SCD-30 NDIR sensor measuring true CO2 concentration, temperature, and humidity over I2C. Uses non-dispersive infrared optics for accurate CO2 readings, not equivalent CO2 estimates.
Power input to onboard regulator
3.3V output from regulator
Common ground for power and logic
I2C clock, level shifted with 10K pullup
I2C data, level shifted with 10K pullup
Data ready output, high when data is ready
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| VIN | header / STEMMA QT | Power | Power input to onboard regulator | 3-5VDC |
| 3Vo | header | Power | 3.3V output from regulator | 3.3V output up to 100mA |
| GND | header / STEMMA QT | Ground | Common ground for power and logic | 0V |
| SCL | header / STEMMA QT | I2C | I2C clock, level shifted with 10K pullup | 3-5V logic |
| SDA | header / STEMMA QT | I2C | I2C data, level shifted with 10K pullup | 3-5V logic |
| RDY | header | Signal | Data ready output, high when data is ready | logic output |
Power input to onboard regulator
3.3V output from regulator
Common ground for power and logic
I2C clock, level shifted with 10K pullup
I2C data, level shifted with 10K pullup
Data ready output, high when data is ready
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, SCL, SDA, RDY. Schematik maps them to your board in the app.
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