Videos here: http://greenarmyrobotics.org/news/time-lapse-videos-are-up
How-to Guide here: http://greenarmyrobotics.org/misc-guide-or-tutorial/time-lapse-cameras-how-to-guide
Our setup allowed us to mount inexpensive (for us, free) older digital cameras which would only take pictures at a regular interval while they detected movement/activity. This allowed us to work on the robots without worrying about starting/stopping the cameras; they were basically on autonomous and knew when the students were working or not.
Enjoy!