This Arduino library provides support for the 7Semi-SCD4x (SCD40/SCD41) sensor module over I2C. It enables real-time measurement of CO₂ (ppm), temperature (°C), and humidity (%), and supports both continuous and single-shot measurement modes. The library also includes CRC8 validation and optional data-ready status polling.
- 7Semi SCD40 or SCD41 sensor module
- Arduino-compatible board
- I2C connection (SDA, SCL)
- Download or clone the repository.
- Copy the files `7semi_scd4x.cpp` and `7semi_scd4x.h` into a folder named `7semi_HMC6343` under your Arduino `libraries/` directory.
- Restart the Arduino IDE.
| SCD4x Pin | Arduino Pin |
|---|---|
| SDA | A4 (Uno) |
| SCL | A5 (Uno) |
| VCC | 3.3V / 5V |
| GND | GND |
Default I2C address:
0x62
