Which board do you have? It works on the Espruino board (although you have to change LED4 to LED3).
@Gordon started
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.
Which board do you have? It works on the Espruino board (although you have to change LED4 to LED3).