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

Oh that's not too bad, mine looks like this: https://imgur.com/a/7weijF7 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. :-)