But if you really want a controller, go for a SNES usb controller. I am currently working on my Retro Pie and Still waiting for parts. To have fun, you pretty much need Snes USB, power supply , USB hub if you want, and A custom case( My parents have a big 3d printer, that I can use if I pay) Then you would have a PiePhone 5s XD ! Joking but SNES USB is really the way to go. My idea would probably have some lag in it.