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The two antennas server as collision detectors. The robot will turn every time it runs into an object.

The LEDs are used as indicators for the antennas. If the left antenna "feels something", the corresponding LED will turn off and vice versa.

Parts used:

• 2 * 3v-motors taken form those mini-ventilators
• 2 * 4xAA battery compartment
• 2 * pushbuttons
• 1 * on/off switch
• 2 * relais
• 2 * LEDs
• 1 * IDE-cable (used as circuit board)
• …wires, plastic, hot glue etc…

Brain (yeah, maaaaany cables)

Logic

Top: Normal driving mode.
Left: Left antenna feels something, the right motor switches driections.
Right: Same thing, but the ohter way around.