The Adafruit CircuitPython NeoPixel library solves the real-time control problem by using the PWM and DMA hardware on the Raspberry Pi's processor. The PWM (pulse-width modulation) module can generate a signal with a specific duty cycle, for example to drive a servo or dim an LED.

WS2811 Signal line 256 Gray level 3 channal Constant current LED drive IC Sequence chart: 0 co d e 1 co d e R E T co d e I'm trying to get an WS2801 LED strip to work with my RPI3, but I can't even Launch the test script. I installed this 2 librarys via pip and later via Git clone as written in the corresponding readme files: adafruit-ws2801. Adafruit_GPIO. When i'm try to run this test script from This (German) site: