Gas & Air Quality SensorsCompatible
MQ-2 Gas & Smoke Sensor Module
Gas sensor module that reacts to LPG, propane, methane, hydrogen and smoke. Analog output for levels and a digital alarm output with adjustable threshold – build gas-leak and smoke alarms.
- Sensor
- MQ-2 (SnO2)
- Detects
- LPG, propane, methane, hydrogen, alcohol, smoke
- Detection Range
- About 300–10,000 ppm
- Supply Voltage
- 5 V DC
- Heater Current
- About 150 mA
- Outputs
- Analog (AO) + digital (DO, adjustable)
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Specifications
- Manufacturer Part Number
- MQ-2
- Sensor
- MQ-2 (SnO2)
- Detects
- LPG, propane, methane, hydrogen, alcohol, smoke
- Detection Range
- About 300–10,000 ppm
- Supply Voltage
- 5 V DC
- Heater Current
- About 150 mA
- Outputs
- Analog (AO) + digital (DO, adjustable)
- Comparator
- LM393
- Warm-up Time
- 1–2 min (24 h burn-in on first use)
- Pins
- VCC, GND, DO, AO
Description
The MQ-2 uses a heated tin-dioxide element whose resistance falls when combustible gas or smoke is present. The module turns that into an analog voltage and, through an LM393 comparator, a digital alarm signal you can set with the trimpot.
Features
- Detects LPG, i-butane, propane, methane, hydrogen, alcohol and smoke (about 300–10,000 ppm)
- Analog output (AO) proportional to gas concentration
- Digital output (DO) with adjustable threshold and indicator LED
- 5 V supply; the heater draws about 150 mA
- 4 pins: VCC, GND, DO, AO
Good to know
Let a new sensor burn in for 24 hours on first use, and allow 1–2 minutes of warm-up each time it's powered. The sensor gets warm – that's normal. It shows relative levels; for exact ppm readings it needs calibration. It is a hobby/learning sensor, not a certified safety device.
Package includes
1 × MQ-2 gas sensor module