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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
@uname when you run the 'Heart Rate Monitor' app do you see the heart rate graph coming through properly?
Just checked and the BangleRun app defaults to 60bpm until it gets a reading, and it ignores readings that Bangle.js says it doesn't have confidence in.
The only thing I can think is I know BangleRun can take a while to update the screen, and I wonder whether the time it spends busy drawing the graphics is somehow affecting the HRM calculations