Odroid ULTRASONIC Ranging Module for Odroid GO [77911]

Odroid ULTRASONIC Ranging Module for Odroid GO [77911]
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    Ultrasonic Ranging Module HC - SR04


    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.

    Test distance = (high level time×velocity of sound (340M/S) / 2




    example : https://wiki.odroid.com/odroid_go/arduino/31_ultrasonic_distance_meter