The HC-SR04 Ultrasonic Distance Sensor is a popular and reliable sensor for measuring distances using ultrasonic waves. It operates with a trigger and echo pin to calculate the distance between objects in the range of 2 cm to 400 cm with high accuracy. Widely used in robotics, obstacle detection, automation systems, and Arduino-based projects. Easy to interface with microcontrollers like Arduino, ESP8266, and Raspberry Pi.
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