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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.
@user79451
Love it, either that or a I2C voltage meter like this:
http://alexnld.com/product/cjmcu-219-ina219-i2c-bi-directional-current-power-monitor-sensor-module/