#define light 13
#define LED_PIN 18
bool g_lightOn = false;

// Include libraries
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include "DHT.h"

#define DEBUG 0  // Set to 1 for debugging statements

// Define ON/OFF values
#define ON  1  // Set to 0 if the logic is inverted
#define OFF 0  // Set to 1 if the logic is inverted

#if DEBUG == 1
#define debug(x) Serial.print(x)
#define debugln(x) Serial.println(x)
#else
#define debug(x)
#define debugln(x)
#endif
#define FIRE_THRESHOLD 30.0

// Thresholds for fan control
#define MaxTemperature 28  // Maximum temperature (in Celsius) to turn on the fan
#define MinTemperature 28  // Minimum temperature (in Celsius) to turn off the fan

// Pin configuration
#define led_pin 2          // Onboard LED pin
#define DHTPIN 4           // Pin to connect the DHT sensor to
#define fan_pin 5          // Pin to connect the fan to

// LCD definitions
#define refresh_rate 500   // Refresh rate of the LCD screen (in milliseconds)

// LCD display
LiquidCrystal_I2C lcd(0x27, 16, 2);  // Adjust the LCD address if necessary

// DHT sensor
DHT dht(DHTPIN, DHT22, 6);  // Change DHT22 to DHT11 if using a different sensor model

unsigned long prev = 0;  // Store the previous time
bool fan_status = false; // Flag to track the state of the fan
bool led_status = false; // Flag to track the state of the LED

// Function to turn the fan on/off
void fan_on(bool value)
{
    digitalWrite(fan_pin, value);
}

// Function to read sensor data and send to LCD
void read_send_Data()
{
    // Read temperature and humidity values from the sensor
    float temperature_ = dht.readTemperature();
    float f = dht.readTemperature(true);
    int humidity = dht.readHumidity();

    // Display sensor values on the LCD screen
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Temperature: ");
    lcd.print(temperature_, 1);
    lcd.print("C");
    lcd.setCursor(0, 1);
    lcd.print("Humidity: ");
    lcd.print(humidity);
    lcd.print("%");

    // Fan control
    if (temperature_ >= MaxTemperature)
    {
        fan_status = true;
        Serial.println("Fan ON");
        fan_on(ON);
    }
    else if (temperature_ < MinTemperature)
    {
        fan_status = false;
        Serial.println("Fan OFF");
        fan_on(OFF);
    }

    // Display fan status on LCD
    lcd.setCursor(0, 1);
    if (!fan_status)
        lcd.print("Temperature Normal, Fan: OFF");
    else
        lcd.print("Temperature High, Fan: ON");

    // Print sensor values to the serial monitor
    Serial.print("Humidity: ");
    Serial.print(humidity);
    Serial.print("% Temperature: ");
    Serial.print(temperature_);
    Serial.print(" C (");
    Serial.print(f);
    Serial.println(" F)");
}

void setup()
{
    // Initialize serial communication
    Serial.begin(9600);
    pinMode(LED_PIN, OUTPUT);  // Set LED_PIN as an output pin
  

    // Initialize the LCD display
    lcd.init();
    lcd.backlight();
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Starting...");

    Serial.println("Smart Temperature Fan System");  // Print system information to the serial monitor

    // Set pin modes
    pinMode(fan_pin, OUTPUT);
    pinMode(led_pin, OUTPUT);

    digitalWrite(led_pin, LOW);  // Turn off the LED

    // Make sure the fan is initially off
    fan_on(ON);

    lcd.setCursor(0, 1);
    lcd.print("Initialization Done");

    dht.begin();  // Initialize the DHT sensor

    Serial.println("Initialization Done");
    lcd.clear();
    delay(500);
}
  void controlLights() {
  const float GAMMA = 0.7;
  const float RL10 = 50;

  // Convert the analog value into lux value:
  int analogValue = analogRead(light);
  Serial.println(analogValue);
  

  if (analogValue > 1100 && analogValue < 2210) {
    if (!g_lightOn) {
      g_lightOn = true;
      digitalWrite(LED_PIN, HIGH);   // Turn on the LED
      Serial.println("LED on");
    }
  }
  else {
    if (g_lightOn) {
      g_lightOn = false;
      digitalWrite(LED_PIN, LOW);   // Turn off the LED
      Serial.println("LED off");
    }
  }
}


void loop()
{
    digitalWrite(led_pin, led_status);  // Control the LED

    if (millis() - prev > refresh_rate)
    {
        led_status = !led_status;  // Toggle the state of the LED
        read_send_Data();
        prev = millis();
        controlLights();  // Call the controlLights() function
  
}
delay(10);
    }