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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.
@Drarok
I've got a 3.3v power supply unit which I was using, but later also tried it just off the battery.
I've no idea what was causing the dimness – that's since gone away. Bad wiring or dodgy configuration is entirely likely!