int ledPin = 13;
int inputPin = 2;
int pirstate = LOW;
int val = 0;

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

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