Our stab at a line follower robot

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.

The robot is laser cut from 4mm HDF board and consists of a flat chassis driven by two hacked servos. A top structure is added to carry batteries and various sensors.

A curved structure at the back acts as the 3'rd wheel.

Good traction is achieved by gluing sand paper to the wheels.

The sensor is made from layered HDF board.