• By the module having pullup resistors, I meant the actual BMP280 :)

    You won't need pinMode, no... it's done automatically by software I2C.

    Honestly I'm not sure why it wouldn't be changing - it could be something to do with the way it is initialised in https://github.com/espruino/EspruinoDocsĀ­/blob/master/devices/BMP280.js - are you used to looking around in the datasheets. I guess they might give you some clue...

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