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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.
@Robin
Just did some digging, and it will be imperative to watch those voltages:
Voltage dividers and level shifters are very likely to be required. I'd even consider opto-isolation as a better alternative as a dual chip is well under $1 USD