You will need the following libraries to successfully compile the attached code: iPodSerial https://github.com/finsprings/arduinaap GLCD http://code.google.com/p/glcd-arduino/downloads/list For how these are used I'll refer you to the documentation that comes with ...
My girlfriend, a music buff, asked me to come up with a better way for her to look at the track information of the current song playing on her iPod touch while she was using it in the car. Those of you that have or have had an iPod touch know that it's not the easiest thing to read while driving. To see the song information you have to double tap the home button and then still the text is extremely small. Also, controlling playback is distracting as the iPod touch has no tactile buttons so it requires the user to look at the screen to find the location of the soft buttons.
My solution was to construct a device that would interface with the iPod and take the song information and then display it on a screen somewhere in the easy view of the driver. After quite a bit of work and research I finally arrived at the product you see here. My iPod information screen displays the song title, artist, album, song time, and play/pause symbol. It provides skip back, skip forward, and play/pause playback control as well as charges the iPod.
Edit: A lot of people have mentioned that some sort of volume control would be good to add. As it turns out when the iPod is controlled through the method used in this instructable, volume control is disabled. I suspect this is because this mode is meant to be used with some other device controlling all playback functionality remotely and so volume would be controlled with the device. In this case, volume is controlled with the car stereo's volume control.
Step 1: The Research
The first step in making this device was to find out if it was even possible. I had never even really given interfacing with an iPod much thought before this and I had no idea if protocols publicly existed to do so.
I came across several more resources, and then stumbled upon my primary resource. I found David Findlay's blog, http://davidfindlay.org/weblog/files/2009_09_07_ipod_remote.php, and on it he talked about his development of an iPod remote and an Arduino library that handled all the iPod interfacing in a very simple way. This is the library I used in my project.
I also found this website useful outlining the Apple Accessory Protocol, https://nuxx.net/wiki/Apple_Accessory_Protocol. It's not really necessary to understand as David's library handles this behind the scenes, but I thought it was good to know and it may be useful for other applications.