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What is the use of the Ultrasonic Sensor?

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What is the use of the Ultrasonic Sensor?

(a) Proximity Detection

(b) Humidity Detection

(c) Image Processing

(d) GPS

This question was addressed to me by my college director while I was bunking the class.

My doubt is from Ultrasonic Sensor topic in chapter Interfacing of Sensors, Actuators, and Other Modules of Arduino

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The correct choice is (a) Proximity Detection

Best explanation: The Ultrasonic Sensor is used for calculating the distance between the sensor and the object. It is mostly used for calculating the acceleration, velocity and position of the sensor attached to the device. It basically has two terminals which emit an Ultrasonic Signal and receive the emitted Ultrasonic Signal. The time difference between these two gives us the required data for such calculations.

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