Sk6812 flickers every 15-60 sec

Kudos for the scope pattern, I was under the impression the level shifters were only required mainly for the Ardruino to drop the 5v signal down to 3.3v, have you tried direct wire with no resistor from the GPIO to the strip? as you mentioned they flickered when not using the level shifter.

Sidenote: Would love to know what current your LEDS are pulling if you have time

baudrate should be 150000 to 1750000, '
'
i think setting is too high, leds can not reset that fast > in default Hyperion.NG its 1000000 so you are quite high.

I f you are going to set bus speed too high then leds can not refresh in time anymore, it depends also on specifications of the leds but in a ballpark 1500000 should be fine.

mine version has possibillity to also set latchtime and refreshtime of the leds.

Zitat von Nugsc

But now I have a problem, when the LEDs change too fast all leds flicker. With still images and slow movements everything is fine.

thats why i think its your baudrate and not a grounding or cable issue, its only at fast changes of colours (data)

Ground at least 2 pins GND on your Raspi would be my strong advice.

how did you setup? 1 PSU or 2 PSU?
how much lights?

see for schematics this topic; https://hyperion-project.org/t…-on-the-rpi4.10701/page-2

Zitat von Nugsc

In the levelshifter i think it doesnt matter if i use LV1, 2, 3 or 4.
the LV and HV grounds are connected together

setup your PSU to 5 volts max ( with dial) a beep is not good maybe its running at max capacity or something? shortcut somewhere?
a Raspi likes more then one PIN to GND so if i was you i connect at least 2 GND pins from the Raspi to your PSU

don't connect LV and HV grounds together but follow my schematics on page 3
indeed it doesn't matter what input you use

132 leds use up maximum 6,5 Amps on 5 volts on full brightness.
So PSU should be strong enough to power Raspi/grabber/Leds/and levelshifter

remove the R470 from the setup, i have a feeling it causes a delay on dataline because you are using a levelshifter already you dont need that anymore. Also remove/dont use a capacitor and test again with schematics exact like the one of TP modding page 2 (1 PSU setup)

Zitat von Nugsc

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just see, if i touch the data cable and the tv frame the flicker stops o_O

so its a grounding problem >> follow my advice and use at least 2 GND pins from Raspi to LV gnd input.
then connect all other grounds from HV output gnd to GND ledstrip/PSU and your problems are over

remove the connection LV to HV GND wire :biggrin:

Zitat von jeroen warmerdam

baudrate should be 150000 to 1750000, '
'
i think setting is too high, leds can not reset that fast > in default Hyperion.NG its 1000000 so you are quite high.

I f you are going to set bus speed too high then leds can not refresh in time anymore, it depends also on specifications of the leds but in a ballpark 1500000 should be fine.

mine version has possibillity to also set latchtime and refreshtime of the leds.

You say the default is 1000000 but my default when I set mine up is 3000000?

I’m having the same issue with the flickering and can’t find a solution. Which is driving me mad.

What was the baudrate?

Zitat von Dominic

You say the default is 1000000 but my default when I set mine up is 3000000?

I’m having the same issue with the flickering and can’t find a solution. Which is driving me mad.

What was the baudrate?

the baudrate for SPI port is not a fixt setting, but i know in default in Hyperion.NG ( Béta ) its 100Mhz/1000000Hz
Make sure its not faster running then default clock speed of 400 MHz for Raspi3 , 250Mhz for Raspi1/2 ( Raspi 4 may go even higher)

So you can run it at 300Mhz, its your preference and what your ledstrip can handle/ how Hyperion in WebUI is set completely.
Between the 100/400 ( or higher even) you can "play" with the SPI port speed.

I have it set on my system on 175Mhz SPI0 >> ledstrip APA102 directly connected with GPIO's ( no electronics further needed)

note; flickering of leds is sometimes a PSU that can't handle the job or a grounding issue between devices.
goodluck.

why not run it directly from the pi without the levelshifter or resistor? even as a process of elimination.