The HC-SR04 Ultrasonic Distance Sensor is a reliable and cost-effective module for measuring distances using ultrasonic sound waves. It works by sending out an ultrasonic pulse and measuring the time it takes to bounce back from an object, then calculating the distance based on the speed of sound.
With a measuring range from 2 cm to 400 cm and a resolution of approximately 3 mm, this sensor is perfect for robotics, obstacle avoidance, level measurement, and proximity sensing. It features a simple 4-pin interface (VCC, Trig, Echo, GND) and works with any microcontroller, including Arduino, ESP32, ESP8266, and Raspberry Pi.
Whether you're building a robot that avoids walls or an automated water tank level system, the HC-SR04 offers accurate, consistent, and fast measurements.
Key Features:
✔️ Non-contact distance measurement from 2 cm to 400 cm
✔️ High accuracy with ~3 mm resolution
✔️ 4-pin interface: VCC, Trigger, Echo, GND
✔️ Operating voltage: 5V DC
✔️ Compatible with Arduino, Raspberry Pi, ESP8266, and ESP32
✔️ Compact and easy to mount
✔️ Ideal for robotics, object detection, automation, and level sensing
