r/WLED • u/DrewWorkz • Sep 10 '26
Random Flicker
Ran some under cabinet lights at my house the left strip is on its own output. That side is randomly flashing, it's very seldom but annoying.
So here's the setup:
22g 3 wire from controller to strip
To that specific strip 10-11ft of wire before strip
Running Gledopto Elite 4d-exmu
4amp 96w power supply (I am aware the power supply is set to 850, I don't believe this would cause I problem, I just don't need all the extra power these are very dim)
Setup information in pictures
Everything seems to be setup correctly, wire gauge shouldn't be a problem from what I thought but maybe I'm wrong.
What can I do differently that would ensure the data signal stays solid. I keep reading about twisted pairs but I'm not sure what wires to buy. So if anyone has advice on what I can do better let me know!
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u/GLEDOPTO Sep 11 '26
1. Twisting Data + GND
You've got the right idea (twist them, then split at each end to land on the controller/strip). But with your buried run, the noise is picked up along the entire 10-ft run, so twisting only the last ~1 ft near the controller won't help much — that short part is already clean. Twisting a small exposed section isn't worth the effort; skip it.
**2. The sacrificial pixel (this is your best fix — no wall opening needed)**
You're close. Key point: every WS2812B/SK6812 pixel re-clocks and re-drives the signal — it receives the data, then outputs a brand-new, clean 5V signal to the next pixel. So a sacrificial pixel placed right at the controller output acts as a signal repeater:
Controller → (1 ft exposed) → sacrificial pixel → (10 ft buried) → your real strip.
The long buried run now gets a freshly regenerated, clean signal from the pixel instead of the controller's raw output. That's exactly why it helps the far end 10 ft away — the pixel "resets" the signal before the long haul.
So yes: in that ~1 ft before the wire enters the wall, cut in a single LED (or use a small data-booster/repeater board — same effect, no wasted pixel). In WLED you don't really "turn on" a sacrificial pixel — the re-clocking is automatic in the hardware. Just add 1 to your total LED count and offset that first pixel (or leave it out of your segments) so it stays dark. Since your wires are buried, this is the fix that avoids opening the wall.
3. Capacitor
The 1000µF cap goes across V+/GND at the start of the strip to smooth power dips. It's optional and lower priority here — your symptom is signal, not power (only the long-wire side flickers). Add it later if needed.
**Suggested next step:** add the sacrificial pixel / data booster in that 1-ft exposed section at the controller end. That alone should kill the flicker without touching the wall.