Ultrasonic sensors emit a chirp usually between 23 kHz and 40 kHz, much higher than the typical audible range of human hearing at 20 kHz, hence the term ultrasonic. Using this chirp, they measure the amount of time it takes for the sound to bounce off an object. This is based on the same basic principles of echolocation used by bats to find their prey. As the speed of sound in air at room temperature is 343 meters per second, that time can be easily converted to distance, remembering that the ultrasonic chirp travels both to and from the object being sensed.


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