I’d found plenty of documentation on the iPod’s dock pinout and serial based remote interface, but never a respectable explanation of how to actually carry out it. finally I found BigCookie’s iPod to T&A remote control adapter tucked away in the iPod Linux wiki. He built the controller to receive remote signals from his T&A audio receiver and then translate them to control the iPod. He’s got schematics and code for a a PIC16F628 microcontroller. I’m guessing the code could be adapted to support nearly any input method the photo supports.
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