int LEDpin = 13;   // LED pin  
int PIRpin = 8;    // The pin of Arduino connected to the PIR output  
int PIRvalue = 0;  // It specifies the status of PIR sensor  
void setup() {  
 pinMode(LEDpin, OUTPUT);       
 pinMode(PIRpin, INPUT);  
  // the output from the sensor is considered as input for Arduino  
 Serial.begin(9600);  
}  
void loop()  
{  
 PIRvalue = digitalRead(PIRpin);   
 if (PIRvalue == HIGH)   
 {           
   digitalWrite(LEDpin, HIGH);    
   // turn ON LED if the motion is detected  
   Serial.println("hello, I found you...heyyy..");  
 }   
 else   
 {  
   digitalWrite(LEDpin, LOW);  
   // LED will turn OFF if we have no motion  
   Serial.println("I cannot find you");  
   delay(1000);  
 }  
}