I have a custom Board with an WS2818B chip, but FastLED does not work with it. The Board the Signal comes from, is an ESP32-board (also custom) with an opto-isolation-circuit (6N137 optocoupler). I ...

Wait, there are already so many drivers for WS2811/WS2812 on crates.io? At the beginning I was not aware of that WS2811, WS2812, WS2812B, ..., WS2818 are basically the same. I just did not notice it.