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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.
@stewartg
Yes, but I think heart rate measurement will be very useful in this application. Unless of course its wildly inaccurate, in which case I could afford to lose the window. Another option is a big piezo with a small hole in the middle. Not sure how well that would work.