RGB LED Matrix - No clock

Projects Programming
1

Hello, I am trying to run the 64x32 RGB LED Matrix example (testShapes_32x64) on an Arduino Uno with LED Matrix Shield, and it does not appear to be clocking.

When I probe the ouputs with my scope, I see activity on the RGB pins and on ADDR D. There is no activity on CLK, OE, LAT, or ADDR A,B,C.

I see the same behavior with and without the Shield installed, so it does not appear to be a wiring issue with the Shield or LED Matrix.

I also tried the scrolltext_16x32 example and saw the same results, except that there is no activity on any of the ADDR lines, which makes sense because ADDR D is only used for larger panels.

This Uno has worked fine for other recent projects.

I am using version 1.8.12 of the Arduino tools, with version 1.1.3 of the RGB matrix Panel library.

Any ideas of what to try next?

Thanks,

David

2

Because the pins aren’t shaking, either the source data is incorrect, or you code is missing something.
Once you get past this it’s probably worth looking at your parts & wiring.

3

After spending awhile picking apart the RGBMatrix code, I discovered that the larger panels are not supported by Uno. A Mega is required.

4

That’s half an answer....
The two chips have the same processing core, with different FLASH, RAM and EEPROM capacities.
If it compiles and fits in a UNO, it should run.
The pins will still toggle etc, you have a more fundamental problem to solve.