This video demonstrats the ultrasonic sensor controling the speed of the motors. If an object is within one foot, the motor stops. If the object is between 1 and 2 feet, the motor is at half power. Finally if the object is greater than 2 feet away the motors move at full power.
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Nice video demonstration of a unit test. It would be nice to have a yard stick (meter stick?) lying on the table so that you could demonstrate the relationship between the object distance and motor speed.
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