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An ultrasonic sensor is an electronic device that measures the distance of a target object by emitting ultrasonic sound waves and converts the reflected waves into an electrical signal.  Ultrasonic waves travel faster than the speed of audible sound (i.e. the sound that humans can hear). The speed of the ultrasonic waves is approximately 343 meters/second. Ultrasonic sensors have two main components: the transmitter (which emits the sound using piezoelectric crystals) and the receiver (which encounters the sound after it has traveled to and from the target). Ultrasonic sensors are widely used in:  Ultrasonic sensors can be deployed for Distance measurement Proximity sensing Flow measurement Level measurement Distance measurement using ultrasonic sensor: In order to calculate the distance between the sensor and the object, the sensor measures the time it takes between the emission of the sound by the transmitter to its contact with the receiver.  The formula for this calculation is  D =