Ultrasonic ranging module HC - SR04 provides 2cm - 400cm non contact measurement function, the ranging accuracy can reach to 3mm. The modules includes ultrasonic transmitters, receiver and control circuit. The basic principle of work:

(1) Using IO trigger for at least 10us high level signal,

(2) The Module automatically sends eight 40 kHz and detect whether there is a

pulse signal back.

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

Intro visual Source: http://bit.ly/2iJ1vAI


Links :

Java Application on Pi Playlist: http://bit.ly/2eB1O2K

Schematic : http://bit.ly/2ihvK5F

Pi4J GPIO Numbering : http://bit.ly/2ja20av

Download Pi4J Library : http://bit.ly/2j32blF

Code : http://bit.ly/2j95Osp

Buy Sensor : http://amzn.to/2iJ3Z24 (India)

Buy Raspberry Pi : http://amzn.to/2jlIOUH (India)


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