The SCD41 from Sensirion is a high quality Photoacoustic based CO₂ sensor capable of detecting 0 to 40000ppm with high accuracy over 400-5000ppm ±(40ppm+5%). In order to improve accuracy the SCD41 has integrated temperature and humidity sensing built-in. For additional accuracy the SCD41 also accepts ambient pressure readings!
We’ve written an Arduino library to make reading the CO₂, humidity, and temperature very easy. It can be downloaded through the Arduino Library manager: search for ‘SparkFun SCD4x’ or it can be found in the Documents tab above.
Note: The SCD41 has an automatic self-calibration routine. Sensirion recommends 7 days of continuous readings with at least 1 hour a day of ‘fresh air’ for self-calibration to complete.
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* [SCD41 Datasheet](https://cdn.sparkfun.com/assets/d/4/9/a/d/Sensirion_CO2_Sensors_SCD4x_Datasheet.pdf)
* [Eagle Files](https://cdn.sparkfun.com/assets/1/6/a/1/e/Qwiic-CO2_Sensor-SCD40_Eagle_Files.zip)
* [Arduino Library](https://github.com/sparkfun/SparkFun_SCD4x_Arduino_Library)
* [Hardware repo](https://github.com/sparkfunX/Qwiic_CO2_Sensor-SCD4x)