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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.
@allObjects
Nope, do NOT connect battery to 3.3V terminal... if the battery is really full - up to 4.2V - it puts too much stress on the mc, which has a limit of 3.6... neither STM nor ESP may survive... A good, low drop, low loss voltage regulator is the answer.