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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.
@Ollie
Thanks @allObjects, yes the current is a concern, given that the ESP8266 needs a capacitor for reliable wifi that had crossed my mind also.
Re the pins set up, conceptually that sounds like exactly what I inferred/guessed/hoped might be possible, i imagine I would need to be switching pinMode in my code?