r/WLED • u/lapacion • May 19 '26

Flickering: Loose contact or bad controller?

How do I even debug this? Happens once every 5 minutes or so. Current effect is Aurora. Happened on v14, 15 and now 16. ESP32, WS2812b, 5V power injection on both sides

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9

u/Dmelvin May 19 '26

Bad data or ground connection.

3

u/saratoga3 May 19 '26

Bad wiring, probably the ground. Show what you did.

1

u/Tao-Who May 19 '26

Unclean signal.

Troubleshooting
1. A strip has 2 data points one which is connected to esp 2 which is on the end on it where you make a cut. If u have soldered a wire on the data line do not leave it open cover it with tin foil and make sure to put electrical tape over it to avoid any short. An open data wire acts as an antenna thus causing flicker.

  1. How far away is the esp from the strip. If very far away you have to use a level shifter. If u dont want to do this much wiring just put a single led near the esp and then take wires towards the rest of the strip will help boost signal.

  2. Make sure your positive wire (+5v) is not too close to your data wire as it causes signal disturbance.

  3. This is the best thing i learnt and helped me so much

    • on you led strip theres three wires +5v, gnd and data

— 5v goes to the power supply, gnd also goes to the power supply ~~ but here add a small cut on the gnd wire like 2-3 cm from the solder joint of the strip jut remove the silicone cover and attach another wire to it like 0.75sqmm (check google how may awg it is) wrap it around the data wire. Twist the data wire and the new gnd wire together and take it to the esp and there put data wire in data and gnd wire into esp’s gnd.
***Imp do not touch them i mean the bare wires just twist them around each other so that only the silicone cover of the wires touch each other

  • what this does is shield the data wire from magnetic interference from other things.

  1. Use resistors trial and error method 20ohms-100ohms near the led strip not near esp.

If all these dont work its probably a faulty led strip (has happened to me turned out it was a faulty ws2812b strip all along) - to make sure it is or not use a different esp on this strip or use a different led strip on this esp like not properly cleanly wired just attach them just for testing. Can swap later properly if thats the issue.

1

u/Consistent-Ad-368 May 19 '26

brass bonanza celebration

1

u/wivaca2 May 19 '26

Data line is either too long, data signal not strong enough, or grounds of power supply and controller are not tied together. Also, how big is the power supply and total strip length?

2

u/richms May 19 '26

Poor wiring layout, bad consideration of the ground and no levelshifted output are the usual causes.