SCD30 - NDIR CO2 Sensor - STEMMA QT, Qwiic

The SCD-30 is an NDIR sensor, which is a 'true' CO2 sensor, that will tell you the CO2 PPM (parts-per-million) composition of ambient air. Perfect for environmental sensing, scientific experiments, air quality and ventilation studies, and more.

Data is read over I2C, so it works very nicely with just about any microcontroller or microcomputer. Adafruit has written both Arduino and Python/CircuitPython code so you can get started in a jiffy.

Another nice element to this sensor is it comes with an SHT31 temperature and humidity sensor already built-in. The sensor is used to compensate the NDIR CO2 sensor, but it's also readable so you get full environmental data.

More information is available on the website of Adafruit.