Ultrasonic Distance Sensor HC-SR04

Ultrasonic distance sensor HC-SR04 is one of the most famous sensors used for measuring distance accurately and contactless. It works by sending a high-frequency sound pulse and measuring the time it takes to return after hitting an object. It is widely used in robots for obstacle avoidance, liquid level measurement systems, and security applications. It can measure distances from 2 cm to 400 cm with good accuracy. Technical details: Sensor model: HC-SR04 Operating voltage: 5 volts Measurement range: 2 cm to 400 cm Measurement angle: 15 degrees Interface: 4 pins (VCC, Trig, Echo, GND)