The microcontroller is just an Arduino Leonardo, the custom board is just a daughter board for matrix grid with diodes. I can add a link to it on my website and describe how to build it if required, Since I cannot see a "Share design" on JLCPCB where I had it printed.

The microcontroller is just an Arduino Leonardo, the custom board is just a daughter board for matrix grid with diodes. I can add a link to it on my website and describe how to build it if required, Since I cannot see a "Share design" on JLCPCB where I had it printed.

Did you design it on the JLCPCB site? Usually there is a way to export it.

The point of pid.codes is to encourage open hardware so I'd like to see the daughter board open hardware.

Oh, I thought it was only about the board which got the PID. I have added the board schematic and PCB here:
https://bang.systems/project/pcb/matrix-grid
(also updated the README.md on the source)

Oh, I thought it was only about the board which got the PID. I have added the board schematic and PCB here: https://bang.systems/project/pcb/matrix-grid (also updated the README.md on the source)

If it is for a particular combination of boards then I want to push the creators to open source what they can. Please provide the exported file so it is modifiable and assign a license.