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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.
@HughB
I had a look at the web page. Interesting stuff. I played around with it for a bit. Not quite sure why all the links are half page PDF files. Apart from quirkyness I am left wondering what motivated you to get this far with the project - must have been part of something else ?
It will be down to the accuracy of the componant chip. It is more than likely that each watch will drift around with varying degrees. Its not something I have ever noticed as I am not bothered about 1 second here or there. The great thing is that the RTC of the GPS is so much more accurate and a small amount of code was able to compensate. Its a great success story for an Open Source Smartwatch.