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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
Just to add, if you manage to control WS2811s from PixelController, you could also try these guys: http://rgb-123.com/
They're a bit smaller than your pixel arrays but are at least ready-made square panels - so assembly would be a lot easier.