CO2meter: A Python interface to USB CO2 monitor devices

Re:CO2meter: A Python interface to USB CO2 monitor devices by Hasz on Friday April 03, 2020 @01:01AM (#22766415)

For $20, you can get the MH Z-19, which is a NDIR type. You can talk to it over UART, and it comes in a 5000ppm and 2000ppm model IIRC. Decent documentation, and a good little sensor.

The S8-0053 looks interesting, but I have no experience with it. Also NDIR, boasts +- 40ppm accuraxy -- the room air might not even be that homogeneous...

The cheap ones are electrochemical, and they're not even that cheap.

https://sandboxelectronics.com/files/SEN-000007/MG811.pdf

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Re:CO2meter: A Python interface to USB CO2 monitor devices by polskibus on Friday April 03, 2020 @09:37AM (#22768994)

Problem with it is that it autorecalibrates itself every 24hrs as far as I remember. It is a problem in room monitoring where you have constant high CO2- you'd have to take the sensor outside to fix it's reference level.

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