The HC-SR04 is Ultrasonic Ranging Module made by ELECFreaks.
HC-SR04 pinout

Brief overview of the content in a HC-SR04 PDF file

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 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 Working Current Working Frequency Max Range Min Range MeasuringAngle Trigger Input Signal Echo Output Signal Dimension DC 5 V 15mA 40Hz 4m 2cm 15 degree 10uS TTL pulse Input TTL lever signal and the range in proportion 45 20 15mm Free Datasheet http www datasheet pdf com 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

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Manufacturers : ELECFreaks



Ultrasonic Ranging Module

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