HC-SR04 Ultrasonic Distance Sensor Module

The HC-SR04 Ultrasonic Distance Sensor Module is a reliable and widely used electronic sensor designed to measure distances without physical contact. It operates by transmitting high-frequency ultrasonic sound waves and measuring the time taken for the reflected waves to return after bouncing off an object. Using this time-of-flight principle, the module accurately calculates the distance between the sensor and the target object.

The module consists of two ultrasonic transducers: one acts as a transmitter that emits ultrasonic pulses, while the other serves as a receiver that detects the reflected signals. The HC-SR04 is capable of measuring distances ranging from approximately 2 cm to 400 cm with good accuracy, making it suitable for a wide variety of applications.

Designed for easy integration with microcontrollers such as Arduino, Raspberry Pi, ESP32, STM32, and other embedded systems, the sensor features a simple four-pin interface consisting of VCC, Trig, Echo, and GND. Its straightforward operation and low cost have made it a popular choice among students, hobbyists, engineers, and product developers.

The HC-SR04 is commonly used in robotics for obstacle detection and avoidance, autonomous vehicles, parking assistance systems, smart home devices, industrial automation, liquid level monitoring, and distance measurement projects. Its compact size, lightweight construction, low power consumption, and dependable performance make it an ideal sensing solution for both educational and professional applications.

Key Features

Non-contact ultrasonic distance measurement

Measuring range: 2 cm to 400 cm

High accuracy and stable performance

Operating voltage: 5V DC

Four-pin interface (VCC, Trig, Echo, GND)

Easy integration with popular microcontrollers

Compact and lightweight design

Suitable for indoor robotics and automation projects

Cost-effective solution for distance sensing applications

Widely used in educational, DIY, and industrial projects