int calibrationTime = 30;
long unsigned int lowIn;
long unsigned int pause = 5000;
boolean lockLow = true;
boolean takeLowTime;
int pirPin = 3;
int ledPin = 13;
#include <Servo.h>

Servo myservo;  // create servo object to control a servo
                // a maximum of eight servo objects can be created

int pos = 0;    // variable to store the servo position

void setup()
{
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, HIGH);
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
  Serial.begin(9600);
  pinMode(pirPin, INPUT);
  digitalWrite(pirPin, LOW);
  Serial.println(“calibrating sensor “);
  for(int i = 0; i < calibrationTime; i++){
    Serial.print(“.”);
    delay(1000);
  }
  Serial.println(” done”);
  Serial.println(“Sensor Active”);
  delay(50);

}

void loop()
{
  if(digitalRead(pirPin) == HIGH){
    digitalWrite(ledPin, LOW);
  for(pos = 0; pos < 45; pos += 1000)  // goes from 0 degrees to 180 degrees
  {                                  // in steps of 1 degree
    myservo.write(pos);              // tell servo to go to position in variable ‘pos’
    delay(30);                       // waits 15ms for the servo to reach the position
  }
  for(pos = 45; pos>=1; pos-=1)     // goes from 180 degrees to 0 degrees
  {                              
    myservo.write(pos);              // tell servo to go to position in variable ‘pos’
    delay(30);                       // waits 15ms for the servo to reach the position
  }
  if(lockLow){
         //makes sure we wait for a transition to LOW before any further output is made:
         lockLow = false;          
         Serial.println(“—“);
         Serial.print(“motion detected at “);
         Serial.print(millis()/1000);
         Serial.println(” sec”);
         delay(50);
         takeLowTime = true;
       }

     if(digitalRead(pirPin) == LOW){      
       digitalWrite(ledPin, HIGH);  //the led visualizes the sensors output pin state

       if(takeLowTime){
        lowIn = millis();          //save the time of the transition from high to LOW
        takeLowTime = false;       //make sure this is only done at the start of a LOW phase
        }
       //if the sensor is low for more than the given pause,
       //we assume that no more motion is going to happen
       if(!lockLow && millis() – lowIn > pause){
           //makes sure this block of code is only executed again after
           //a new motion sequence has been detected
           lockLow = true;                      
           Serial.print(“motion ended at “);      //output
           Serial.print((millis() – pause)/1000);
           Serial.println(” sec”);
           delay(50);
           }
       }}}