int Pir = 20;
int statusPir = 0;
int ledYellow = 9;
int ledBlue = 4;

void setup() {
  Serial1.begin(115200);
  Serial1.println("Sistem pendeteksi gerak otomatis");
  pinMode(Pir, INPUT);
  pinMode(ledBlue, OUTPUT);
  pinMode(ledYellow, OUTPUT);
}

void loop() {
  statusPir = digitalRead(Pir);
  if (statusPir == HIGH) {
    digitalWrite(ledBlue, HIGH);
    digitalWrite(ledYellow, LOW);
    Serial1.println("Wah, ada gerakan!");
  } else {
    digitalWrite(ledBlue, LOW);
    digitalWrite(ledYellow, HIGH);
    Serial1.println("Ehm, tidak ada gerakan ...");
  }
  delay(3000); 
}