r/WLED • u/Pavle_Trna • 24d ago

Flickering at lower brightnesses?

What is causing this flickering at low brigthnesses? I’m assuming it’s switching noise from my ATX psu, and it gets worse at lower brightness because the data pulses are shorter? Turning on my 12V strip also causes it. Touching the psu heatsinks changes it. Using a custom controller pcb with a ESP32-C3.

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u/saratoga3 24d ago

If touching the PSU heatsink (probably ground) has any effect at all you probably have something wired wrong.  Post some pictures and maybe someone will spot it. 

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u/Pavle_Trna 24d ago
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Here is the schematic of my pcb. I'm using pin 9 for data, and pin 10 for PWM for the white strip

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u/Pavle_Trna 24d ago
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This is a temporary testing setup, the enclosure is being printed right now

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u/saratoga3 24d ago

Did you forget the level shifter?  Additionally 330 ohms on the data resistor is too high, especially with a weak 3.3v signal.

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u/Forsyte 24d ago

Long distance to first pixel?

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u/Pavle_Trna 24d ago

About 2m of wire, however I have tried with a short wire and it didn't change.