• Just give it a shot... Im reading different things about SK6812... 3 byte for RGB and 4 byte for RGBW. If it works, the SK6812 is just a 2812 clone. If it does not, you actually have 4 byte RGBW version. I do not know about configurability of built-in neopixel module... It would have to insert an extra byte for every pixel on the string for the W(hite) - 4th - LED. I doubt that a pixel built-in controller is configurable and does detect white pattern of different intensity within the 3-byte data that would control the W(hite) - forth LED - automatically. It is all up to the data feeder to make that decision and do the mix-in of respective switch to and from White.

    The module is built-in - and written natively - in order to meet the timing requirements for a smooth operation and also to leave some cycles to what you want to run in JavaScript.

    Under early WS2812 related forum entries you may find some that try to drive the LEDs purely in JavaScript. Modifying that code may give you some insight.

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