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