Found this old post that I somehow forgot to publish:
I and a couple of people from Illutron are running three workshops about robotics. One of the projects we are presenting is a line follower robot. We have chosen this since making a robot capable of following a black line on a piece of paper presents a number of good hardware and software challenges for the worksop participants.
This is our first version the hardware.
hacked servos. A top structure is added to carry batteries and various sensors.