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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.
@JumJum
In the internet are some modules with WS2812 Leds. I created extensions to Espruino, written in C to support these modules.
LED-Matrix 8*8
LED-Circles
Sources are available on github