As a project at the University college of Odisee Energietechnologie (Belgium) we made 8 CO2 meters that indicate the quality of air and measure CO2.
The meter uses an IR-sensor, UNO, LCD and battery pack and auto-calibrates itself (each 24 hours or shorter).
With the link you'll find the code and a description of the hardware. We made a short documentation so that you have an idea about CO2 and Covid, and with some explanations about measuring of the Air quality. Included are also hardware and software, and we added some measurements with the 8 units that we built (we compare this with a reference CO2 meter).
I hope this might inspire you for other CO2 projects? Or maybe you just want to build one for yourself
If you have questions: feel free to ask.
self calibrating CO2 meter_compressed.pdf (415.6 KB)