HC-SR04 Ultrasonic Sensor Module

The HC-SR04 is a distance measurement sensor that uses ultrasonic waves to detect objects from 2 cm to 400 cm with high accuracy. It operates by sending a trigger pulse and measuring the echo time to calculate distance. Working at 5V, it provides precise digital pulse output and is easy to interface with Arduino or ESP32. The module has stable performance, low power use, and is ideal for obstacle detection, robotics, and automation systems.