We’ve seen some giant NES controllers in the past and even an Xbox 360 arcade controller. Now we have a coffee table style controller custom made for arcade games like Street Fighter 4. The first controler is basically a wireless Xbox 360 controller with larger buttons substituted for the standard ones.
The next controller is quite similar, but it’s built into a foldable table. The author has plenty of photos of similar arcade projects on his flickr page. Check this image for circuitry info on Xbox 360 controllers.
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