#define pir_pin 6
int pir_state = LOW;
int val = 0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  Serial.println("Pir Sensor");
  pinMode(pir_pin,INPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  val = digitalRead(pir_pin);
  if(val == HIGH)
  {
    if(pir_state == LOW)
    {
      Serial.println("Motion Detected!");
      pir_state = HIGH;
    }
  }
  else{
    if(pir_state == HIGH)
    {
      Serial.println("Motion Ended!");
      pir_state = LOW;
    }
  }
}