Can this project be modified to make a non-wireless version so that I dont have to chop up a controller or buy an expensive iPod battery?
In theory, yes, although I havent done it myself. The easiest method would be to simply replace the RX/TX chip with a wire between where their data pins used to go. Youd also want to connect the controller and transmitter PIC to run off the 3.43V line and get rid of the 2 resistors in the receiver that form the voltage divider. That solution is about $10 more expensive than it needs to be though, as it still uses 2 PICs. You could do it with only 1 if you copied the relevant section of code from the transmitter firmware and placed it inside the receiver’s main loop, although it would take some effort to get going. That said, I am aware of at least one company that sells such adapters for much less that it would cost to make yourself: http://www.retrousb.com/wii.
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