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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
As @HughB says, you can log all the time.
Right now the heart rate monitor still uses a reasonably high amount of power (it can flatten the battery in ~2 days if fully on) so to eke out the battery a bit more we only turn it on for a minute of so every 10 minutes - but it should get better with a software update.