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HC-SR04 Distance Measuring Transducer Sensor Ultrasonic Module

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Ultrasonic ranging module HC - SR04

The module is a 2cm - 400cm non-contact measurement device, with ranging accuracy of at best just 3mm.

The module includes ultrasonic transmitters, receiver and control circuitry.

The basic principle:
(1) Using IO trigger for at least 10us a high level input
(2) The Module automatically sends eight 40 kHz pulses, and detects whether there is a
pulse signal back.
(3) IF there is a return signal, time of high output IO duration is the time from sending ultrasonic to returning.
This is converted to distance = (high level time×velocity of sound (340M/S) / 2

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