#define PIR_PIN 2
#define RED_PIN 9
#define GREEN_PIN 10
#define BLUE_PIN 11

void setup() {
  pinMode(PIR_PIN, INPUT);
  pinMode(RED_PIN, OUTPUT);
  pinMode(GREEN_PIN, OUTPUT);
  pinMode(BLUE_PIN, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int pirState = digitalRead(PIR_PIN);
  Serial.println(pirState);

  if (pirState == HIGH) {
    // 偵測到移動：亮紅色
    analogWrite(RED_PIN, 255);
    analogWrite(GREEN_PIN, 0);
    analogWrite(BLUE_PIN, 0);
  } else {
    // 沒偵測到移動：關閉 LED
    analogWrite(RED_PIN, 0);
    analogWrite(GREEN_PIN, 0);
    analogWrite(BLUE_PIN, 0);
  }

  delay(200);
}