LED Bonnet help on a RPI3A+
March 20, 2023, 03:57
Hi! I am NOT a tech person first of all and am doing this project with a friend of mine (<@224985825744650240>) as we scour for help~ Also a new Raspberry Pi user hi
But basically I have a adafruit Bonnet and been trying to get it working tonight for my 64x32 RGB matrix board, but it seems only half of it is working. Tried putting the bonnet on again and applied pressure, also tried code. Some forums are saying perhaps this is a bad bonnet (I’m really hoping not, kinda need this to work by Saturday for a cosplay competition)…
All help is appreciated and apologies for how niche this might be.
Thanks! Hopefully these tags are appropriate…
which IC is that board using? Or atleast link to that board
It’s on a ribbon and a power cable if that’s what your asking…?
(I'm also helping them virtually) https://www.adafruit.com/product/2277 is the led board and https://learn.adafruit.com/adafruit-rgb-matrix-bonnet-for-raspberry-pi/pinouts is the bonnet
This is what's happening, where green only shows up on half of the board
wdym half
<@224985825744650240>
The green shows up in the bottom half of the screen, but you can see in the image the line where the green is cut off
It's supposed to be a smooth gradient in the square
can you display full R, G, B, C, M, Y, W blocks?
If we set the board to full white, half ends up as magenta because it is missing green
Red and blue work fine
and post photos
<@327429470409457668>
I'm not the one with the board, so I'll do what I can
check wiring.
especially that flex cable, if it is not damaged, if there aren't any soldering mishaps (bad soldering), if that cable is conducting via all pins.
I’ll definitely check when I get home and update you!
Everything seems to check out?
As you describe it and from the conversation above it is most likely a faulty hardware and it is impossible to troubleshoot if it is the bonnet, ribbon cable or the P5 display.
But most likely it is the P5 display since you state that it is half the display that shows wrong colour. If it was the bonnet or the ribbon cable it would cause ALL green to be affected.
There's two pins on the bonnet for each color channel, each pin controlling half of the LED board, so couldn't it still be the bonnet if there's an issue with just one pin?
<@224985825744650240> that's not true, you can chain those displays
so that does not mean that one pin is for 1st half, other for another
I'm basing that off of this
That's from
oh ffs, it IS serial ...
with chip select
basically
so
yeah, it might be his pi as well.
So is my pi faulty…?
no way to know until you do some diagnostics.
Alright what do I do then to run these
already told you
Oh, yeah I already did that and I don’t see anything visibly broken
I tightened it up in some places however
and measured conductivity?
That I haven’t done
I have no idea how to measure
Do you have a multimeter?
And some wiring that fit into the ribbon cable?