All about HC-SR04 Ultrasonic Sensor Distance Measuring Modul

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Shehani
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All about HC-SR04 Ultrasonic Sensor Distance Measuring Modul

Post by Shehani » Tue Jan 07, 2014 3:12 pm

Sensor_ObjDec_Ultra_HC_SR04_7.jpg
Sensor_ObjDec_Ultra_HC_SR04_7.jpg (71.1 KiB) Viewed 2616 times

Description


Summary:

 

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:

•Using IO trigger for at least 10us high level signal,


•The Module automatically sends eight 40 kHz and detect whether there is a pulse signal back.


•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
Sensor_ObjDec_Ultra_HC_SR04_2.jpg
Sensor_ObjDec_Ultra_HC_SR04_2.jpg (72.84 KiB) Viewed 2616 times
Wire connecting direct as following:

1. 5V Supply
2. Trigger Pulse Input
3. Echo Pulse Output
4. GND

If you are sourcing a ultrasonic ranging module , the HC-SR04 is good choose . Its stable performance and high ranging accuracy make it a popular module in electronic market .

Compared to the Shape IR ranging module , HC-SR04 is more inexpensive than it . But it has the same ranging accuracy and longer ranging distance.

More details:

•power supply :5V DC


•quiescent current : <2mA


•effectual angle: <15°


•ranging distance : 2cm – 500 cm


•resolution : 0.3 cm


There are 4 pins out of the module : VCC , Trig, Echo, GND . So it’s a very easy interface for controller to use it ranging. The all process is : pull the Trig pin to high level for more than 10us impulse , the module start ranging ; finish ranging , If you find an object in front , Echo pin will be high level , and based on the different distance, it will take the different duration of high level. So we can calculated the distance easily :

Distance = ((Duration of high level)*(Sonic :340m/s))/2


Finally , look at the back of the module .All of the chip in the module have been burnish , maybe the author want to prevent the designed from plagiarism. But ultrasonic ranging module is nearly the same principle, so it’s not hard to speculated that the role of the chip — I’m sure at least one 74series chip on it ; ) . It is not a difficult task to crack it , but … it’s at so low a price , even cheaper than your copy .

The Package Include:
• The HC-SR04 Ultrasonic Module x 1
• 4pin Wire

Documents:
User Guide
HCSR04Ultrasonic_demo.zip
HCSR04Ultrasoni
(2.75 KiB) Downloaded 182 times
•HC-SR04 Demo For Arduino


Article courtesy of elecfreaks.com
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