Metal-oxide (MOX) gas sensor breakout using the ScioSense ENS161 for indoor air-quality monitoring, reporting TVOC, eCO2, and AQI over I2C. Requires a separate temperature/humidity source for best accuracy compensation.
One grouped connection is listed in the table but omitted from the graphic until individual pins are available.
Power input to onboard regulator; power with same voltage as microcontroller logic
3.3V output from onboard regulator
Common ground for power and logic
I2C data pin labelled SDI; also SPI serial data in
I2C clock pin labelled SCK; also SPI clock
Address select pin for I2C address change; also SPI serial data out
SPI chip select input
Interrupt output, can be pulled low on sensor reading thresholds
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| VIN | header / STEMMA QT | Power | Power input to onboard regulator; power with same voltage as microcontroller logic | 3-5V input |
| 3Vo | header | Power | 3.3V output from onboard regulator | 3.3V output up to 100mA |
| GND | header / STEMMA QT | Ground | Common ground for power and logic | 0V |
| SDASDI | header / STEMMA QT | I2C, Signal | I2C data pin labelled SDI; also SPI serial data in | 3-5V logic for I2C |
| SCLSCK | header / STEMMA QT | I2C, SPI | I2C clock pin labelled SCK; also SPI clock | 3-5V logic for I2C |
| SDO | header | Signal | Address select pin for I2C address change; also SPI serial data out | logic level |
| CS | header | SPI | SPI chip select input | logic level |
| INT | header | Signal | Interrupt output, can be pulled low on sensor reading thresholds | logic output |
One grouped connection is omitted from the graphic until individual pins are available.
Power input to onboard regulator; power with same voltage as microcontroller logic
3.3V output from onboard regulator
Common ground for power and logic
I2C data pin labelled SDI; also SPI serial data in
I2C clock pin labelled SCK; also SPI clock
Address select pin for I2C address change; also SPI serial data out
SPI chip select input
Interrupt output, can be pulled low on sensor reading thresholds
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: VIN, 3Vo, GND, SDA / SDI, SCL / SCK, SDO, CS. Schematik maps them to your board in the app.
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