Sensirion SGP41 multi-pixel MOX gas sensor breakout measuring VOC and NOx indices over I2C. Requires a separate humidity and temperature reading fed to the sensor's compensation algorithm for accurate results.
Common ground for power and logic
Onboard 3.3V regulator output
Board power input, use same voltage as host logic
I2C data line with level shifting and 10K pullup
I2C clock line with level shifting and 10K pullup
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| GND | breakout header / STEMMA QT ground | Ground | Common ground for power and logic | 0V |
| 3.3V | breakout header | Power | Onboard 3.3V regulator output | 3.3V output, up to 100mA |
| VIN | breakout header | Power | Board power input, use same voltage as host logic | 3V to 5V |
| SDA | breakout header / STEMMA QT | I2C | I2C data line with level shifting and 10K pullup | 3V to 5V logic |
| SCL | breakout header / STEMMA QT | I2C | I2C clock line with level shifting and 10K pullup | 3V to 5V logic |
Common ground for power and logic
Onboard 3.3V regulator output
Board power input, use same voltage as host logic
I2C data line with level shifting and 10K pullup
I2C clock line with level shifting and 10K pullup
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: GND, 3.3V, VIN, SDA, SCL. Schematik maps them to your board in the app.
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