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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 HC-SR04-Ultrasonic Range Finder can measure distances from 2 cm up to 400 cm with high accuracy, about 3 mm. 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 for projects where you need non-contact distance sensing.
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 price 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 pricing, genuine components, and technical support, Robocraze provides better value compared to many generic sellers online.
Read our blog explaining the ultrasonic sensor working.
| 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 then collected by the receiver of the module. Distance is directly proportional to the time these waves require to come back at the receiving end. The more the time taken, more the distance will be.
Choosing sensor is completely dependent upon 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 applications or dark indoor applications difficult. Ultrasonic sensors work using sound waves, detecting obstacles is not affected by as many factors. &qnbsp;If reliability is an important factor in your sensor selection, ultrasonic sensors are more reliable than IR sensors.
Ultrasonic sensors rely on the principles of echolocation to measure distances and detect objects. Using ultrasonic waves, they are able to generate a wave that is sent out from their transmitter which then bounces off an object or surface in its path before returning back as an echo. This information can then be used by the sensor's receiver unit for distance calculation analysis and detection by measuring the amount of time it took between sending out and receiving back the soundwave. Ultrasonic sensors offer reliable robust solutions suitable for use across many industries such as automotive production lines, robotics, agriculture, and medical diagnostics among others due to their compact design with built-in signal processing capabilities providing accuracy down to submillimetre-level precision.
Ultrasonic sensors are used for a variety of purposes, from detecting the presence and proximity of objects to measuring distances. They can be used in industrial applications such as warehousing and autonomous navigation systems, or they may be found on consumer devices like phone accessories that detect when an object is close by. Ultrasound waves sent out at frequencies above human hearing create sound echoes which bounce off solid objects like walls and barriers; this can then inform the user how far away something is located. This makes it ideal for robotics, automation processes, and medical imaging/diagnosis among other commercial uses.
The HC-SR04 is a well-known and highly sought after ultrasonic sensor frequently utilized in diverse electronic projects. Its operation involves transmitting high-frequency sound waves, which are then measured based on the time it takes for them to reflect off an object. This calculation enables accurate distance determination. A common inquiry surrounding this sensor concerns its classification as either analog or digital. In essence, its output signal is pulse width modulated (PWM), offering versatility as it can be interpreted differently depending on our preference - analogous or digital form conversion both being feasible options of utilization with ease and seamless integration capabilities into various applications.
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. We prioritize genuine components over low-cost replicas to ensure reliability in robotics, Arduino, Raspberry Pi, and automation projects.