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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
Sorry for the delay - I think things are basically all answered now, but just to clear up:
Turning bluetooth off in settings really does mean no bluetooth transmission on a default watch unless you totally reboot it or install apps that use BLE for something else.
@Ganblejs basically hit this spot on in the last post:
The 'health' app records HRM every 10 minutes, and that period is hard-coded into the file format (it just keeps all entries, because you could store ~30 years worth using the onboard flash)
If you want it faster, I think what you really want is the
recorderapp which can record not just HRM/steps at any rate you want, but other stuff too like GPS coordinates or altimeter values. If you wanted to make something that looked at accelerometer values, detected exercise and then turned the recorder on and off automatically then that might actually be a really neat addition (and not that hard at all)