Ultrasonic sensor (HC-SR04)

The ultrasonic sensor (HC-SR04) is a reliable unit for contactless distance measurement, as it works by sending ultrasonic waves at 40 kilohertz and measuring the time taken for the echo to return. It features a measuring range from 2 cm to 400 cm with an accuracy of approximately 3 mm, making it suitable for applications that require precise and stable results. The sensor relies on simple trigger and echo pins, which makes it easy to connect with controllers like Arduino, ESP32, and Raspberry Pi. It is widely used in robots for obstacle avoidance, liquid level measurement in tanks, counters, automation projects, and smart navigation systems. Features: Measuring range: 2 cm – 400 cm Measuring accuracy: ~3 mm Operating voltage: 5V Easy to connect with controllers Applications: robots, automation, distance measurement, object detection, and smart systems