The HC-SR04 Ultrasonic Sensor Module is a widely used distance measuring device ideal for robotics, automation, and object detection systems. It works by emitting ultrasonic waves and measuring the time it takes for the echo to return—calculating distance with high accuracy and stability.
Perfect for Arduino, Raspberry Pi, and ESP32 projects, it features a simple 4-pin interface (VCC, Trig, Echo, GND) and operates using 5V logic. This sensor is commonly used in obstacle-avoiding robots, parking assistance systems, smart bins, liquid level detectors, and STEM education kits.
