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WS281x-based RGBW LED Strip
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This is for testing purposes a short sequence for 4 LEDs showing different colors and values

Logic analyzer setup
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The logic analyzer used was a Saleae Clone (at 4MHz)


Data
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Decoded it shows:
red (Led0: 0, Led1: 63, Led2: 127, Led3: 255)
green (0, 63, 127, 255)
blue (0, 63, 127, 255)
white (0, 63, 127, 255)