#include <MsTimer2.h> //Timer interrupt function
Int pbIn = 0; // Define the interrupt PIN is 0, that is, digital pins 2
Int ledOut = 13;
Int count=0;
Volatile int state = LOW; //Define ledOut, default is off
Void setup()
{
     Serial.begin(9600);
     pinMode(ledOut, OUTPUT);
     attachInterrupt(pbIn, stateChange, FALLING); // Sets the interrupt function, falling edge triggered interrupts.
     MsTimer2::set(1000,process); // Set the timer interrupt time 1000ms
     MsTimer2::start();//Timer interrupt start
}
Void loop()
{
    Serial.println(count); // Printing times of 1000ms suspension
    Delay(1);
    If(state == HIGH) //When moving objects are detected later, 2s shut down automatically after the ledout light is convenient.
  {
    Delay(2000);
    State = LOW;
    digitalWrite(ledOut, state); //Turn off led
  }
 
 }
Void stateChange() //Interrupt function
{
  Count++;
}
Void process() //Timer handler
{
  If(count>1) //1000ms interrupt number greater than 1 is considereddetected a moving object (this value can be adjusted according to the actual situation, equivalent to adjust the detection threshold of the speed of a moving object)
       {
                   State = HIGH;
                   digitalWrite(ledOut, state); //Lighting led
                   Count=0; //Count zero
  
       }
        Else
            Count=0; //In 1000ms, interrupts does not reach set threshold value is considered not detect moving objects, interrupt the count number is cleared to zero.
}