More hardware hacking. I added some buttons for starting and stopping the robot, a joystick to be used for teaching specific routes (amongst other things) and an additional infrared motion sensor. The motion sensor will be used to detect the presence of people in a room when the robot is stationary, just like a burglar alarm. Once the robot knows that there is someone in the general vicinity it can use its cameras and pan/tilt mechanism to locate them.

http://farm4.static.flickr.com/3280/2427779514_d28b368557.jpg