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An attempt to use (expensive) LED Panels, those are not from ebay, and appears to be having weird mapping. They often used with a receivercard from NOVASTAR and scaler. Sold as a complete panel and ready to go.
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ADJ AV4IP stuff
Arduino
windows
ADJ_AV4IP_RAW
README.MD
Thim.jpg

README.MD

The LED Panel I'm using is a 52x52 panel, Normally it is a 64x64 panel, but really confusing. on each line of the screen, we have to send 8bits 8 times, to fill out 64 pixels. however, there are only 52 pixels active, 2 pixels are unconnected. I couldnt manage to edit the SmartMatrix(LC) library to do that so I do that in this sketch, since I only want to send video through WiFi/LAN. As for the ABCD lines goes the same, but I could manage to fix that by replacing lines in SmartMatrixMultiplexedCommon.h.

#define CONVERT_PANELTYPE_TO_MATRIXROWPAIROFFSET(x) ((x == SMARTMATRIX_HUB75_32ROW_MOD16SCAN ? 16 : 0) | \
#define CONVERT_PANELTYPE_TO_MATRIXSCANMOD(x)  ((x == SMARTMATRIX_HUB75_32ROW_MOD16SCAN ? 16 : 0) | \

to

#define CONVERT_PANELTYPE_TO_MATRIXROWPAIROFFSET(x) ((x == SMARTMATRIX_HUB75_32ROW_MOD16SCAN ? 13 : 0) | \
#define CONVERT_PANELTYPE_TO_MATRIXSCANMOD(x)  ((x == SMARTMATRIX_HUB75_32ROW_MOD16SCAN ? 13 : 0) | \

The LED Panel mapping looks like this.

abcd
v
 1 ...ooooooooooooo...ooooooooooooo...ooooooooooooo...ooooooooooooo  |-
 2 ...ooooooooooooo...ooooooooooooo...ooooooooooooo...ooooooooooooo  |-
 3 ...ooooooooooooo...ooooooooooooo...ooooooooooooo...ooooooooooooo  |-
 4 ...ooooooooooooo...ooooooooooooo...ooooooooooooo...ooooooooooooo  |---R1 G1 B1 pins 
 5 ...ooooooooooooo...ooooooooooooo...ooooooooooooo...ooooooooooooo  |-
 6 ...ooooooooooooo...ooooooooooooo...ooooooooooooo...ooooooooooooo  |-
 7 ...ooooooooooooo...ooooooooooooo...ooooooooooooo...ooooooooooooo  |-
 8 ...ooooooooooooo...ooooooooooooo...ooooooooooooo...ooooooooooooo  |-
 9 ...ooooooooooooo...ooooooooooooo...ooooooooooooo...ooooooooooooo  |-
10 ...ooooooooooooo...ooooooooooooo...ooooooooooooo...ooooooooooooo  |-
11 ...ooooooooooooo...ooooooooooooo...ooooooooooooo...ooooooooooooo  |-
12 ...ooooooooooooo...ooooooooooooo...ooooooooooooo...ooooooooooooo  |-
13 ...ooooooooooooo...ooooooooooooo...ooooooooooooo...ooooooooooooo  |-
14 ................................................................  |-
15 ................................................................  |-
16 ................................................................  |-
 1 ...ooooooooooooo...ooooooooooooo...ooooooooooooo...ooooooooooooo  |-
 2 ...ooooooooooooo...ooooooooooooo...ooooooooooooo...ooooooooooooo  |-
 3 ...ooooooooooooo...ooooooooooooo...ooooooooooooo...ooooooooooooo  |-
 4 ...ooooooooooooo...ooooooooooooo...ooooooooooooo...ooooooooooooo  |---R2 G2 B2 pins 
 5 ...ooooooooooooo...ooooooooooooo...ooooooooooooo...ooooooooooooo  |-
 6 ...ooooooooooooo...ooooooooooooo...ooooooooooooo...ooooooooooooo  |-
 7 ...ooooooooooooo...ooooooooooooo...ooooooooooooo...ooooooooooooo  |-
 8 ...ooooooooooooo...ooooooooooooo...ooooooooooooo...ooooooooooooo  |-
 9 ...ooooooooooooo...ooooooooooooo...ooooooooooooo...ooooooooooooo  |-
10 ...ooooooooooooo...ooooooooooooo...ooooooooooooo...ooooooooooooo  |-
11 ...ooooooooooooo...ooooooooooooo...ooooooooooooo...ooooooooooooo  |-
12 ...ooooooooooooo...ooooooooooooo...ooooooooooooo...ooooooooooooo  |-
13 ...ooooooooooooo...ooooooooooooo...ooooooooooooo...ooooooooooooo  |-
14 ................................................................  |-
15 ................................................................  |-
16 ................................................................  |-
vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
(same repeat for R3 G3 B3, R4 G4 B4)

dots are unconnected, "o" are LED's

As you noticed it has RGB.1 to RGB.4 pins, since SmartMatrix only outputs R1...B2 pins, I had to connect the left over pins to the outputs of the last shiftregister R1...B2, which means I had to find the last chip that output those and solder a thin wire to them. so I can control the screen which just R1...B2 pins. Done that and toggle SMARTMATRIX_OPTIONS_BOTTOM_TO_TOP_STACKING, now we got this working. My sketch does the skipping and the PC client that sends data to the ESP is just 52x52 3 times (aka RGB) as fast as possible(can go up to 60fps when using the "LedSend" on second monitor, does do 30fps on main screen :/). My code is quick and dirty if someone else could improve let me now it :).

I compiled the windows client on Visual Studio 2015, but might just work on the latest since I don't have special stuff in there. After compile, you can find the ESP32 IP # in the serial at boot, or look into your router's DHCP list. enter that in that small window and press connect, pressing POI will popup a capture window that capture that region on your windows.

Hardware

The hardware I use is ESP32. And the library from https://github.com/pixelmatix/SmartMatrix/tree/teensylc

Plans

  • I was thinking of adding normal LAN on SPI at the ESP32, (if it would together with SmartMatrix) WiFi can be unstable and may delay.
  • Making a OBS plugin to do all the scaling and such, I'm not sure if OBS would support such a thing. For now I just drag my capture program on a OBS window source.

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