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Does anyone know of a cheap IoT type sensor for CO2? It can be any type, even RasberryPi or Arduino based. I'm not interested in sensors without connectivity op

Does anyone know of a cheap IoT type sensor for CO2? It can be any type, even RasberryPi or Arduino based. I'm not interested in sensors without connectivity options. About the levels, I'm working on an IoT project and I've seen data from a public school that has heating with radiators (so no real ventilation). One classroom with the sensor would routinely rise above 1000 ppm, with peaks over 3000ppm. Then you'd observe a sudden drop in CO2 level and temperature as they would open up a window. It's insane how high it can get especially if the building lacks proper ventilation.

benjaminRRR 7y ago
I bought this guy for the office - works well https://www.amazon.de/gp/product/B00TH3OW4Q https://www.amazon.de/gp/product/B00TH3OW4Q
Youden 7y ago
There are a bunch of raw sensor components that you can connect to an Arduino or Pi. I ended up going with the Sensirion SCD30 but also tested options from Amphenol's Telaire line. Both are pretty easy to communicate with using an Arduino. I haven't tested an MH-Z19 but that's a popular cheap option.