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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
In the "read more" section of "Bluetooth Heart Rate Monitor" app, in the app loader, you'll see that it works with these ones:
I'm using the Polar OH1+ to run, for almost 2 years: it works just fine.