Monday, October 27, 2014

Ultrasonic Ranging Module HC - SR04

Ultrasonic Ranging Module HC - SR04

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×velocity of sound (340M/S) / 2,


Wire connecting direct as following:
  •  5V Supply 
  •  Trigger Pulse Input 
  •  Echo Pulse Output 
  •  0V Ground 
Electric Parameter 
  • Working Voltage DC 5 V 
  • Working Current 15mA 
  • Working Frequency 40Hz 
  • Max Range 4m 
  • 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