![]() Therefore, in order to accurately calculate distance, we’ll need to consider the ambient temperature and humidity. The speed of sound in air changes with temperature and humidity. The speed variable is the speed at which sound travels through air. We actually divide this time in half since we only need to measure the distance to the object, not the distance to the object and back to the sensor. The time variable is the time it takes for the ultrasonic pulse to leave the sensor, bounce off the object, and return to the sensor. Rearranging this formula, we get the formula used to calculate distance: The formula relating the speed of sound, distance, and time traveled is: Knowing the time it takes the ultrasonic pulse to travel back and forth to the object, and also knowing the speed of sound, the Arduino can calculate the distance to the object. It then sends a signal to the Arduino with information about how long it took for the sonic pulse to travel. The ultrasonic range finder measures how long it takes the sound pulse to travel in its round trip journey from the sensor and back. When that pulse of sound hits an object, it’s reflected off the object and travels back to the ultrasonic range finder. Ultrasonic range finders measure distance by emitting a pulse of ultrasonic sound that travels through the air until it hits an object. ![]() It includes all of the parts, wiring diagrams, code, and step-by-step instructions for 58 different robotics and internet of things projects that are super fun to build! The Speed of Sound ![]() The 3-in-1 Smart Car and IOT Learning Kit from SunFounder has everything you need to learn how to master the Arduino.
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