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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
Does it matter about voltage drop across D1? As soon as the microcontroller is powered on it can turn Q1 on, which will remove the voltage drop anyway?
But I'd just use a schottky diode? About 0.3v voltage drop?