Thanks, I can see some common behaviour if some alcohol is put inside the room or when the cleaning is undergoing or when I open the door. But it's not easy to see the confrontation of the TVOC and the BME680. This is because the TVOC we have can't be connected to the logger (it's my microprocessor that register the data) and the TVOC we have can't be connected in any way. And the TVOC turn off in some minutes. While it takes 2 minutes or more to turn on. The problem is that if I take 2 sensors connected to 2 different microprocessors (with the same firmware) I can see different values for the VOC from the Logger. This is the worst problem. I'm trying to understand if the sensors has been damaged during the soldering phase or why since they has been turned on on the same time and the 2 microprocessors have the same firmware. To better understand the problem I can show the log file of 2 sensors. The issue of the inizilization has been corrected (now the inizialization is correctly set for 3s and 3,3V supply as should be). I have turned the 2 sensor on at 13.00 pm. They are placed in a room that during the day (after 8.00 am) have a window open and afer 17.00 I close the window (so no fresh air is available) but I open the door that connect to the rest of the company in order to avoid a too static air. Usually after 17.30 the cleaning of the company is undertaking and so it's normal that the VOC increase. You can see from the tab on the lowest part of the window the values that are completely different. In one case the VOC reach a peak of 120000 ppb (120ppm) In the second case the VOC reach a peak value of 6000 ppb (6ppm) The 2 sensors are placed 50cm one from another, so they should have the same values... or something similar Even CO2 have a peak of different values, but one sensor reach a value wich is "only" double the value of the other (2000 vs 4000) This is the worst problem for me. If a customer put 2 board at a short distance and see 2 values that are so different for VOC (one is 20 times the other) will ask me "why? is one sensor broken?" Is this difference connected only to the first hours of inizialization? The logger register even the Gas resistance, the temperature, the umidity, the pressure, and alla the raw data and you can see from the excel table (the tab on the bottom of the excel window select the sensor). I will try to confront with the TVOC but I will have some difficulties in doing this Thanks, Cristian
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