After getting an iPod Nano recently, I was thinking about ideas for add-on. Looks like an IR remote control can be easily designed along ATTiny11-6PC and a few discrete components.
iPod uses a protocol "Apple Accessory Protocol" to control iPod. The protocol is standard 19200 baud N81. The shortform protocol specification is here.
Another place to look at the protocol is ipodlinux.org
On the receiver side, AVR410 can be used to decode RC5 IR protocol. Any RC5 compatible remote control can be used.
Overall, the Tiny11 will receive commands from the RC5 IR remote and translate the command into the Apple Accessory Protocol commands (below)
|Play/Pause||0xFF 0x55 0x03 0x02 0x00 0x01 0xFA|
|Vol+||0xFF 0x55 0x03 0x02 0x00 0x02 0xF9|
|Vol-||0xFF 0x55 0x03 0x02 0x00 0x04 0xF7|
|Skip >>||0xFF 0x55 0x03 0x02 0x00 0x08 0xF3|
|<< Skip||0xFF 0x55 0x03 0x02 0x00 0x10 0xEB|
|End Button||0xFF 0x55 0x03 0x02 0x00 0x00 0xFB|
I have used AVR410 and AVR305 seperately in the past and have achieved good results. Tiny11 iPod remote firmware is just a matter of combining the two along with a lookup table.
If I get time (hopefully), I'll try to work on this idea :-)