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Here is my entry for the 555 contest, a robot that can be set free on any ferrous metal structure. It has rare earth magnets for wheels (covered in hot glue for traction) attached to micro servos modified for continuous rotation. The bot closely resembles the Beetlebot by Jerome Demers, as it uses limit switches to change the direction of the bot. When the switch closes it shorts or opens the switch connections and causes the servo pulses to manipulate the direction of the servo. ...
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/freedom555bot