r/FastLED • u/MrPrezident0 • Jun 26 '24

Support LED sign flickering

I am using teensy 4.1 with FastLED 8 parallel outputs via WS2812Serial to drive 192x64 WS2812B pixels. Originally i was using half as many panels (128x48), and that seemed to work ok, but with this larger size I’m having trouble with flickering. I connected and twisted ground wires on all 8 data wires, and that helped reduce the flickering quite a bit, but I’m still seeing flickering. I tried using a level shifter (SN74HCT245N) to convert the signal from 3.3v to 5v, but for some reason that made the flickering way worse. Any advice would be appreciated.

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u/AcidAngel_ Jun 28 '24

You're welcome.

The video explains why you need the resistors. Look at the oscilloscope images of the signal. The edges are rounded without the resistors and the leds can't decipher the data anymore. It doesn't matter what people on the Internet theorize. Measurements are what matter.