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by Sujan 2702 days ago
Anyone know other, possibly cheaper, devices besides https://www.co2meter.com/products/co2mini-co2-indoor-air-qua... that can display current CO2?

I hoped there would be cheaper versions on Aliexpress, but no luck :(
2 comments
Heliosmaster 2702 days ago
MH-Z19 is a sensor on sale on Aliexpress for ~20 USD. It works with Arduino and ESP32
link
blakesterz 2702 days ago
It looks like the same thing is cheaper on Amazon.
link