![]() ![]() By the 50ms mark, the previously-sent sound waves have dissipated enough that they do not risk interfering with the next pulse or measurement. The pulse that gets sent out is 250 microseconds long, and it gets sent out on a regular schedule, every 50 milliseconds. One of the two “eyes” on the front of the sensor sends the signal out, and the other one receives the signal back (see the sensor’s info sheet PDF for the details). The ultrasonic sensor has the ability to measure objects between 3cm and 3m away (1.5 inches to ~10 feet). Using the amount of time it takes for the sound wave to bounce back, the sensor calculates the distance from itself to the object in front of it. It sends out a sound wave and catches the rebound. The ultrasonic sensor works like a bat’s or dolphin’s echolocation, or a submarine’s sonar. A special note about digital Ports 4 & 10. ![]() Moving on to the list of more advanced sensors, here we go on the Ultrasonic Range Finder. ![]()
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