/* Sensor Gerak PIR HC-SR501 — deteksi gerakan */ const int pirPin = 2;    // output PIRconst int ledPin = 13;   // LED indikator int pirState = LOW; void setup() {  pinMode(pirPin, INPUT);  pinMode(ledPin, OUTPUT);  Serial.begin(9600);} void loop() {  pirState = digitalRead(pirPin);   if (pirState == HIGH) {   // ada gerakan    Serial.println("Gerakan terdeteksi!");    digitalWrite(ledPin, HIGH);  } else {    digitalWrite(ledPin, LOW);  }   delay(200);}