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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.
@the1laz
@Gordon I think running off a separate 5V simultaneously would be a niche case, so there's no need for mosfet or diode. If anyone wants to safely add a battery supply, they'd just need a diode for the battery voltage. I noticed this Adafruit board does it like that and it's a great minimal power supply setup:
https://learn.adafruit.com/system/assets/assets/000/029/703/original/adafruit_products_schem.png?1452721271
A bare bones espruino sounds great. Kind of like an arduino pro mini. I think espruino could really do with a cheaper model for once you've done all your prototyping and you just want to put it in something and leave it there.