Ultrasonic Sensor 4-Pin

Description :

This Ultrasonic Sensor can be interface with 5V logic microcontroller boards like Arduino, AVR, PIC, 8051 etc. Ultrasonic Sensor is very popular module for interfacing  with microcontroller for range detection of an object.

This  module  helps  you  how  to  deal  with  basic  electronics  component  in  your  project.  The Module automatically sends  40kHz frequency and detect whether there is a pulse signal back. IF the signal back, through high level , time of high output IO duration is the time from sending ultrasonic  to  returning.  Ultrasonic  sensors  transmit  ultrasonic  waves  from  its  sensor  head  and receives the ultrasonic waves reflected by the object in in the way. By measuring the length of time from the transmission to reception of the sonic wave, it detects the position of the object.

• First Connect 5v DC Power Supply to power up Ultrasonic Sensor module.
• Connect Trig and Echo to your pins of microcontroller.
• The  Timing  diagram  is  shown  below.  You  only  need  to  supply  a  short  10uS  pulse  to  the trigger  input  to  start  the  ranging,  and  then  the  module  will  send  out  an  8  cycle  burst  of ultrasound at 40 kHz and raise its echo. The Echo is a distance object that is pulse width and the range in proportion .
• You can calculate the range through the time interval between sending trigger signal and receiving  echo  signal.  Formula:  uS  /  58  =  centimeters  or  uS  /  148  =inch;  or:  the  range  = high level time * velocity (340M/S) / 2; we suggest to use over 60ms measurement cycle, in order to prevent trigger signal to the echo signal.

Technical Specification:

• 4 PINs Vcc, GND, ECHO, TRIG.
• Ultrasonic ranging module HC - SR04 provides 2cm-400cm
• Non-contact measurement function.
• Ranging  accuracy can reach to 3mm.
• Using IO trigger for at least 10us high level signal.
• The Module automatically sends eight 40kHz and detect whether there is a pulse signal back.

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