RGB P4 Panel 64*32 RPi RGB LED MATRIX

1

Hi,
I try to use 3 P4 Panel with a raspberry Pi 3B. I bought those panel in 2020 i think and never use.
I have installed RPI RGB LED MATRIx and compil it now its OK.

I have this trouble i think param not good somewhere !
Panel have FM6124S
I don’t use level shifter
Command : sudo ./runtext.py --led-rows=32 --led-cols=192 --led-multiplexing=4 -t Test
Press CTRL-C to stop sample

4000×3000 2.04 MB

Thanks for ur help

2

Hi,
Just add more info

crazy just remove --led-multiplexing and work well now :wink: but freeze a little bit
sudo ./runtext.py --led-rows=32 --led-cols=192 -t Test

Look love have refresh low now

Link to video

3

What are these strange dimensions of the panel?
Do you know that you have set a dimensions of the SINGLE panel here. Is your panel a 192 pixels wide?

4

Thanks for reply
Have P4 Panel 32*64
I put 192 because have 3 panels 64x3
im right ?

5

I don’t think so
See the “Connection” chapter in the README:

It seems that you have to use

--led-rows=32 --led-cols=64 --led-chain=3
1 Like
6

Thanks for ur reply
works well like this
sudo ./runtext.py --led-rows=32 --led-cols=64 --led-chain=3 -t Test

But i don’t why have this look like frequency too high or too low !

can see clear when i try with blocks

sudo ./grayscale-block.py --led-rows=32 --led-cols=64 --led-chain=3

Video with Grayscale
Video with Text can see normally i read only
yellow but have green also
Thanks

7

Hi,
Someone have idea why i get this result ?
Look the video with grayscale please

link http://kmeg.free.fr/VID_20250312_194116.mp4

Regards

8

Does it work with just one panel before you wire everything?
What have you tried?
What command line options are you using?
Have you tried the other ones in the README?
there is no info in your point, you can’t expect help like this

9

@marcmerlin
Thanks for ur reply
i get the same result with only one panel i just tried !
i use those command
sudo ./grayscale-block.py --led-rows=32 --led-cols=64 --led-chain=3
sudo ./runtext.py --led-rows=32 --led-cols=64 --led-chain=3 -t Test

I tried what you tell on the previous post i put 4.20 and i get something more better i think come from the voltage 3.3 from the Pi

i will try to put level shifter
when use level shifter i do all the pin except the ground so 16-3 = 13 pins of the panel ?

with 4.20v
link kmeg.free.fr/VID_20250315_232216.mp4
with 5v
link kmeg.free.fr/VID_20250312_194116.mp4

10

Thanks for ur help @marcmerlin
Works well i try all one day crazy ! i found why come from the wire of powersuplly ! now enought for the current ! I see this when i put a little bit more for voltage i put 5.20 and better after check the cable and found why !
regards

11

level shifter is indeed for all the signal lines. Have you looked into the electrodragon board in the README for hardware? It’s $3, so cheap that it’s not worth trying to do your own.