const int outPin = 21;
const int ledPin = 5;

void setup()
{
  Serial.begin(9600);
  pinMode(outPin, INPUT);
  pinMode(ledPin, OUTPUT);
  delay(1000);
}

void loop()
{

  int pirState = digitalRead(outPin);

  if(pirState == HIGH)
  {
    digitalWrite(ledPin, HIGH);
    Serial.println("Motion Detected in the Sensor");

    delay(2000);
  }
  else
  {
    digitalWrite(ledPin, LOW);
    Serial.println("Motion not detected.");
    delay(2000);
  }
}