#include <Keypad.h>
#include <Servo.h>
#include <DHT.h>

#define DHTPIN 7
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// Keypad setup
const byte ROWS = 4;
const byte COLS = 4;
char keys[ROWS][COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
byte rowPins[ROWS] = {2, 3, 4, 5};
byte colPins[COLS] = {6, 8, 9, 10};
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
String password = "1234";
String inputPassword = "";

// Servo setup
Servo myServo;
int pos = 0;

// Sensor pins
const int pirPin = 12;
const int ldrPin = A0;
const int ledPin = 13;
const int fanLedPin = 8;   // fan - green pin
const int heaterLedPin = 9;   //heater - blue pin

// Thresholds
int lightThreshold = 500;
float tempThresholdHigh = 25.0; // Temperature to turn on fan
float tempThresholdLow = 20.0;  // Temperature to turn on heater

void setup() {
  Serial.begin(9600);
  myServo.attach(11);
  myServo.write(0);

  pinMode(pirPin, INPUT);
  pinMode(ldrPin, INPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(fanLedPin, OUTPUT);
  pinMode(heaterLedPin, OUTPUT);

  dht.begin();
}

void loop() {
  // Temperature-based fan/heater control
  float temperature = dht.readTemperature();
  Serial.print("Temperature: ");
  Serial.println(temperature);

  if (temperature > tempThresholdHigh) {
    digitalWrite(fanLedPin, HIGH);
    digitalWrite(heaterLedPin, LOW);
  } else if (temperature < tempThresholdLow) {
    digitalWrite(fanLedPin, LOW);
    digitalWrite(heaterLedPin, HIGH);

  } else {
    digitalWrite(fanLedPin, LOW);
    digitalWrite(heaterLedPin, LOW);
  }
  delay(3000);

  // Light control
  int lightLevel = analogRead(ldrPin);
  int motionDetected = digitalRead(pirPin);

  Serial.print("PIR: ");
  Serial.print(motionDetected);
  Serial.print(" | LDR: ");
  Serial.println(lightLevel);

  if ((lightLevel < lightThreshold) && motionDetected==HIGH) {
    digitalWrite(ledPin, HIGH);
  } else {
    digitalWrite(ledPin, LOW);
  } 
  delay(100);

  // Keypad door lock
  char key = keypad.getKey();
  if (key) {
    inputPassword += key;
    if (key == '#') {
      if (inputPassword == password) {
        myServo.write(90); // Open lock
        delay(5000);
        myServo.write(0); // Lock again after 5 seconds
      } else {
        Serial.println("Wrong Password");
      }
      inputPassword = "";
    } else if (key == '*') {
      inputPassword = ""; // Reset input
    }
  }

  delay(1000);
}