Dear fellows Let me ask you please about using the level shifter based on 74HCT08. It is related for the scenario when WS2812b is connected via a level shifter because a data pin of the LED required 5V meanwhile GPIO of RPi gives 3.3V only... https://hyperion-project.org/wiki/Supported-hardware WS281X-PWM: Used to directly connect WS2812b It works for me, perfectly. I just want to understand why we need to cascade two ports. For me it looks like one port is enough for the job. Any hint would be much appreciated.