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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
Very interesting - thanks! I've just pushed an update that lowers expected accuracy to 50ppm when using an external crystal - I'd be really interested to see if that solves your connection problems.
Sorry to hear that Bangle's so far off though - I'm not sure how the crystal used ended up being so out of range.
One option might actually be to not use the xtal on that watch. Then it'll calibrate using the high speed one which might actually end up being more accurate. The difference in power usage is unlikely to be noticeable