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HC-SR04 Ultrasonic Distance Sensor Module
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The HC-SR04 Ultrasonic Sensor Module is a popular tool for measuring distance and detecting objects. It’s small, easy to use, and combines everything you need: a transmitter, receiver, and control circuit in one module. It works like a sonar, sending out sound waves to measure the distance to objects, just like how bats and dolphins sense their surroundings. This makes it an ideal ultrasonic sensor module for robotics and IoT applications where accuracy and reliability are essential.
This HC-SR04-Ultrasonic Range Finder can measure distances from 2 cm up to 400 cm with high accuracy, about 3 mm, making it the best distance measuring sensor 2cm to 400cm for both beginners and professionals. It’s reliable for many projects, from robotics to simple object detection, and works well even in different lighting conditions.
This HC SR04 ultrasonic distance sensor module has two main pins, Trigger and Echo, which connect easily to microcontrollers like Arduino, making it perfect as an ultrasonic distance sensor for Arduino projects where non-contact distance sensing is required. Understanding the HC-SR04 ultrasonic sensor working and pinout is simple, making it a go-to choice for students and developers.
Check out the best selection of Distance Sensors.
Note: The HC-SR04 sensor has a 5V output (which needs to be reduced to 3.3V to work with the Raspberry Pi).
Read our blog on how to connect ultrasonic sensor to Raspberry Pi.
At Robocraze, the HC-SR04 ultrasonic sensor price in India starts at ₹69, and may vary based on ongoing offers, stock availability, and bundled deals. We ensure high-quality, performance-tested modules that meet reliable accuracy standards for robotics, automation, and IoT applications.
Unlike low-grade alternatives in the market, our HC-SR04 sensors undergo quality checks to deliver stable distance measurements and consistent trigger/echo response. With competitive HC-SR04 ultrasonic sensor price in India, genuine components, and technical support, Robocraze provides better value compared to many generic sellers online.
Read our blog explaining the ultrasonic sensor working.
Understanding the HC-SR04 ultrasonic sensor working and pinout is essential for integrating it into your projects. The module operates using two main pins:
The sensor calculates distance based on the time taken for the sound waves to return. This simple mechanism makes it highly effective for automation, robotics, and obstacle detection systems. Its easy interface is one reason why it is widely used as an ultrasonic distance sensor for Arduino projects.
| Parameter | HC-SR04 Ultrasonic Sensor (Robocraze) | Typical Low-Grade Alternative |
|---|---|---|
| Operating Voltage | 5V DC | 5V DC |
| Operating Current | 15mA | 15–20mA |
| Measuring Range | 2cm – 400cm | 3cm – 300cm |
| Measuring Angle | < 15° | 15–20° |
| Accuracy | ±3mm | ±5mm or higher |
| Frequency | 40 kHz | 40 kHz |
| Build Quality | Quality-tested PCB with stable soldering | Inconsistent soldering quality |
| Performance Stability | Reliable echo response and stable readings | Possible signal noise and unstable readings |
| Power Supply | +5V DC |
| Working Current | 15mA |
| Output Signal | Electrical frequency signal |
| Ranging Distance | 2cms – 400 cms |
| Resolution | 0.3 cm |
| Measuring Angle | 30 degree |
| Dimensions | 3 x 2 x 1cms |
| Weight | 15 grams |
As we connect the ultrasonic sensor to 5V and initialize the input pin, it starts transmitting the sound waves which then travel through the air and hit the required object. These waves hit and bounce back from the object and are then collected by the receiver of the module. Distance is directly proportional to the time these waves require to return to the receiving end. The more the time taken, the greater the distance will be. This explains the HC-SR04 ultrasonic sensor working and pinout, which is widely used for accurate distance measurement.
Choosing a sensor is completely dependent on your application. There are a lot of limitations in infrared sensors, like the inability to use them in sunlight due to interference. It can make outdoor or dark indoor applications difficult. Ultrasonic sensors work using sound waves, and obstacle detection is not affected by as many environmental factors. If reliability is important, ultrasonic sensors are more dependable, especially in applications like ultrasonic sensor module for robotics and IoT projects.
Ultrasonic sensors rely on the principles of echolocation to measure distances and detect objects. They generate ultrasonic waves that bounce off objects and return as echoes. This data is used to calculate distance by measuring the time between transmission and reception. Understanding this principle helps in learning the HC-SR04 ultrasonic sensor working and pinout, which is essential for accurate implementation. These sensors are widely used across industries due to their precision and compact design.
Ultrasonic sensors are used for detecting object proximity and measuring distances in various applications. They are commonly used in industrial automation, robotics, and smart systems. These sensors are ideal as an ultrasonic distance sensor for Arduino projects, helping developers build obstacle detection systems, smart parking solutions, and automation setups.
The HC-SR04 is a well-known ultrasonic sensor used in various electronic projects. It operates by transmitting high-frequency sound waves and measuring the time taken for the echo to return. This enables accurate distance calculation, making it the best distance measuring sensor 2cm to 400cm for many DIY and professional applications. Its output is pulse width modulated (PWM), which can be interpreted as either analog or digital depending on usage.
Yes. The HC SR 04 Ultrasonic Sensor available at Robocraze is sourced from verified manufacturers and trusted suppliers to ensure originality and consistent performance. Each unit is quality-tested for accurate distance measurement (2cm–400cm range) and stable signal response. With a competitive HC-SR04 ultrasonic sensor price in India, we ensure reliable performance for robotics, Arduino, Raspberry Pi, and automation projects.