Minisumo robot
This is a mini-sumo robot which I created almost 7 years ago and till this day it's working just fine ;)
the robot is based on Atmel(Microchip currently) AVR ATmega124 microcontroller along with two optical sensors in front for opponent sensing, four reflective sensors for line sensing and accelerometer for collision detection.
Development of this included design of electronics/PCB in Eagle, manual assembly the outer shell was designed as 2D in Sketchup, cut out of a sheet of aluminum and bent manually.
I published more extensive description(In Polish) along with more photos as a post on "Forbot" forum:
Forbot post: Link