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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
The pin reference is on my list of things to do once they're all shipped - but as @allObjects says you can use pretty much any pin for anything. On Puck.js it's even better as hardware peripherals can work on any pins at all (unlike with the STM32-based Espruinos).
Which lights were you thinking of using?
Right now, WS2811/2 lights won't work with Puck.js - but again that is something that should be fixed in a firmware update soon.
LED lights that accept data via SPI should work fine though, as the timing is less critical.