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    BME280 Chip ID incorrect (multiple BME280 with SPI)

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    BME280 Chip ID incorrect (multiple BME280 with SPI)

    Hello!

    I am using BME280 with SPI, I have about 15 sensors attached to a custom board each with a CS pin. 

    When I am only attaching 1 BME280 sensor and only reading that sensor, the data output works just fine, however if I have multiple and tried reading, only 1 of them will be reading correctly and there doesn't seem to have any pattern in which one it will respond to.

    I started sending the signal directly to each sensor to check the value, and while I have 6 sensors on the board, 2 sensors (#3 and #4) has the correct chipID 0x60, while the four remaining ones have ID 0x40. 

    I have read through the other posts about incorrect chipID, and I have not found one that is applicable to me. 

    I went back to check and realized that all the failed BME280 reading all have chipID 0x40, can you advise on what might caused this and how I can resolve this?

    Thank you!

    Clare

     

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    Community Moderator
    Community Moderator

    Re: BME280 Chip ID incorrect (multiple BME280 with SPI)

    It would greatly help if you could confirm the SPI transactions with a logic analyzer or oscilloscope, to make sure they match the communication protocol.
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