This is the robot that I learned how to make at Metrix Create Space during the robotics class on September 30.

It uses an ATTiny microcontroller and Tower Pro microservos. We learned how to convert the servos from fixed to continuous operation, which I thought was worth the price of the class in itself. The wheels are laser-cut acrylic with automobile thermostat gaskets for the rims.

The yellow board is a custom PCB and there is a very small plastic/nylon ball caster in the back. Facing down in front, beneath the row of resistors, are infrared sensors for line-following.

All in all an interesting design and I learned a lot.