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    BME680 strange IAQ-Index in classroom

    sciencegirl
    New Poster

    BME680 strange IAQ-Index in classroom

    Hello,

    I used the BME680 with the calculation into the IAQ-Index in a classroom. At the same time I meassured the CO2 value with another sensor in the classroom. Afterwards I made an history chart, which I attached, with both values and everytime the windows had been opened the CO2 value drops and the IAQ-Index increases. Normaly the IAQ-Index should also drop, shouldn't it? Could the time filters and the algorithm in the BME680 be the reason for this strange behavoir? Or is there another reason? Is there anyway I can fix it?

    Thanks alot in advance.

    Tags (1)
    2 REPLIES 2
    BSTRobin
    Community Moderator

    Re: BME680 strange IAQ-Index in classroom

    Hi sciencegirl,

    Did the sensor run for total about 4 hours from power on to end of test? How does the accruracy value of the BSEC output change?

    sciencegirl
    New Poster

    Re: BME680 strange IAQ-Index in classroom

    Hey,

    it ran for several days. The accuracy value was on 3 calibrated the whole time. I also tried it at home and always when I opended the window the same thing happend. I'm using the sensor with the ESPHome software and the bsec library.

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