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introduction
Introduction
The ultrasonic sensor is a device that measures distance by using sound waves beyond the human hearing range (greater than 20 kHz). It has two main components: a transmitter, which sends out a short burst of ultrasonic sound, and a receiver, which listens for the echo when that sound bounces back from an object. When the transmitter emits the pulse, it travels through the air until it hits an obstacle and reflects back toward the sensor. The receiver detects this returning echo, and the Arduino uses its internal clock to measure how much time passed between sending the pulse and receiving the echo. This time measurement is then stored in a variable and, using simple physics, converted into distance. Since the sound wave travels to the object and back, the measured time corresponds to twice the actual distance, so the final distance is calculated using the formula:
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Hanna Ben
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