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Pricelist: Retail Price (B2C) Pricelist
HC-SR04 Ultrasonic Distance Sensor – High-Precision Range Finder Module (2cm to 400cm) for Arduino, Raspberry Pi, and Robotics Obstacle Avoidance

HC-SR04 Ultrasonic Distance Sensor – High-Precision Range Finder Module (2cm to 400cm) for Arduino, Raspberry Pi, and Robotics Obstacle Avoidance

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ComponentSpecification
Operating Voltage5V DC
Operating Current15mA
Measuring Range2cm – 400cm
AccuracyUp to 3mm
Measuring Angle< 15°
Trigger Signal10µS TTL Pulse
Echo SignalTTL PWL Signal
Price
₹ 80.51 ₹ 80.51
(Tax included)

Barcode: 008855

Product Description The HC-SR04 Ultrasonic Distance Sensor is an essential module for non-contact distance measurement and obstacle avoidance projects. Utilizing sonar technology—similar to bats and dolphins—it transmits an ultrasonic burst at 40kHz and calculates the distance to an object by measuring the time taken for the echo to return. This high-precision range finder is fully compatible with 5V microcontrollers like Arduino and can be interfaced with 3.3V systems like Raspberry Pi using a simple level shifter. Its reliability and ease of use make it the industry standard for educational robotics and DIY automation.

Key Features

  • Stable Measuring Range: Provides reliable detection from as close as 2cm up to 4 meters with high consistency.

  • High Precision: Capable of achieving 3mm accuracy under optimal conditions, making it suitable for liquid level sensing and precision mapping.

  • Compact Design: The small PCB footprint and dual-transducer layout are ideal for mounting on small robot chassis and drones.

  • Easy Interfacing: Operates on just 4 pins (VCC, GND, Trigger, Echo), requiring minimal digital I/O pins from your controller.

  • Standard 5V Logic: Designed to work seamlessly with the most common hobbyist electronics and development boards.

Technical Details

  • Working Frequency: 40kHz ultrasonic pulse prevents interference from common environmental noise.

  • Input Trigger: Requires a 10-microsecond high-level pulse to initiate the measurement cycle.

  • Output Calculation: Distance = (High Level Time × Velocity of Sound (340M/S)) / 2.

  • Transducer Type: Independent Ultrasonic Transmitter and Receiver sensors for simultaneous signal processing.

  • Quiescent Current: Ultra-low standby current of less than 2mA ensures battery efficiency in portable projects.

  • Logic Level: 5V TTL logic output; high-level duration corresponds directly to the distance measured.

  • Signal Stability: Internal control circuitry filters out false echoes to ensure stable readings even in complex indoor environments.

  • Maximum Range Timing: If no obstacle is detected, the Echo pin stays high for approximately 38ms before resetting.

  • Temperature Compensation: While accurate, results can be further refined by factoring in ambient temperature for sound speed adjustments.

  • PCB Finish: High-quality green solder mask with clear pin labeling for error-free wiring.

  • Response Time: Fast measurement cycle allows for high-frequency polling, ideal for moving obstacle avoidance.

  • Directional Focus: Narrow beam angle of 15 degrees allows for targeted sensing without detecting side walls.

  • Mounting Holes: Includes pre-drilled holes for secure attachment to brackets or robot frames.

  • Robust Construction: Piezoelectric ceramic transducers are resistant to vibrations and common mechanical shocks.

  • Environmental Tolerance: Operates effectively in humidities up to 90% (non-condensing).

Prototyping and Engineering Tips from Robogears

  • 9V Battery Use: When powering your project with a 9V battery, ensure the HC-SR04 is connected to the Arduino's 5V regulated output. Connecting 9V directly to the VCC pin will destroy the sensor.

  • 18650 Cell: For stable readings in mobile robots, power the sensor through a 5V Boost Converter when using a single 18650 cell, as the sensor requires a steady 5V to maintain accuracy.

  • Resistor Tip (Raspberry Pi): Since the Echo pin outputs 5V, use a 1k and 2k resistor voltage divider to step the signal down to 3.3V before connecting it to a Raspberry Pi's GPIO pin.

  • Related Products: We recommend pairing this sensor with our HC-SR04 Mounting Brackets, SG90 Servo Motors (for scanning), and 2WD Robot Chassis Kits.

Package Includes

  • 1 x HC-SR04 Ultrasonic Distance Sensor Module.

Disclaimer Image is for illustration purpose only. Avoid touching the ultrasonic transducers during operation to prevent interference and maintain long-term calibration accuracy.