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Ultrasonic Sensor: An ultrasonic sensor measures distance by emitting ultrasonic waves from the sensor head, which are then reflected back toward the sensor to be detected. The sensor determines the distance by measuring the time it takes for an emitted ultrasonic wave to be returned to the sensor. The sensor has 4 legs which are labeled GND, TRIG, ECHO, and VCC. The VCC pin receives the power from the 5V pin. The TRIG pin is responsible for controlling the generation of ultrasonic waves. The ECHO pin is responsible detecting the ultrasonic waves being sent back.