FastLED v2.1 Dithering This sketch is running with FastLED.setBrightness( 3 ) {out of a

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FastLED.show or FastLED.delay, yes.
The dithering is not automatically interrupt driven. Might be a fun hack to make it so, but that’s another whole can of worms…

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And this is why we should use “FastLED.delay()” instead of normal “delay()” because the former does “FastLED.show()” at a high framerate for us.

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Exactly. FastLED.delay() basically calls FastLED.show() in a fast loop until time is up, and the result is improved dithered visuals.