Building an arcade stick for PC Engine from scratch

So since I like my NEC PC Engine / Core Grafx, I decided I wanted an arcade stick for it. Sure I could buy one on eBay or whatever, but I wanted to check how to build one myself. Since I’m not a fan of pad hacking, where I would destroy an otherwise perfectly functioning pad (and I didn’t seem to find many cheap 3’rd party NEC pads) I looked around to find the schematics of the pad circuitry itself. Lo and behold, some italian guy has made the schematics!

So with this, I first made a crude veroboard version to see if the circuit worked (it did, here’s half a picture of it, somewhat later in the process)

The veroboard version

So I then put it into Kicad to make a *real* PCB. This became this:

The PCB version (Kicad render)
The real deal

Because of my limited handcrafting skills, I decided to 3D print the whole chassis in several smaller parts (due to the build volume of my printer).

Here the joystick part
The button part coming along
The completed unit with an orange bottom, colors baby!

So I decided to put three buttons on top, so the red is parallel with the yellow, both acting as SELECT. Green is RUN, black is Button II, white is Button I. The two small switches are turbo for I and II.

I’ll put the project on thingverse and Github. For now the controller board is on OSH Park here:

Next job is doing the 6 button controller!

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