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RGB Matrix problems...
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Please be positive and constructive with your questions and comments.

RGB Matrix problems...

by trobey on Sat Nov 20, 2021 5:16 pm

rgb3.jpg
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RGB2.jpg
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RGB.jpg
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I'm trying to use a 32x64 RGB matrix with the Adafruit Shield and testshapes_32x64 library on an (Elegoo) MEGA2560. I've tried a number of things including of course changing the #define for the CLK to use 11. This is the best I've come up with after a few hours of playing around. Can anyone give me some tips please?

trobey
 
Posts: 9
Joined: Sat Jun 19, 2021 8:47 pm

Re: RGB Matrix problems...

by adafruit_support_carter on Mon Nov 22, 2021 12:53 pm

For use on a MEGA, other wiring is needed. There's a note on this page:
https://learn.adafruit.com/32x16-32x32- ... rix-shield
The shield does not directly work with the Arduino Mega — additional jumper wires are needed to pins off the shield — see the “Jumper Wires” page for pinouts, or consider making your own Mega proto shield for that board.

adafruit_support_carter
 
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Re: RGB Matrix problems...

by trobey on Tue Nov 23, 2021 6:23 pm

Ahhh, thanks so much, I didn't realize that I needed special wires for the MEGA... So instead I just grabbed an UNO and the display came right up. But it seems to have a gap while running your 'scrolltext' example. Any idea what could be causing that?

rgb4.jpg
rgb4.jpg (129.82 KiB) Viewed 376 times

trobey
 
Posts: 9
Joined: Sat Jun 19, 2021 8:47 pm

Re: RGB Matrix problems...

by adafruit_support_carter on Tue Nov 23, 2021 6:27 pm

That's likely a memory issue. UNO's have a relatively small amount of memory, which limits maximum matrix size:
https://learn.adafruit.com/32x16-32x32- ... -3073477-4
Arduino Uno (or compatible ATmega328P boards) — limited to 32x16 matrix, no double-buffering (needed for flicker-free animation)

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Re: RGB Matrix problems...

by trobey on Sat Nov 27, 2021 10:09 pm

Ok thanks again...

I think I would like to try using an Arduino DUE. I read elsewhere that the DUE's 3.3V outputs can still drive the RGB matrix without level conversion. So...

Could you please provide the connections for using a DUE along with your SHIELD (or I suppose using the MEGA would be the same). I'm sorry, I tried to find clear info on the connection changes from your guide to support the MEGA but had no luck. Do you mean that your shield cannot be used at all with a MEGA or DUE (I could only find complete wiring diagrams and was looking for adaptions to still use your shield)

trobey
 
Posts: 9
Joined: Sat Jun 19, 2021 8:47 pm

Please be positive and constructive with your questions and comments.