Using SmartMatrix library with HUB12 monochrome panels

1

Hi all!
I’m using ESP32 and P10 HUB12 panel. I want to use SmartMatrix library for my project.

I already connected everything to my ESP32 board and using multi row refreshing mapping example i got something shown.
I’m using only A and B pins so look’s like when example code goes to height above 2 nothing is shown.

So before going to deep by my own i would like to ask some help figuring how to use this library with this type of panels.

Thanks.

https://youtu.be/DXFlJaDSEjQ

2

I don’t think SmartMatrix supports AB panels, so you’d have to write your own mapping function

3

Can you share a picture of the back of your panel? Do you have a link to where you bought the panel?

4

20191129_214601
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5

Sorry but I don’t have a link because I just bought it in local store.

6

It’s a HUB12 (not HUB75) pinout. You can search Google Images for what a HUB12 pinout looks like.

I added limited support for HUB12 panels, with some brief info here:

Some more details are in the ESP32 branch README:

7

Great. Thanks a lot for your help. Works fine but there some ghost effect around numbers. How I can fix this?

15750532552687464073754318335868
15750532552687464073754318335868.jpg4032×1908 2.36 MB

8

I’m not exactly sure what’s going on here, but it looks like some kind of issue with clock timing or polarity.

I may have broken something on the ESP32 branch with this commit, can you reverse this commit locally and see if it works better?

9

Sorry for late response. After i revert commit suggested above whole screen just lit and nothing works. i revert it back and it still inverted.

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I slightly change example code. Just inverted colors.

void loop() {
  for(int j=0; j<kMatrixHeight; j++) {
    rgb24 colorByHeight;
    colorByHeight.red = 0;
    if(j & 0x01)
      colorByHeight.green = 0xff;
    if(j & 0x02)
      colorByHeight.blue = 0xff;
      
    for(int i=0; i<kMatrixWidth; i++) {
      backgroundLayer.drawPixel(i,j,colorByHeight);
      backgroundLayer.swapBuffers();   
      delay(250);  

      backgroundLayer.fillScreen({0xff,0xff,0xff});
    }
  }
}

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Then i decrease brightness to 5.

20200109_221517
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I’m not sure how signals should look like but seems like something is wrong hire.

Annotation%202020-01-09%20222432
Annotation 2020-01-09 222432.png1681×730 35.8 KB

14

That vertical ghosting effect that’s obvious in the picture 2nd from the bottom is unfortunately a common problem when refreshing HUB12 (And some HUB75 panels) quickly. I don’t have a solution for it.

15

Hi any news in slowing down the refresh for HUB12?