I have built a wooden 360° spherical panorama head prototype for smartphones and GoPro Hero cameras:
The rig is controlled by an Arduino UNO with an attached Bluetooth module or with an Arduino YUN (if using Wifi). The Arduino positions the stepper motor and servo in the correct position and then sends a capture trigger signal via Bluetooth or Wifi to the CameraPro app which runs on the smartphone. This process is repeated until all images are captured (e.g. ~52 images for a spherical panorama using the Nokia Lumia 1020 phone).
The full part list is available here: http://goo.gl/KObix5