Ultrasonic Sensor it is a general principle, seorak Dhaka (Radar), or zo na (Sonar) is the use of spectrum reflectivity at high (higher than human hearing) that the sender waves occur and affect and reflect it back to the object at the receiver. Waves (Ultrasonic wave) frequency up to 20kHz, but since not exceeding more than 50kHz too if this will make the sound waves in the air absorbed more and more. Use the selected frequency, which depends on the characteristics of the different tasks.
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