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  • The I2C timeout is when it's not able to communicate with the module over I2C.

    So...

    • Did you set up I2C3 with I2C3.setup(...)?
    • Is it powered properly? Looks like it needs connecting up with Vin not 3.3v.

    Finally, try adding some 10k pull-up resistors. the Adafruit page doesn't mention that it has them and I think some Arduino boards to have them on so they may have left them off of the adaptor board?

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