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A.    When something is within ____ of the ultrasonic sensor, then…

a.     20 cm: blink the LED on and off every other half second

b.     20-40 cm: LED should be on constantly

c.     40+ cm: the LED should be off

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A.    Make a motor spin as long as there is something in front of the IR sensor. Its direction depends on whether a person is within 20 cm of the ultrasonic sensor. If the object is removed from the IR sensor, the motor will stop. The behavior will repeat again something else is in front of the IR sensor.