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HC-SR04 stands for High-Conductance Ultrasonic Sensor consists of a transmitter and receiver. It is used for measuring distance without physical contact and uses sound waves to determine the accuracy. The sensor has an effective range of two to four centimeters. Like other distance measuring devices, this sensor does not damage objects. The range of ultrasonic sensor is two to four centimeters.<br><br>The HC-SR04 produces high-frequency sound waves, which can measure distance or direction. The HC-SR04 is sensitive enough to detect objects within a cone of the radiation pattern.
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