Analog MEMS gas sensor breakout for indoor CO, natural gas, and VOC detection with a single analog output. Suitable for air-quality monitoring and early fire detection. Requires calibration and warm-up time before readings are stable.
Power input for sensor/heater
Ground
Analog voltage output proportional to detected gas
Heater/sensor enable, pull high to 5V to turn off
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| 5V | header | Power | Power input for sensor/heater | 5VDC |
| GND | header | Ground | Ground | 0V |
| AOUT | header | Analog | Analog voltage output proportional to detected gas | analog output |
| EN | header | Control | Heater/sensor enable, pull high to 5V to turn off | 5V logic |
Power input for sensor/heater
Ground
Analog voltage output proportional to detected gas
Heater/sensor enable, pull high to 5V to turn off
I2C · Analog · UART · 3.3 – 5 V · Breakout
Waveshare lists MQ-2 for combustible gases and smoke, MQ-3 for alcohol, and MQ-135 for mixed indoor pollutants such as NH3, NOx, alcohol,…
Module pins: 5V, GND. Schematik maps them to your board in the app.
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