Description

Ultrasonic Distance Sensor – HC-SR04

The Ultrasonic Distance Sensor HC-SR04 is one of the most widely used modules in robotics, electronics, and automation projects. Known for its accuracy, low cost, and ease of use, this sensor is the perfect tool for measuring distance and detecting objects without physical contact. Whether you’re a student, hobbyist, or engineer, the HC-SR04 provides reliable performance for all kinds of distance measurement and obstacle detection applications.

Key Features

• Operating Voltage: 5V DC

• Working Current: 15mA

• Measurement Range: 2 cm to 400 cm (up to 4 meters)

• Accuracy: ±3 mm

• Measuring Angle: ~15°

• Trigger Input Signal: 10µs TTL pulse

• Echo Output Signal: TTL level, proportional to distance

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

• Dimensions: Compact and lightweight for easy integration

How It Works

The HC-SR04 uses ultrasonic sound waves to measure distance:

1. The trigger pin sends a short ultrasonic burst (40 kHz).

2. This sound wave reflects back after hitting an object.

3. The echo pin measures the time it takes for the signal to return.

4. The sensor calculates the distance based on the speed of sound.

This method makes it highly accurate and reliable for detecting objects, even in challenging environments.

Benefits of the HC-SR04 Sensor

• Non-contact measurement: Detects objects without any physical interaction.

• High accuracy: Reliable distance readings with minimal error.

• Easy to use: Standard 4-pin interface works seamlessly with Arduino, Raspberry Pi, and other microcontrollers.

• Wide measuring range: From as close as 2 cm up to 400 cm.

• Affordable solution: Ideal for students, DIY makers, and professional projects.

• Versatile applications: Robotics, automation, obstacle avoidance, and more.

Applications

The Ultrasonic Distance Sensor HC-SR04 is versatile and widely used in:

• Robotics: Obstacle detection and avoidance in autonomous robots.

• Automation systems: Object detection for industrial and security projects.

• Smart parking systems: Detects vehicles for parking management solutions.

• Water level monitoring: Measures liquid levels in tanks without direct contact.

• DIY electronics projects: Perfect for students and hobbyists experimenting with Arduino or Raspberry Pi.

• Distance measurement tools: Create your own range finder or measurement device.

Technical Specifications

• Operating Voltage: 5V DC

• Operating Current: 15 mA

• Working Frequency: 40 kHz

• Maximum Range: 400 cm (4 m)

• Minimum Range: 2 cm

• Measuring Angle: 15°

• Resolution: Approx. 3 mm

• Interface Pins: VCC, Trig, Echo, GND

• Size: 45mm x 20mm x 15mm

Why Choose the HC-SR04 Ultrasonic Sensor?

When it comes to distance measurement and obstacle detection, the HC-SR04 Ultrasonic Distance Sensor stands out as one of the most accurate, reliable, and cost-effective solutions available today. Designed for makers, students, and professionals alike, this sensor has earned its reputation as a must-have module for countless projects in robotics, automation, and electronics.

One of the main reasons to choose the HC-SR04 is its ease of integration. With just four pins (VCC, Trig, Echo, GND), it connects seamlessly to Arduino, Raspberry Pi, ESP32, and other microcontrollers. This simplicity makes it the first choice for beginners learning about sensors and electronics, while its robust performance makes it equally appealing to advanced users and engineers.

The sensor offers an impressive measuring range from 2 cm up to 400 cm (4 meters) with ±3 mm accuracy, making it ideal for both short-range detection and longer-range measurements. Unlike infrared sensors, the HC-SR04 is less affected by light conditions, ensuring stable and consistent results in indoor and outdoor environments.

Durability is another key advantage. Built with quality components and a solid design, the HC-SR04 can handle continuous use in projects such as robotic obstacle avoidance, smart parking systems, water level monitoring, and home automation. Its low power consumption also makes it perfect for battery-powered devices.

Whether you are a university student building your first robotics project, a DIY hobbyist experimenting with smart systems, or a professional engineer developing advanced automation solutions, the HC-SR04 provides an unbeatable combination of performance, simplicity, and affordability.

With thousands of projects worldwide depending on it, the Ultrasonic Distance Sensor HC-SR04 has become a trusted standard in the maker community — a sensor that delivers consistent accuracy and reliable results every time.

Conclusion

The Ultrasonic Distance Sensor HC-SR04 is a must-have sensor module for anyone working with robotics, automation, or distance measurement projects. With its wide measuring range, high accuracy, low cost, and easy integration, it’s a perfect choice for students, hobbyists, and professionals alike. Whether you’re building a robot, smart device, or automation system, this sensor provides the precision and reliability you need.

👉 Add the HC-SR04 Ultrasonic Sensor to your toolkit today and bring your projects to life with smart, accurate distance sensing!

Data Sheet