HC-SR04 Ultrasonic Distance Measuring Sensor

The HC-SR04 Ultrasonic Sensor is a popular and reliable distance-measuring module designed for robotics, automation, and interactive electronics projects. Based on ultrasonic ranging technology, this sensor uses sound waves to detect objects and measure distances with impressive accuracy. It’s an excellent choice for hobbyists, educators, and professionals working on obstacle avoidance systems, parking sensors, liquid level detection, and countless other applications where non-contact distance measurement is required.

Key Features:

• Simple 4-Pin Interface: Easy connection with VCC, Trig, Echo, and GND pins for straightforward integration with microcontrollers.
• Wide Compatibility: Works seamlessly with Arduino, Raspberry Pi, ESP32, and other popular development platforms.
• Non-Contact Measurement: Provides accurate distance readings without physical contact with the target object.
• Dual Ultrasonic Transducers: Features separate transmitter (T) and receiver (R) elements for reliable operation.
• Compact Module Design: Small footprint (approximately 45mm × 20mm) with mounting holes for easy installation.
• On-Board Crystal Oscillator: 4.000MHz crystal (Y1) ensures precise timing for accurate measurements.
• Model: HC-SR04 ultrasonic distance sensor module.
• Operating Voltage: Typically 5V DC (VCC pin).
• Measuring Range: 2cm to 400cm (approximately 1 inch to 13 feet).
• Measuring Angle: Approximately 15-degree cone.
• Resolution: Up to 0.3cm accuracy.
• Trigger Input: 10μS TTL pulse to initiate measurement.
• Echo Output: Pulse width proportional to measured distance.
• Working Frequency: 40kHz ultrasonic frequency.
• Working Current: Typically 15mA during operation.
• PCB Colour: Blue with clear silkscreen labelling for easy identification.

Applications

• Robotics: Perfect for obstacle detection and avoidance systems in mobile robots and autonomous vehicles.
• Educational Projects: Ideal for teaching sensor interfacing, distance measurement principles, and embedded programming.
• Home Automation: Suitable for automatic lighting control, smart bins, and presence detection systems.
• Industrial Monitoring: Can be used for liquid level measurement, proximity sensing, and position monitoring.
• DIY Electronics: Great for creating parking sensors, security systems, and interactive art installations.

Why Choose the HC-SR04 Ultrasonic Sensor? The HC-SR04 Ultrasonic Sensor delivers reliable performance and exceptional value in a compact, easy-to-use package. Its proven design, widespread community support, and extensive documentation make it the go-to choice for distance measurement in countless projects. Whether you’re building your first robot or developing a sophisticated automation system, this sensor provides the accuracy and dependability you need to bring your ideas to life.