Hi @NT1, interesting, was there anything contextually noteworthy surrounding this change in behavior? I just downloaded the last 5 hours of data. and it's not entirely flat-lining, there was some kind of spike from 943 ppm to 1252 ppm at around noon eastern time today, but it's been flat at 943 for the last few hours, which is strange. The temperature and humidity reports seem to be exhibiting normal variation... It might be worth looking at the serial monitor output to see if anything unusual is being printed to the screen that might indicate a hardware fault. You might also try breathing into it heavily for a minute to see if the CO2 numbers shoot up.
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