Buse RGB LED Panel

What it is

A segment of a panel with 768 RGB LEDs on one side driven by chains shift registers on the other side.

The PCB is marked:

BTC004.1
24x32_10
RGB

Not sure which city is it operated in. Brno has green only panels and Bratislava got RGB but of different side.

Theory of operation

Pixmap split into segments, like on the panel

LEDs are organized into 24 x 32 pattern on one side, drivers are organized into a grid of 18 x 16 drivers. Three lines of LEDs snake around and are driven by a line of drivers on the other side.

Rows do have common CLK and LE signals. This means both halves of the row must be fed in parallel, but rows are entirely independent of each other.

Resources

Repository with sources to schematic and driver: https://codeberg.org/lubko/buse004-1

Partial schematic of the panel: https://codeberg.org/lubko/buse004-1/src/branch/main/buse-btc004.pdf

Schematic of the Arduino-based driver: https://codeberg.org/lubko/buse004-1/src/branch/main/arduino-adapter-buse-btc004.pdf

Pictures

Whole LED array
Arduino driver mounted on the back
In operation
LED side closeup with markings
Back closeup

TODO

Port to ESP*
Hook to Home Assistant
hailsatan