RGB LED Matrix Panel - 64x64

Components & Accessories LEDs
1

Using a Raspberry Pi 4b 4GB to run the RGB LED Matrix Panel - 64x64

I’m experiencing a flicker issue that I cannot resolve. Anyone got any ideas?

Video of issue - https://youtu.be/DMQzvLyIlOY

Using the https://github.com/hzeller/rpi-rgb-led-matrix library

I’ve played with different values for the --led-slowdown-gpio, --led-pwm-lsb-nanoseconds, --led-pwm-bits parameters and I’m seeing framerates as high as 350+Hz depending on the options but this flicker is always present. In many cases it is much worse depending on the parameter values chosen.

Already turned audio off:

dtparam=audio=off in /boot/config.txt

and removed unneeded packages:

sudo apt-get remove bluez bluez-firmware pi-bluetooth triggerhappy pigpio

Command used for video:

sudo ./clock -x 5 -y 20 --led-show-refresh --led-slowdown-gpio=2 --led-rows=64 --led-cols=64 -f …/fonts/7x13.bdf -d “%H:%M:%S”

So, thanks for even reading this far. Hoping someone has the magical formula for this or even some additional ideas. Thanks again.

2

It seems your issue might be similar to this GitHub issue: https://github.com/hzeller/rpi-rgb-led- … issues/710. There are memory bus issues and having anything else running can cause these issues. I would suggest reading the repository README.md and issues to work on a better solution.

3

Thanks Brandon. I’ll give the C++ demos a shot first to see if they run better than the Python demos and I’ll recheck to ensure nothing else is running in the background. I’m not using the Adafruit HAT or Bonnet so the PWM hack doesn’t apply. It would be disappointing if Python, with the Raspberry Pi 4b, is not sufficient at all to successfully run the 64x64 matrix panel.

4

Tried with a Raspberry Pi 4b 8GB, to run the RGB LED Matrix Panel - 64x64, and ensured I was using the C++ demo and got the same result. Still looking for a solution. Would love to read about the setup for anyone that has gotten this to work without using an additional HAT or Bonnet. I’ll post here if I figure out the issue.

5

RGB LED Matrix Panel 64x64 - Flicker issue resolved

https://www.youtube.com/watch?v=TtgVlvoimC4

Using a Raspberry Pi 4b 8GB to run the RGB LED Matrix Panel - 64x64

https://www.sparkfun.com/products/14824

Flicker issue has been resolved by using the Adafruit RGB Matrix + Real Time Clock HAT with my Pi.

https://www.adafruit.com/product/2345

Instructions here

https://learn.adafruit.com/adafruit-rgb … i/overview

Command used for video:

sudo ./clock --led-rows=64 --led-cols=64 --led-show-refresh --led-slowdown-gpio=4 --led-brightness=50 --led-pwm-bits=8 -x 4 -y 25 -f …/fonts/7x13.bdf -d “%H:%M:%S”