iLounger “Morcheeba” recently posted news of his disassembly of the Apple iPod remote. His webpage includes photos, pinouts and a schematic. In his latest forum post, he explains why he took the remote apart. We’d also like to note that iLounger “norque83” has posted disassembly photos of the Apple iPod remote.
But the other answer is that I eventually want to build an interface to my car, so that I can control the iPod with the steering wheel track forward/back controls. Taking the remote apart helped find the electrical specs I need to emulate, and watching the signals on the scope told me how complicated the protocol was—hence how complicated of a microcontroller I’ll need for my project.