HC-SR04, The ultrasonic distance sensor Leave a comment

The HC – SR04 ULTRASONIC ranging module  provides 2cm – 400cm non-contact measurement function, the ranging accuracy is high (can reach to 3mm) and provide stable readings in an easy-to-use package. The modules includes ultrasonic transmitters,receiver and control circuit.

It emits an ultrasound at 40 000 Hz which travels through the air and if there is an object or obstacle on its path It will bounce back to the module. Considering the travel time and the speed of the sound you can calculate the distance.






  • Working Voltage: DC 5V.
  • Working Current: 15mA.
  • Working Frequency: 40Hz.
  • Max Range: 4m.
  • Min Range: 2cm.
  • Measuring Angle: 15 degree.
  • Trigger Input Signal: 10µs TTL pulse.
  • Echo Output Signal Input TTL lever signal and the range in proportion.
  • Dimension 45 * 20 * 15mm.


Principle of detecting object and measuring the distance between transmitter and the object using sound waves (like a bat) from aimagin.com


For more details about this product watch the following showcase video:


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