The HC-SR04 Ultrasonic Distance Sensor is a widely used and cost-effective module designed for non-contact distance measurement. Utilizing ultrasonic sound waves, this sensor can accurately detect objects at distances ranging from 2 cm to 400 cm (0.8 inches to 13 feet), with a resolution of approximately 3 mm. It’s an essential tool in a variety of applications such as robotics, automation, and object detection.
The sensor operates by sending out an ultrasonic pulse via the transmitter. When the pulse hits an object, it bounces back and is received by the onboard receiver. The time taken for the echo to return is used to calculate the distance to the object. The module includes built-in control circuitry to handle signal processing, helping eliminate spurious readings and providing stable data even in dynamic environments.
With just four pins (VCC, Trig, Echo, and GND), the HC-SR04 is easy to integrate with microcontrollers like Arduino, Raspberry Pi, ESP32, and more. Whether you’re building a robotic vehicle that needs obstacle avoidance or a smart parking sensor, the HC-SR04 is a dependable and simple-to-use solution.
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