#include <Wire.h>
#include <DHT.h>
#include <LiquidCrystal_I2C.h>
#include <Servo.h>

#define DHTPIN 2
#define DHTTYPE DHT22
#define LDR_PIN A0
#define SERVO_PIN 9
#define PIR_PIN 3
#define BUZZER_PIN 8

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);
Servo myServo;

void setup() {
  Serial.begin(9600);
  pinMode(PIR_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(11, OUTPUT);

  myServo.attach(SERVO_PIN);
  lcd.init();
  lcd.backlight();
  dht.begin();

  displayWelcomeMessage();
}

// Main loop to call each component’s function
void loop() {
  handleMotionSensor();
  int lux = readLDR();
  float temperature = readTemperature();
  float humidity = readHumidity();

  displayTempHumidity(temperature, humidity);
  controlLEDs(temperature);
  controlServo(lux);
}

// Method to display a welcome message
void displayWelcomeMessage() {
  lcd.setCursor(0, 0);
  lcd.print("BSIT-3A");
  lcd.setCursor(0, 1);
  lcd.print("Midterm in IOT");
  delay(2000);
  lcd.clear();
}

// Method to read and map the LDR value to lux
int readLDR() {
  int ldrValue = analogRead(LDR_PIN);
  int lux = map(ldrValue, 0, 1023, 0, 1000);
  Serial.print("LDR Value: ");
  Serial.print(ldrValue);
  Serial.print(" -> Lux: ");
  Serial.println(lux);
  return lux;
}

// Method to read temperature
float readTemperature() {
  return dht.readTemperature();
}

// Method to read humidity
float readHumidity() {
  return dht.readHumidity();
}

// Method to display temperature and humidity on LCD
void displayTempHumidity(float temperature, float humidity) {
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print("C");

  lcd.setCursor(0, 1);
  lcd.print("Humidity: ");
  lcd.print(humidity);
  lcd.print("%");

  delay(2000);
  lcd.clear();
}

// Method to control LEDs based on temperature
void controlLEDs(float temperature) {
  if (temperature < 25) {
    digitalWrite(13, HIGH);
    digitalWrite(12, LOW);
    digitalWrite(11, LOW);
  } else if (temperature >= 25 && temperature < 35) {
    digitalWrite(13, LOW);
    digitalWrite(12, HIGH);
    digitalWrite(11, LOW);
  } else {
    digitalWrite(13, LOW);
    digitalWrite(12, LOW);
    digitalWrite(11, HIGH);
  }
}


void controlServo(int lux) {
  if (lux >= 500) {
    myServo.write(180); 
    
    //Serial.println("Servo rotated to 180 degrees.");
  } else {
    myServo.write(0);   
   // Serial.println("Servo rotated to 0 degrees.");
  }
}


void handleMotionSensor() {
  int motionDetected = digitalRead(PIR_PIN);
  if (motionDetected == HIGH) {
    Serial.println("Motion detected! Buzzer ON for 3 seconds.");
    tone(BUZZER_PIN, 250);  
    delay(3000);              
    noTone(BUZZER_PIN);      
  }
}