Lets take a quick look at the Hardware of the IPod Receiver Unit shown on the left of the picture below.


Front and Back of the Receiver circuit board which basically contain a IR Receiver Chip and 8 Pin IC.











An up close look at the single IC on the circuit board


Which we find is an HS108N program once micro-controller which presumably has the task of converting standard RC5 IR control codes from a standard remote control IC into the IPod's uart protocol.

The receiver board is powered from +3.3 v  and we simply need to make 3 connections to the board , +3.3v , Gnd and RxD. A pin out of the IPod 3G/4G remote plug is given below:-

IPod 3G/4G Remote Pin out

Data Pin	Function
1	Rxd
2	Txd
3	Digital Gnd
4	+3,3v

Audio Pin	Function
1 (tip)	Left Channel
2 (1st Ring)	Right Cannel
3 (2nd Ring)	Audio Gnd
4 (Sleeve)	Video (if avail)

The IR transmitter unit contains a single "Blob covered" IC which i assume is a generic RC5 remote control transmitter chip.

Next Page The STM32 and IPod Remote Circuit Diagram