ESP32 + SN74AHCT125N, Wiring? Max. length data cable to SK6812?

Issues
5

I will try to get a capacitor but I already tried to connect all OE to GND. Do you connect the capacitor just before the level shifter or doesn’t matter?

What’s the max. length of data cable in my case? How far have members here reached? Best cable to use? Think this could be a good youtube topic, how to maximize data cable with wled, esp32, 5V sk6812.

Think it’s very sensitive or I’m making something wrong. Is SK6812 worse to deal with compare to WS2812?

Resistor seems to be important, found this “and it will act as a termination resistor reducing “ringing” from signal edges”

My tests so far. Will continue this weekend.

  1. Cat. 5, only using one thread, length 0,24m between ESP32 and led strip SK6812
    No resistor Not working good
    22ohm Not working good, right color but flashing
    33ohm Working good
    47ohm Working good
    100ohm Working good
    470ohm Working good

  2. Cat. 5, only using one thread, length 0,24m between ESP32 and level shifter SN74AHCT125N, from level shifter to led strip 0,28m
    33ohm Not working good
    47ohm Not working good
    100ohm Not working good
    470ohm Working good

  3. Cat. 5, only using one thread, length 0,24m between ESP32 and level shifter SN74AHCT125N, from level shifter to led strip 4,5m
    100ohm Not working good
    470ohm Not working good, flashing a little

  4. Cat. 5, only using one thread, length 0,24m between ESP32 and level shifter SN74AHCT125N, from level shifter to led strip 2m
    100ohm Not working good
    470ohm Not working good, flashing a little

  5. Cat. 5, only using one thread, length 0,24m between ESP32 and level shifter SN74AHCT125N, from level shifter to led strip 2m, all OE at level shifter connected to GND.
    47ohm Not working good
    100ohm Not working good
    470ohm Working good

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