DrawerBot
A drawing artbot that use vibration to draw.
Three motors with weights attached causes the supporting pens to
vibrate and doodle across the surface.

The controller uses a picaxe microcontroller to operate the motors.
DrawerBot won Silver during the Artbot Compentitions at Robogames 2007
Additional photos of DrawerBot's own work shown at my Botsmaker Gallery
at Deviant
Art
Click
here for Video of DrawBot in action!