Looks nice! I guess it doesn't actually add much to the cost vs. a WS2812B if you're using LEDs on a PCB. I guess the LED strings with wires will still have a slight premium though.
What's the power-on state? I know I bought a bunch of APA104s (WS2812B clones) and the power on state was full blue, which really sucked for pretty much everything - the under counter lights in my kitchen have this annoying 100ms blue flash when turned on now!
By the way, you can change:
SPI.write doesn't try and receive any data, so it doesn't allocate an array for the data it gets back - it should also be a bit faster.
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