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    Internal calibration for humidity, other parameters

    Internal calibration for humidity, other parameters

    mayor
    Established Member

    I have three BME680 sensors whose readings you can see below. They are in the same location, so I would expect readings to be within specified tolerances.

    You can see that the "yellow" sensor is off, especially with regards to humidity.

    I have not seen APIs to apply humidity calibration. Can this be done within the sensor, so that IAQ readings take it into account, and not as a post-reading calculation?

    Note the gas readings are also very different. 

    This isn't confidence-inspiring, but I am willing to try whatever is suggested here.

    Screen Shot 2022-01-21 at 6.37.31 AM.png

    5 REPLIES 5

    Minhwan
    Community Moderator
    Community Moderator

    Hello Mayor, 

     

    Firstly, if you are using BSEC 1.4.8.0, it's the humidity data you got is already calibrated. 

    You can check calc_humidity function in bme680.c  and it is used in BSEC. 

    And I saw your result and it's within our spec. 

    The accuracy tolerance is +-3% r.H.

    Thanks, 

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