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this is my first robot, it isn't that complacated. two switches, a on off and on switch some wires bateries and thats all. the switch on top is the on off and on switch, the stick is the "sensor" there is a hole in the stick so when it hits a wall it hits the switch and reverses the diretion.
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/the-smack-into-walls-a-lot