// Pin definitions
#define PIR_PIN 26
#define LDR_PIN 34
#define LIGHT_PIN 25
#define BUZZER_PIN 27

// Thresholds
const int lightThreshold = 3000;   // Dark condition
const unsigned long motionTimeout = 10000;

unsigned long lastMotionTime = 0;
bool lightOn = false;
bool buzzerOn = false;

void setup() {
  Serial.begin(115200);

  pinMode(PIR_PIN, INPUT);
  pinMode(LDR_PIN, INPUT);
  pinMode(LIGHT_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);

  digitalWrite(LIGHT_PIN, LOW);
  digitalWrite(BUZZER_PIN, LOW);

  Serial.println("Smart Automation System Started");
}

void loop() {

  int pirState = digitalRead(PIR_PIN);
  int ldrValue = analogRead(LDR_PIN);

  Serial.print("PIR: ");
  Serial.print(pirState);
  Serial.print(" | LDR: ");
  Serial.println(ldrValue);

  // Motion detected
  if (pirState == HIGH) {
    lastMotionTime = millis();

    // DARK condition (corrected logic)
    if (ldrValue > lightThreshold) {

      if (!lightOn) {
        digitalWrite(LIGHT_PIN, HIGH);
        lightOn = true;
        Serial.println("Light ON (Dark + Motion)");
      }

      if (!buzzerOn) {
        digitalWrite(BUZZER_PIN, HIGH);
        buzzerOn = true;
        Serial.println("Buzzer ON");
      }
    }
  }

  // Turn OFF after timeout
  if (millis() - lastMotionTime > motionTimeout) {

    if (lightOn) {
      digitalWrite(LIGHT_PIN, LOW);
      lightOn = false;
      Serial.println("Light OFF");
    }

    if (buzzerOn) {
      digitalWrite(BUZZER_PIN, LOW);
      buzzerOn = false;
      Serial.println("Buzzer OFF");
    }
  }

  delay(500);
}