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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.
@HughB
Have you gone into settings and set heart rate tracking to 10mins instead of the default which is off.
After a hour you should see a value in the hour graph. Takes a day to log a days data for the day graphs to work.