Smoke, LPG, methane, propane, hydrogen, alcohol
• Operating Voltage: 5V DC
• Analog Output: Voltage increases with gas concentration
• Digital Output: TTL signal via onboard comparator
• Preheat Time: ~20 seconds
• Detection Range: 200 – 10,000 ppm (combustible gases)
• Adjustable: Potentiometer to set sensitivity threshold

Applications:

• Smoke detectors
• LPG and gas leak alarms
• Fire detection systems
• Microcontroller-based gas monitoring projects

📄 View Verified Datasheet (PDF)