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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
Well, something is wrong I'm afraid. You generally get 255 when there's no device connected at all.
It's possible you're using a breakout board that is designed for 5v operation, and Espruino only works at 3.3?