Ultrasonic Sensor HC SR 04

The HC-SR04 Ultrasonic Sensor is a reliable and cost-effective distance measuring module designed for embedded and electronics projects. It uses ultrasonic sound waves to accurately measure distances without physical contact, making it ideal for robotics, automation, and IoT applications.

With a simple trigger-and-echo interface, the HC-SR04 is easy to integrate with popular microcontrollers such as Arduino, Raspberry Pi, ESP8266, and ESP32.

Key Features

•  Distance Measurement Range: 2 cm to 400 cm

•  High Accuracy: Up to ±3 mm

•  Operating Frequency: 40 kHz ultrasonic waves

•  Low Power Consumption

•  Simple 4-Pin Interface: VCC, Trig, Echo, GND

•  Easy to Use & Integrate

•  Low-Cost & Durable Design

Technical Specifications

• Operating Voltage: 5V DC

• Operating Current: ~15 mA

• Measuring Angle: 15°

• Trigger Input Signal: 10 µs TTL pulse

• Echo Output Signal: TTL pulse proportional to distance

• Dimensions: Approx. 45 × 20 × 15 mm

Applications

•  Obstacle avoidance robots

•  Automatic parking systems

•  Distance measurement & object detection

•  Smart home automation

•  Industrial automation

•  Level sensing (water tanks, bins, etc.)

•  DIY electronics & academic projects

How It Works

1. The Trig pin sends a 10 µs pulse.

2. The sensor emits ultrasonic waves.

3. Waves reflect back from the object.

4. The Echo pin outputs a pulse width proportional to distance.

Distance is calculated using the time difference between sending and receiving the signal.

Package Includes

• 1 × HC-SR04 Ultrasonic Distance Sensor Module

Why Choose HC-SR04?

•  Proven and widely used
•  Accurate non-contact sensing
• Beginner-friendly
•  Excellent for learning & prototyping