Ultrasonic Sensor by Bharathi Electronics

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