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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.
@DrAzzy
As an aside - those are not WS2811's; The WS2811 is just a control IC, and the manufacturer of the light strip of whathaveyou would wire the IC up to an RGB LED. Those are WS2812's, with the control circuitry integrated into the same package as the LEDs.