cartreader/hardware/README.md

Important: HW5 is still an untested work in progress and PCB files might contain errors.

The Open Source Cart Reader consists out of a main PCB that connects an Arduino Mega to different cartridge slot adapters.
To order a PCB you need to download the zipped gerber files and upload them to a PCB manufacturer. You don't have to change any of the settings but you can select a color you like.

You can view the schematic and the PCB files using a free and open source programm called KiCad 6.0.
To design your own adapters you can follow this tutorial

Also check out the user contributions for even more adapters: https://github.com/sanni/cartreader/discussions/354