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This robot uses two SPDT (single pull, double throw) switches, antennas, motors, and a battery pack. The antennas are connected to the switches, and so when the antennas hit a wall the relays then reverse the left motors direction until the switch is released (not touching the wall). Hope you enjoy!
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/the-beetlebot