* Connected the display directly to 5V and the Pi's composite video output! Conveniently, the PowerBoost module has an 'enable' pin that can simply be pulled low to cut all power. * Repurposed the iPod's original lock switch to control the device's power. I use quick haptic pulses in place of the iPod's original click sound, which triggers as your finger crosses each of the click wheel's virtual 'steps'.

* I used one of the Raspberry Pi's GPIO pins to drive a small DC motor (through a transistor, of course) for haptic feedback. Using an FPC breakout board, I easily connected the click wheel controller's 3.3V, GND, Data, and Clock lines directly to the Raspberry Pi.

Thanks to this 10-year-old Hackaday article (and accompanying blog post by Jason Garr, I was able to find the pinout. * The click wheel connected to the original iPod motherboard via an 8 pin FPC cable. Both the Raspberry Pi and the display run on 5V. It's charged through a 500 ma Adafruit USB charger, and boosted to 5V using the Adafruit PowerBoost Basic.

* Power is provided by a standard rechargeable li-ion battery.

Spotify car thing hack