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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.
@myownself
I also care about the open, and heart rate monitoring is one of the main features I am after in a watch so when I get one I will also be looking at heart rate and also some of the more novel features we can extract.
I have looked at a lot of papers. I remember one was a particularly good overview, I will see if I can dig it out again @Mi.