The robot moved like a tricycle. Its motion was triggered by the ultrasonic sensor--when the robot before it in line got close enough, it would begin to move. The following robot was triggered by a touch sensor, so we designed a ram for the front of the robot to maximize surface area, to ensure that the button was pushed with enough force.

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Ram at the left of the robot, ultrasonic sensor on the right

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Top view

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The ultrasonic sensor is at a height where it can recognize the short robot that triggered it