• do you think my approach of using Date.now()-timePast>100 for sampling rate is efficient or you recommend any other way?

    That'll be ok but it wouldn't give exactly 10Hz since you're sampling only when the delay is 100ms or more - but the HRM by default runs at 25Hz, so you might get steadier readings by just averaging two readings. It'd give you 12.5Hz but it'd be better to stay at that than to drop samples and get 10ish Hz.


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