int led = 2;                
int pir = 15;               
int pirState = LOW;             
int val = 0;                    

void setup() {
  pinMode(led, OUTPUT);      
  pinMode(pir, INPUT);     

  Serial.begin(9600);
}

void loop() {
  val = digitalRead(pir);  
  if (val == HIGH) {            
    digitalWrite(led, HIGH);  
    if (pirState == LOW) {
      Serial.println("Gerakan Terdeteksi!");
      pirState = HIGH;
    }
  } else {
    digitalWrite(led, LOW); 
    if (pirState == HIGH) {
      Serial.println("Tidak Ada Gerakan!");
      pirState = LOW;
    }
  }
}