#define IR_SENSOR_PIN 16   // IR sensor output pin
#define EXTERNAL_LED_PIN 15 // External LED pin

void setup() {
  pinMode(IR_SENSOR_PIN, INPUT);
  pinMode(EXTERNAL_LED_PIN, OUTPUT);
  pinMode(LED_BUILTIN, OUTPUT); // Onboard LED
}

void loop() {
  int motionDetected = digitalRead(IR_SENSOR_PIN);
  
  if (motionDetected == HIGH) {
    digitalWrite(EXTERNAL_LED_PIN, HIGH);
    digitalWrite(LED_BUILTIN, HIGH);
  } else {
    digitalWrite(EXTERNAL_LED_PIN, LOW);
    digitalWrite(LED_BUILTIN, LOW);
  }

  delay(100); // Small delay to stabilize reading
}