I have been buying parts from ArcadeWorld.com. They have coin-op slots, buttons, joysticks, the works.
I'm not working on coin-op at the moment, although I am now tempted, it would be a good addition to my project. I'm happy to share any of the things I do with the forum.
My to-do list is currently:
1. 4 Buttons for control. I am making a 4-player game where the only control is a button press. I have tested the Pi and AppGameKit with some mini PCB buttons, and it works perfectly. I have soldered the wires to the buttons ready to attach to the PCB.
2. LED button lights. The buttons have LEDs. I will trigger these from AppGameKit so that they respond to the action in the game. Again, I have tested AppGameKit and some LEDs on a bread board and it worked well. For the button LEDs I need to use Diodes. The Pi uses 3.3 Volt signals and low current, the LEDs run from a 12 Volt supply and need more current than the Pi can supply.
3. Pull handle. I want to start the game with a one-arm bandit style lever. I have a tilt switch to attach to the lever to simulate this.
So far, 9 input/outputs. So I have room for more functionality. I would also like to use an LED strip light for visual effects. This will need some more thought, because with a basic set up you can only have the RGB channels on or off. I could send a modulated signal, but it would also need smoothing to prevent flicker. More research needed!
Finally, as Spectre pointed out, you need one more thing. A very understanding family!
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Quidquid latine dictum sit, altum sonatur
TutCity is being rebuilt