HC-SR04 Ultrasonic Sensor

The ultrasonic distance sensor is a non-contact ranging module widely used in robotics, automation, obstacle detection, and STEM learning. It measures distance by transmitting an ultrasonic pulse and timing the returning echo from a nearby object.

The sensor can be connected to Arduino, ESP32, and many other microcontrollers using simple trigger and echo signals. Common applications include obstacle-avoiding robots, parking-assistance prototypes, liquid-level experiments, object detection, and distance-measuring projects.

Because it can detect objects without physical contact, it is a practical and beginner-friendly sensor for many robotics and automation applications.

Features:
• Non-contact distance measurement
• Uses ultrasonic echo timing
• Trigger and echo interface
• Useful for obstacle avoidance and level sensing