const int PIR_PIN = 2;
const int LDR_PIN = A0;
const int LED_PIN = 3;
const int BUZZER_PIN = 4;

// Variables
int lightLevel;
int pirState = LOW;
int prevPirState = LOW;

void setup() {
  pinMode(PIR_PIN, INPUT);
  pinMode(LDR_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  // Read PIR sensor
  pirState = digitalRead(PIR_PIN);
  if (pirState == HIGH && prevPirState == LOW) {
    Serial.println("Motion detected!");
    digitalWrite(LED_PIN, HIGH);
    tone(BUZZER_PIN, 1000);
    delay(1000);
    noTone(BUZZER_PIN);
    delay(500);
  } else {
    digitalWrite(LED_PIN, LOW);
  }
  prevPirState = pirState;

  // Read LDR sensor
  lightLevel = analogRead(LDR_PIN);
  Serial.print("Light level: ");
  Serial.println(lightLevel);
  if (lightLevel < 500) {
    digitalWrite(LED_PIN, HIGH);
    tone(BUZZER_PIN, 500);
  } else {
    digitalWrite(LED_PIN, LOW);
    noTone(BUZZER_PIN);
  }

  delay(100);
}