Step 3Build It
The motor is being held by the legs of the big capacitor, and the two back legs of the robot are just the bent legs of the smaller capacitor. The tire is a rubbery offset thing from the same CD-walkman that I got the motor from. The offsets help reduce vibration in old portable music players.
This robot is pretty crappy, it was just a proof of concept. It has no sensors and ony one motor, but more power/motors/sensors can be added once you get a nice base working and you get the feel for everything.
This is a good resource for these types of robots:
http://www.solarbotics.net/library/circuits/se_t1_mse.html
Here is a good, cheap book on this type of robotics:
BEAM robotics book
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