Who can recommend a good CO2 sensor?
I am looking for a CO2 sensor that I can connect to my Wipy/Lopy.
Does anyone already have something like this running and can tell me which library to start with?
Many thanks in advance for your help.
I've had success with the Cozair sensors from Gas Sensing Solutions. At the time I started looking at CO2 sensors a couple of years ago they were pretty much one of the few and the lowest cost sensor. Now there are others available using the same technologies.
The sensor I have is now connected to a Lopy and Expansion board to provide regular readings via LoRa.
Note those CO2 sensors need to be calibrated regularly and assume a baseline of 400 ppm whether true or not. See specification.
CO2 sensors are expensive because they work by using the NDIR prinicple, which is more difficult to implement than sensors for more reactive gases (like CO). Check out the MH-Z14A or -Z19.
If you are after room air quality, there are air quality sensors ("VOC") that are less expensive.