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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
@Robet, the Knightrider thing sounds like a good place to start...
Personally, I'd keep using Uint8Array - It uses less memory and it's faster, but otherwise it's just like a normal array.
And instead of a delay, you'll want to use
setIntervalto call your code maybe 5 times a second (200ms)...Let us know if you need any pointers... The only thing to note is depending on your LEDs (WS2811 or WS2812) red, green and blue are in different order - but if it's not right it's easy enough to experiment :)