Pimoroni breakout for the MICS6814 multi-gas sensor detecting CO, NO2, and NH3 simultaneously using three independent metal-oxide sensing elements. Requires a warm-up period before readings are valid.
Raspberry Pi 3.3V power rail; breakout accepts 3V to 5V
I2C data; default I2C address 0x19
I2C clock
Auxiliary Breakout Garden/Raspberry Pi compatible signal position
Ground
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| 3V3 | 1x5 header, Raspberry Pi physical pin 1 | Power | Raspberry Pi 3.3V power rail; breakout accepts 3V to 5V | 3V to 5V compatible |
| SDA | 1x5 header, Raspberry Pi physical pin 3 | I2C | I2C data; default I2C address 0x19 | I2C logic |
| SCL | 1x5 header, Raspberry Pi physical pin 5 | I2C | I2C clock | I2C logic |
| GPIO4 | 1x5 header, Raspberry Pi physical pin 7 | GPIO | Auxiliary Breakout Garden/Raspberry Pi compatible signal position | logic level |
| GND | 1x5 header, Raspberry Pi physical pin 9 | Ground | Ground | 0V |
Raspberry Pi 3.3V power rail; breakout accepts 3V to 5V
I2C data; default I2C address 0x19
I2C clock
Auxiliary Breakout Garden/Raspberry Pi compatible signal position
Ground
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: 3V3, GND, SDA, SCL, GPIO4. Schematik maps them to your board in the app.
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