Understanding the Basics of Ultrasonic Sensors
https://www.allaboutcircuits.com/industry-articles/understanding-the-basics-of-ultrasonic-proximity-sensors/
WEBFeb 1, 2022 · Ultrasonic sensors operate under the same principle as a bat using echolocation —emitting a high-pitched noise and timing how long it takes to reflect off an object and return. These noises, or chirps, are typically between 23 kHz and 40 kHz, where the term ultrasonic comes from. How Ultrasonic Sensors Work. definition
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