int pinLED = 13;
int pinSensor = A0;
int state = LOW;
int val = 0;

void setup() {
  // put your setup code here, to run once:
  pinMode(pinLED, OUTPUT); //deklarasi pin LED sbg Output
  pinMode(pinSensor, INPUT); //deklarasi pin Sensor sbg Input
  Serial.begin(9600);
  Serial.println("Pemantauan Gerakan Ruang Kelas");
}

void loop() {
  // put your main code here, to run repeatedly:
  val = digitalRead(pinSensor);
  if (val == HIGH) {
    digitalWrite(pinLED, HIGH);
    delay(200);


    if (state == LOW) {
      Serial.println("Ada Gerakan!!");
      state = HIGH;
    }
  }
  else {
    digitalWrite(pinLED, LOW);
    delay(200);
    if (state == HIGH) {
      Serial.println("Tidak Ada Gerakan!!");
      state == LOW;
    }
  }
}