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2pcs Hc-sr04 Ultrasonic Distance Measuring Sensor Module Good Compatible Arduino UNO Mega R3 Mega2560 Duemilanove Nano Robot

  • 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
  • Static current: less than 2mA
  • he module performance is stable, measure distance accurately. SRF05, SRF02 ultrasonic ranging module and abroad comparable. Module precision, blind spots (2cm) super close, stable ranging success of this product according to market powerful! This module is completely Qian Yung GH-311 anti-theft module

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 View Details

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