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Elecfreaks HC-SR04 User Manual

Ultrasonic ranging module
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Ultrasonic Ranging Module HC - SR04

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Product features:

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,
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Wire connecting direct as following:
5V Supply
Trigger Pulse Input
Echo Pulse Output
0V Ground

Electric Parameter

Working Voltage
Working Current
Working Frequency
Max Range
Min Range
MeasuringAngle
Trigger Input Signal
Echo Output Signal
Dimension
Tech Support: services@elecfreaks.com
DC 5 V
15mA
40Hz
4m
2cm
15 degree
10uS TTL pulse
Input TTL lever signal and the range in
proportion
45*20*15mm

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Summary of Contents for Elecfreaks HC-SR04

  • Page 1: Product Features

    Tech Support: services@elecfreaks.com Ultrasonic Ranging Module HC - SR04     Product features: 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...
  • Page 2 Vcc Trig Echo GND Timing diagram 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.
  • Page 3  When tested objects, the range of area is n ot less than 0.5 square meters and the plane requests as smooth as possible, otherwise ,it will affect the results of measuring. www.Elecfreaks.com...

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