int pir =9;
int pirvalue ;
int led = 10;
void setup()
{
  Serial.begin(9600);
  pinMode(pir,INPUT);
  pinMode(led,OUTPUT);
}
void loop()
{
  pirvalue= digitalRead(pir);
  if(pirvalue==1)
  {
    digitalWrite(led, HIGH);
    Serial.println("object detected ");
  }
  else
  {
    digitalWrite(led , LOW);
    Serial.println("object not detected ");
  }
}