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FWIW, this is my current temperature/CO2 plot: https://imgur.com/a/LhUoPcS

The temperature graph is pretty easy to understand as you see the A/C kick on twice during the day. The CO2 level is maybe not as obvious but I can see when I was in this room and when I closed the window when I was leaving.



Oh that's not too bad, mine looks like this: https://imgur.com/a/7weijF7 with a sampling rate of 1Hz, without smoothing.

As another poster pointed out, with automatic background calibration and opening the windows daily it doesn't get too out of whack.

Out of curiosity, do you have any more details on how you built yours, I'm curious to see how you have done things differently from mine. :-)


I imagine co2 not being perfectly mixed and maybe wafts of it hitting the sensor? The overal trend is clear though. Try transforming the data with a moving hour average or something.




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