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    BME280 Ambient temperature and PCB temperature

    Established Member

    BME280 Ambient temperature and PCB temperature

    Hi all,

    I noticed that the temperature readings of the BME280 mounted on my PCB is highly affected by the temperature of the PCB that is always above 40°C.
    Is it possible to hestimate the correct ambient temperature?

    I also noticed that the humidity is very low (25% versus 65% measured by another sensor), may the heat of the PCB affect it?

    The pressure instead seems to be correct and very precise.

    Thank you
    Walter

    1 REPLY 1
    Community Moderator

    Re: BME280 Ambient temperature and PCB temperature

    Hi ,

    The BME280 is very sensitive to environment, so self-heating of PCB can influence the measurement.

    From HW side, you could keep BME away from component w/ significant self-heating effect, or isolate it, e.g. cut heat conduction via cooper. You could find the details in HSMI https://ae-bst.resource.bosch.com/media/_tech/media/application_notes/BST-BME280-HS006.pdf

    From SW side, you could measure the offset between BME and ambient, and subtract the offset in BME reading.  

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