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I played around with a moving platform using a tricycle wheel arrangement with the steering and driving motor on the same wheel.
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The chassis was made from a junked copier machine and wheels from a lawn mower and motors I found in junked equipment..
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The above design wasn't that great so I went to this design instead once I found some good motors that I could mount some wheels to and that had built in gear boxes.
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The motor control circuit which uses relays to switch direction.
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The robot used the Apple II computer which I made earlier.
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The computer interface board which drives the motors, speech synsizter, etc.
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The robot was design to carry a car battery for power.
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