Ultrasonic Distance Sensor HC-SR04

Ultrasonic Distance Sensor HC-SR04 Australia
Ultrasonic Distance Sensor HC-SR04 Australia
Product ID: LB-LR0230


We can get 1000 units.
If you order today we can dispatch this stock between Wednesday, Nov 28 and Monday, Dec 03 2018.

Updated 3 days ago
Data Sheets & Documents
Updated 7 months ago
Updated 3 days ago
Little Bird's Description of the Ultrasonic Distance Sensor HC-SR04


If you need to add distance awareness to your robot or low altitude sensor for your drone this is one of the easiest and most commonly used ways.



  • Power supply: 5V DC
  • Quiescent current: <2mA
  • Effectual angle: <15°
  • Ranging distance: 2cm – 500 cm
  • Resolution: 1 cm
  • Ultrasonic Frequency: 40k Hz

Sequence chart


A short ultrasonic pulse is transmitted at the time 0, reflected by an object. The senor receives this signal and converts it to an electric signal. The next pulse can be transmitted when the echo is faded away. This time period is called cycle period. The recommend cycle period should be no less than 50ms. If a 10μs width trigger pulse is sent to the signal pin, the Ultrasonic module will output eight 40kHz ultrasonic signal and detect the echo back. The measured distance is proportional to the echo pulse width and can be calculated by the formula above. If no obstacle is detected, the output pin will give a 38ms high level signal.


Ultrasonic Distance Sensor HC-SR04 Guides
Ultrasonic Rangefinder

What to use when you need proximity sensing in an Arduino project? A good option is to use an ultrasonic sensor.

In this guide, you will learn to do just that with an Ultrasonic Rangefinder, a little module that can tell you when something is close, by measuring distance using ultrasonic waves. 

After completing this guide, you will be able to incorporate it into your projects!