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    BM280 stability

    Member

    Re: BM280 stability

    Don‘t even bother further with this design approach. It will never work.

    If you need to revise your PCB anyway dot it right with a differential sensor.

    My educated guess is that your two sensors are not on the same PCB but one is located within the box and the other outside because the Bosch sensors do not have hose connectors. This maens it is likely that either the power supply or the ambient temperature of both sensors vary when you switch on the fans. The imperfections of the temperature compensation for absolute pressure sensors alone easily explains the diverging of the measurements.

    Contributor

    Re: BM280 stability

    hor63's point of view is a bit extreme. One thing Johanan forgot to mention was the required accuracy of the system.

    If indeed the sensor system needs to detect a 10-50Pa signal, then yes this is feasible. If the sensor system needs to accurately measure it, not so much.

    In a previous test comparing 2 BMP388 sensors output at rest over 2 days, I observed a typical deviation (68%) within +-3.2 Pa, and a maximum deviation (99.7%) within +-9Pa.

    Therefore, I would go on to say that using 2 BMP388 absolute pressure sensor, you can detect a signal greater than 10 Pa with few false negatives.

    o_o
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