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Ultrasonic sensors are also susceptible to interference from other ultrasonic sensors. The documentation for ultrasonic sensors will generally include a picture of the “beam pattern” that shows the shape of the “window” in which the ultrasonic will detect a target - pay close attention to this when selecting your sensor. Thus, it is extremely important to pick the right sensor for the job. As ultrasonics work by measuring the time between the pulse and its echo, they generally measure distance only to the closest target in their range. Ultrasonic sensors are generally quite easy to use, however there are a few caveats.
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