Arduino HC-SR04 Ranging Detector Mod Distance Sensor


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- The ranging accuracy can reach to 3mm.

- The modules includes ultrasonic transmitters, receiver and control circuit.

The basic principle of work:

- The Module automatically sends eight 40 kHz and detect whether there is a pulse signal back.

- IF the signal back, through high level , time of high output IO duration is the time from sending ultrasonic to returning.

Distance = ((Duration of high level)*(Sonic :340m/s))/2.


- Power supply :5V DC

- Quiescent current : <2mA

- Effectual angle: <15°

- Ranging distance : 2cm �500 cm

- Resolution : 0.3 cm

There are 4 pins out of the module : VCC , Trig, Echo, GND.

So it's a very easy interface for controller to use it ranging.

The all process is :

- Pull the Trig pin to high level for more than 10us impulse

- The module start ranging

- Finish ranging

- If you find an object in front

- Echo pin will be high level

- Based on the different distance,it will take the different duration of high level.

Distance = ((Duration of high level)*(Sonic :340m/s))/2