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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.
@BootySnorkeler
I'm just using two seven-segments and 5 LEDs, I think a coin cell would provide about 5-7 days of continuous power(LEDs will be used about 5 times an hour each use being 1 second long).