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SENSORS > Ultrasonic Sensor


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HC SR-04 - Product features:


Ultrasonic ranging module HC - SR04 provides 2cm - 40cm the ranging accuracy can reach to 3mm.
The modules includes ultrasonic transmitter, 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.


Easy to Interface conversion boads avilable now ( PWM TO UART , OBSTACLE) - based on PIC microcontroller

  • OBSTACLE INTEFACE BRD
  • UART & OBSTACLE O/P BRD


Interfacing Pins:
-> 5V Supply
-> Trigger Pulse Input
<- Echo Pulse Output
-> 0V Ground

Electric Parameters:

  • Working Voltage DC 5 V
  • Working Current 15mA
  • Working Frequency 40Hz
  • Max Range 40cm
  • Min Range 2cm
  • MeasuringAngle 15 degree
  • Trigger Input Signal 10uS TTL pulse
  • Echo Output Signal Input TTL lever signal and the range in proportion
  • Dimension 45*20*15mm





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