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HC-SR-04 Ultrasonic Sensor

HC-SR-04 Ultrasonic Sensor-Robocraze
HC-SR-04 Ultrasonic Sensor-Robocraze
HC-SR-04 Ultrasonic Sensor-Robocraze
HC-SR-04 Ultrasonic Sensor-Robocraze
  • HC-SR-04 Ultrasonic Sensor-Robocraze
  • HC-SR-04 Ultrasonic Sensor-Robocraze
  • HC-SR-04 Ultrasonic Sensor-Robocraze
  • HC-SR-04 Ultrasonic Sensor-Robocraze

HC-SR-04 Ultrasonic Sensor

Regular price
Rs. 72
Sale price
Rs. 72
Regular price
Rs. 84
You save Rs. 12
14% off
You save Rs. 12
Unit price
  • ⚡ Dispatched within 24 hours
  • 🚚 Free shipping on orders above Rs 500/-
  • 💰 Earn RC Coins on every purchase
  • 🛠️ Dedicated Technical Support Team
  • This Ultrasonic Sensor module is a transmitter, a receiver and a control circuit in one single pack.
  • It has very handy and compact construction.
  • It offers excellent range accuracy and stable readings.
  • HC-SR04 consists of ultrasonic transmitter, receiver, and control circuit. When trigged it sends out a series of 40KHz ultrasonic pulses and receives echo from an object.
  • Compatible with DIY Robot Car/Arduino, Node MCU, Raspberry Pi 4B, 3B+, 3B.
  • The modules include ultrasonic transmitters, receivers, and control circuits.
  • For bulk purchase you can check Ultrasonic Distance Sensor-Pack of 20

HC-SR-04 Ultrasonic Sensor

The HC-SR04 ultrasonic sensor is used to detect the distance of an object between 2-400cm with an accuracy of up to 3mm. It is based on the SONAR principle and hence its working is not affected by sunlight or other ambient lighting conditions making it ideal for outdoor applications also. The sensor works by transmitting a signal and starting a timer simultaneously, it then stops the timer when the receiver receives the signal after bouncing back from the object.

Note: The HC-SR04 has a 5V output (which needs to be reduced to 3.3V to work with the Raspberry Pi).

Check out our entire range of Distance/Proximity Sensors


  • Used to avoid and detect obstacles with robots like biped robots, obstacle avoider robots, path finding robots, etc.
  • Used to measure the distance within a wide range of 2cm to 400cm
  • Can be used to map the objects surrounding the sensor by rotating it
  • Depth of certain places like wells, pits, etc. can be measured since the waves can penetrate through the water

Package Includes:

  • 1 x HC-SR04 Ultrasonic sensor


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


1. How does ultrasonic sensor work?

  • 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.

2. Is ultrasonic sensor better or IR sensor for my project?

  • 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.