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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
The I2C timeout is when it's not able to communicate with the module over I2C.
So...
I2C3withI2C3.setup(...)?Vinnot 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?