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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.
@Fteacher
As far as I remember, .fit is well documented but proprietary format. My Garmin watch uses it and I like that it gives infos about heart rate zones directly to the app I use for my running data. But I'm ok to sacrifice that to have a free format file.