I have a 251 LED strip of WS2812B, 3 PIN. I have it powered with a 5v, 20a, 100w power supply. I have a RPI4 which is powered via its own USB-C supply. I have data from the LED connected to GPIO18 on the Pi. I have ground from the LED connected to GPIO30 on the pi.
When I measure voltage out of the PSU its 5.38v output.
If I read the power at the end of the LED strip when it is not lit, I read 3.5v.
I cannot get the LED working at all, just the first pixel lights up currently.
Do I need to install a level shifter? Or do I need to power the other end of the LED? If I do this, do I need more power? The full 5m strip is stated to be 90w, and I am 49 LED short of full.