I don't have any documentation apart from the schematics of the PCBs. Building this kind of led projects is very easy these days. The SK6812 leds are great. You can interconnect hundreds of them and control them all with a single mc pin, and an easy to use library hides the programming complexity. Since I wanted to use a PCB anyway to properly solder the leds, I added some "intelligence" to the displays with an ATmega328p. All the displays are connected using the sda and scl pins and act as I2C slaves. The I2C addresses are defined by reading the voltage on a voltage divider using different resistors values. The ESP32 board is the master.
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