I have a raspberry Pi 3+ with the Adafruit RGB Matrix Bonnet, and I'm encountering a really glitchy display on my matrix. I'm looking for troubleshooting tips to figure out if it's the bonnet, the matrix, or the cable.
I have a 32x64 RGB matrix purchased elsewhere, and I'm following these instructions: https://learn.adafruit.com/adafruit-rgb ... g-matrices. Under step 6, in the section on how to configure the LED-matrix library, I've opted for the "quality" route and soldered a jumper between GPIO4 and GPIO18 - but to be clear, I did that after encountering this glitchy display issue with the "convenience" setting. My raspberry pi is *not* overclocked.
Part: Adafruit RGB Matrix bonnet part No. 3211
Invoice No: 2712601
Ordered Nov 14, 2021
Buggy display with RGB Matrix Bonnet
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Talk about Adafruit Raspberry Pi® accessories! Please do not ask for Linux support, this is for Adafruit products only! For Raspberry Pi help please visit: http://www.raspberrypi.org/phpBB3/
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- adafruit_support_carter
- Posts: 29473
- Joined: Tue Nov 29, 2016 2:45 pm
Re: Buggy display with RGB Matrix Bonnet
Try also adding some --led-slowdown-gpio= (see same page you link)
But also, not all RGB matrices are the same. So it may be due to some difference in the matrix itself.For Raspberry Pi 3 use a slowdown of 1 to start (use higher values if image still flickers). For Raspberry Pi 4, use a slowdown of 4. Older Pi models might work with 0, try it.
- rafuzo
- Posts: 2
- Joined: Sun Dec 05, 2021 7:02 pm
Re: Buggy display with RGB Matrix Bonnet
Thanks - I've tried the led slowdown options and while some made it *slightly* better, it's still pretty unreadable using the examples in hzeller's repo. Mostly I'd just like to isolate what part is having the issue (bonnet -> cable -> matrix) so any suggestions are welcome. I've ordered backups of all three to see if I can isolate it that way, but would love troubleshooting/debugging tips that I can try on the components in hand.
Forum rules
Talk about Adafruit Raspberry Pi® accessories! Please do not ask for Linux support, this is for Adafruit products only! For Raspberry Pi help please visit: http://www.raspberrypi.org/phpBB3/
Talk about Adafruit Raspberry Pi® accessories! Please do not ask for Linux support, this is for Adafruit products only! For Raspberry Pi help please visit: http://www.raspberrypi.org/phpBB3/