In the robotics lab they also had one of the UK's largest electronic floors. It's basically a metal floor with an electric current running through it so the robots would never need to be charged.
There is more however as I discovered in the BCL (Brain Control Lab) there was an EEG interface demo. An EEG basically picks up electrical signals from the surface of your brain and uses these signals to control movements. There were various examples of people playing games and people controlling robots to go left, right, forward and back all with using just their mind.
I have to say it was a great afternoon observing the demos, especially the group of five robots that could be co-ordinated.

Found this on Wikipedia, Oliver. As well as describing what a PID controller is/does it also goes into some basic control theory (relevant to controlled movement between two points: http://en.wikipedia.org/wiki/PID_controller
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