const int pir=5;
const int relay=6;

void setup()
{
  pinMode(pir,INPUT);
  pinMode(relay,OUTPUT);
  digitalWrite(relay,LOW);
  Serial.begin(9600);
}
void loop()
{
  int pir_s=digitalRead(pir);
  if(pir_s==HIGH);
  {
   Serial.println("Motion detected");
   digitalWrite(relay,HIGH);
   delay(5000);
  }
  else
  { 
    digitalWrite(relay,LOW);
    Serial.println(" No Motion detected");
  }
  delay(2000);
}