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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
Sorry - I'm an idiot. It should have been
pinMode(BTN,"input_pulldown")(the button pulls up to 3v when pressed).Firmware update info is here: http://www.espruino.com/Puck.js#firmware-updates