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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
Just to add, bobricius is a really nice guy:
https://www.tindie.com/products/bobricius/coin-cell-battery-emulator-cr2016cr2032/
It might not be super cheap, but it's nice to support him :)