The Logic controller is a custom developed pcb for a R7 Astromech unit which has 2×2 FLDs chains and 2 PSIs.
It can be used to wire traditional Teeces to it (minor code changes needed) and/or 3 digital light chains via DOUT 1,2 & 3. Out 1-3 are twice on the board.
Under the Nano is a mini buck converter to provide stable 5V if you want to power it between 7-12V.
Or simply use the 5V input terminal.
Available at shop.printed-droid.com
The Pinout is:
DOUT 1: D2
DOUT 2: D3
DOUT 3: D13