As mentioned in the first post, Getting Started, I decided to use a PCB that is made specially for the task at hand:
The aim of this part of the project is to use a GPIO to USB mapping software, the best of which I can find at the moment is Adafruit’s Retrogame. The idea is to wire up each port of the PCB to a GPIO pin on the Raspberry PI, Retrogame then will map this GPIO port to a pretend USB keyboard. The USB keyboard will be detected and used by RetroPie.
So first, wire up all of the connectors (sorry for potato cam).
I decided to use cables with a Duport connectors once more, so that I could easily plug and remove the cables when I’m not actively using them/testing.Â Colour coding the cables will probably be a big time saver as well, saves having to try and follow each cable back when mapping a control to a GPIO (left to GPIO20 for example).
The pin outs vary slightly depending on the model of of Pi that you have, I very much doubt you’d be reading this but be trying to use an old model Pi so I’ll upload a picture of the newer layout here:
If, by chance, you are using an older Pi simply search on Google for the pin out diagram.
Once you’re all plugged in to the free GPIO ports, follow the instructions linked to fromÂ Adafruit’s Retrogame‘s github page.Â I made a big mistake here and edited the wrong part of the config file, make sure if you’re not using an Adafruit PiTFT that you edit the correct section! I spent hours pulling hair out because I didn’t read it correctly.
Once set up correctly you should be able to hold a metal contact on each button to get a response in RetroPie.
Feel free to comment below if you have any questions or have any problems with this, I’ll do my best to help.