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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
Great, glad that helped for you! As you say I think on the Bangle the increased power usage is pretty marginal.
Interesting about the calibration, thanks! It's just anecdotal from the other devices I sell like Puck.js that don't have an XTAL, they don't seem to drift off loads over time - I run some in the garden the whole summer and they've never drifted off by enough that I notice anything (so must be less than half an hour).