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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.
@GeekBot
Thank you Gordon. So I connected on BAT_IN as you suggest, it's clearly much safer and easier to manage with USB connection. The voltage drop is about 0.3 V. That's 10% of the battery voltage, but acceptable for my application. I guess this drop comes from the MOS transistor?
Best regards
GeekBot