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Piezo Speaker

Ultrasonic Ranging Module
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Ultrasonic Ranging Module

Price per Unit (piece): $3.30

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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.


Wiring Diagram (pinouts):

hc-sr04 pin diagram.jpg

Electric Parameter


Working Voltage

DC 5 V

Working Current


Working Frequency


Max Range

4m (13 ft)

Min Range

2cm (3/4 in)


15 degree

Trigger Input Signal

10uS TTL pulse

Echo Output Signal

Input TTL lever signal and the range in proportion


45*20*15mm (1 ¾ x ¾ x ½ in)



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. Formula: uS / 58 = centimeters or uS / 148 =inch; or: the range = high level time * velocity (340M/S) / 2; we suggest to use over 60ms measurement cycle, in order to prevent trigger signal to the echo signal.





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Last Updated: Saturday, 19 August 2017 15:07

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