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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.
@adjtm
What are the recommended/tested external HR sensors for bangle.js 2? It seems that the recent cutting edge firmware (2v17.55) improved the internal HR accuracy, but I'd like to try an external one for running training.