HC-SR04 Ultrasonic Sensor

HC-SR04 Ultrasonic Sensor

HC-SR04 Ultrasonic Sensor

 

HC – SR04 is a range module  provides non contact 2cm – 400cm  measurement function with  ranging accuracy can reach to 3mm. It includes ultrasonic transmitters, receiver and a control circuit. The basic principle of work:

  1.  Using IO trigger for at least 10us high level signal,
  2.  The Module automatically sends eight times 40 kHz signal 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

Electrical  Parameters

  • Working Voltage :   DC 5 V
  • Working Current :   15mA
  • Working Frequency : 40Hz
  • Max Range :  4m
  • Min Range : 2cm
  • Measuring Angle :  15 degree
  • Trigger Input Signal :  10uS TTL pulse
  • Echo Output Signal :  Input TTL lever signal and the range in proportion

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