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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.
@migsanvi
@Gordon thanks for the clarification.
This project is for an installation embarked on trains and only the button will be visible, all the electronics will be hidden under a panel of difficult access. Therefore, replacing the battery can only be done once or twice a year.
My idea is to attach a battery that feeds the main power when the train is off.
Could you recommend some battery and intelligent power board that allows to use an external power (power supply) and when it is missing, switch to a battery?
Thanks!