Ultrasonic Sensor HC SR04 Module for Arduino

Description

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 A- Velocity of Sound (340M/S) / 2

Pin Configuration: Pin 1: Vcc (5V) Pin 2: Trigger Pin 3: Echo Pin 4: Gnd

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