Ultrasonic Sensor Module | Range Detection 4M | HC-SR04

The HC-SR04 Ultrasonic Sensor is a popular, low-cost module for distance measurement and obstacle detection. Using ultrasonic waves, it can measure objects from a few centimeters up to 4 meters with reliable accuracy.

It’s easy to use with Arduino, ESP8266/ESP32, Raspberry Pi, and other microcontrollers, making it a favorite for robotics, automation, and security projects.

Highlights

• Measuring Range: 2 cm to 400 cm

• Operating Voltage: 3.3 V – 5 V

• Accuracy: ±3 mm

• Interface: 4-pin (VCC, GND, Trig, Echo)

• Simple operation: Send a trigger pulse and read echo pulse width

• Widely supported by Arduino libraries and tutorials

💡 Ideal for: Obstacle avoidance robots, parking sensors, distance measurement tools, security systems.