If your camera has almost any form of remote-control device, it can usually be deconstructed and then connected to an Arduino for more complex or automated control. This has been demonstrated very well by Instructables user "Vicolaships" who explains how the remote control buttons can be wired to the Arduino via simple optocouplers. Then with some simple sketches you can control focus, shutter or other features offered on the remote. With the addition of a real-time clock you could also create exposure schedules to create time-lapse photography and other effects.
It's a simple project that can be applied to almost any camera, and help you take a greater variety of exposures - so visit the instructions to get started. And for more, we're on twitter and Google+, so follow us for news and product updates as well.