Hello I recently got into this because of the show. I am planning on making a raspberry pi game emulator. However I`d also like to install an Arduino, Coin acceptor, and timer. I need help is the wiring of those 3 parts and the programming of the Raspberry pi to disable the usb ports until money is added.
Welcome to the element14 community! Have you already seen Ben Heck's episode on building a portable Raspberry Pi game console? Might be a good place to start. I know MAME used to be offered free for download right from the Raspberry Pi Store, but it appears they removed it sometime over the past few months.
Also, check out our Raspberry Pi Projects area and you might find similar builds which can help you as you develop your plan.