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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.
@Gordon
@HughB has put an immense amount of work into the step counting algorithm, so I'd hope that should be pretty decent.
The heart rate sensor is the VC31. We actually use the code for auto-exposure adjustment that Vcare provide, but honestly it feels like that's the weak link right now. It can take quite a long time for it to adjust until it's providing decent PPG readings. After we get the readings we use our own algorithm but actually that's able to pull out heart rate pretty well.