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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.
user143355
@Sir_Indy
I installed the SleepLog app yesterday, that says it uses the internal temperature sensor to help identify if it's on a wrist, there might be something in that app you could reuse rather than start from scratch.