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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.
@Gordon
Yes, that's fine if you're using a 5v-capable pin.
Have a look here. You can use any pin that doesn't have
3.3vwritten by it. As it happens, all of the USARTs are 5v capable so you're fine - but it's worth checking that page every time you connect a 5v signal.