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See http://forum.espruino.com/conversations/372681/#16388080
I try to put together a summery of the current state (promised this a while ago) later this evening or tomorrow.
Best thing to start is to use "HRM Accelerometer event recorder" App to record the raw sensor data, ideally together with some reference from a bluetooth belt. This writes csv, so you can look and analyse with whatever tool/language you prefer.
Also you can use this script as example and see how to get all the relevant values.
Mi
I think I am just completely missing this but where is the heart rate data actually getting called from? I am looking at heart/app.js and I am not seeing the call to either subscribe to the event or get the data. Everything I am seeing looks more like logging data and drawing the graphs.
I'd like to help try to improve this if I can. I am mostly self-taught so I just need a bit of direction if possible. Thank you.