Crowtail- Microwave sensor

  Non-contact detection
  Readings not affected by temperature, humidity, noise, air, dust or light - suitable for harsh environments
  Strong resistance to radio frequency interference
  Low output, urharmful to human
  Wide detection range and high velocity
  Supports non-living object detection

    Detection Distance: 2-16M continuously adjustable
    Emission Frequency: 10.525 GHz
    Precision Frequency Setting: 3MHz
    Output Power (minimum): 13dBm EIRP
    Harmonic Emission: < -10dBm
    Average Current (5%DC): 2mA typ.
    Pulse Width (Min.): 5uSec
    Load Cycle (Min.): 1%

    Sensitivity:(10dB S/N ratio) 3Hz to 80Hz
    Bandwidth: -86dBm
    3Hz to 80Hz Bandwidth Clutter: 10uV
    Antenna Gain: 8dBi
    Vertical 3dB Beam Width: 36 degrees
    Level 3dB Beam Width: 72 degrees

#include <MsTimer2.h>           //Timer interrupt function library
int pbIn = 0;                    // Define interrupt 0 that is digital pin 2
int ledOut = 12;                 // Define the indicator LED pin digital pin 13
int number=0;                    //Interrupt times
volatile int state = LOW;         // Defines the indicator LED state, the default is not bright

void setup()
{      
     Serial.begin(9600);          
     pinMode(ledOut, OUTPUT);// 
     attachInterrupt(pbIn, stateChange, FALLING); // Set the interrupt function, interrupt pin is digital pin D2, interrupt service function is stateChange (), when the D2 power change from high to low , the trigger interrupt.
     MsTimer2::set(1000, Handle); // Set the timer interrupt function, running once Handle() function per 1000ms 
     MsTimer2::start();//Start timer interrupt function

}

void loop()                     
{
Serial.println(number); // Printing the number of times of interruption, which is convenient for debugging.
    delay(1);        
    if(state == HIGH)  //When a moving object is detected, the ledout is automatically closed after the light 2S, the next trigger can be carried out, and No need to reset. Convenient debugging.
    {
        delay(2000);
        state = LOW;
        digitalWrite(ledOut, state);    //turn off led
    }

 }


void stateChange()  //Interrupt service function
{  
  number++;  //Interrupted once, the number +1

}

void Handle()   //Timer service function
{
    if(number>1)  //If in the set of the interrupt time the number more than 1 times, then means have detect moving objects,This value can be adjusted according to the actual situation, which is equivalent to adjust the threshold of detection speed of moving objects.
         {
                   state = HIGH;            
                   digitalWrite(ledOut, state);    //light led
                   number=0;   //Cleare the number, so that it does not affect the next trigger
         }
        else
              number=0;   //If in the setting of the interrupt time, the number of the interrupt is not reached the threshold value, it is not detected the moving objects, Cleare the number.
}