int LED = 13;                
int Input_PIR = 15;               
int Sensor_PIR = LOW;             
int val = 0;                    

void setup() 
{
  pinMode(LED, OUTPUT);      
  pinMode(Input_PIR, INPUT);     
  Serial.begin(9600);
}

void loop() 
{
  val = digitalRead(Input_PIR);  
  if (val == HIGH) 
  {            
    digitalWrite(LED, HIGH);  
    if (Sensor_PIR == LOW) 
    {
      Serial.println("Motion Detected!");
      Sensor_PIR = HIGH;
    }
  } else {
    digitalWrite(LED, LOW); 
    if (Sensor_PIR == HIGH) {
      Serial.println("No Movement!");
      Sensor_PIR = LOW;
    }
  }
}