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Ultrasonic Module HC-SR04 Distance Sensor For Arduino | 
| Brand: SainSmart
Category: Toy
Buy New: $7.97
as of 5/19/2012 02:22 EDT details
New (6) from $7.97
Seller: 365buying
Sales Rank: 3441
Shipping Weight (lbs): 0
Dimensions (in): 6.2 x 5.3 x 0.4
EAN: 6952131720835
ASIN: B004U8TOE6
Availability: Usually ships in 1-2 business days
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| Features:
| • | 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, effectual angle: <15°?ranging distance : 2cm~500 cm?resolution : 0.3 cm |
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Product Description
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
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