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SainSmart HC-SR04 Ranging Detector Mod Distance Sensor (Blue)

  • 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
  • Power supply :5V DC, quiescent current : <2mA,effectualangle: <15 ranging distance : 2cm~400 cm resolution : 0.3 cm
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From the manufacturer

SainSmart HC-SR04 Ranging Detector Mod Distance Sensor (Blue)

More information please refer to sainsmart website.

SainSmart Ultrasonic Ranging Detector Mod HC-SR04 Distance Sensor (Blue)
Providing 2cm to 400cm of non-contact measurement

- Stable performance, accurate measurement range.

- Using IO trigger for at least 10us high level signal.

Features:

- The ranging accuracy can reach to 3mm.

- The modules includes ultrasonic transmitters, receiver and control circuit.

The basic principle of work:

- 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.

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

Specifiction:

- 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

- Based on the different distance,it will take the different duration of high level.

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. It's sure at least one 74 series chip on it. It is not a difficult task to crack it. So low price it is, even cheaper than your copy.

Product information

Product Dimensions 1.3 x 0.4 x 0.05 inches
Item Weight 0.8 ounces
ASIN B004U8TOE6
Item model number HC - SR04
Is Discontinued By Manufacturer No
Other display features Wireless
Color Blue
Manufacturer SainStore Inc.
Date First Available March 29, 2011

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SainSmart HC-SR04 Ranging Detector Mod Distance Sensor (Blue)

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Product Description

SainSmart 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