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

#define DHTPIN 13          // Pin connected to the DHT sensor
#define DHTTYPE DHT22      // Type of DHT sensor (DHT22 in this case)
#define PPM_PIN 4          // Analog pin connected to the PPM sensor

DHT dht(DHTPIN, DHTTYPE);  // Create a DHT object
LiquidCrystal_I2C lcd(0x27, 16, 2);  // Create an LCD object

const int capteurLumierePin = 35;  // Pin connected to the light sensor
const int ledRed = 12;              // Pin connected to the red LED
const int ledGreen = 14;            // Pin connected to the green LED

void setup() {
  Serial.begin(115200);  // Start serial communication
  dht.begin();            // Initialize the DHT sensor
  lcd.init();             // Initialize the LCD
  lcd.backlight();        // Turn on the backlight of the LCD
  pinMode(ledRed, OUTPUT);    // Set red LED pin as output
  pinMode(ledGreen, OUTPUT);  // Set green LED pin as output
  pinMode(2, OUTPUT);         // Set pin 2 as output
}

void loop() {
  delay(2000);  // Delay before each sensor reading

  // Read temperature and humidity from DHT sensor
  float temp = dht.readTemperature();  // Read temperature
  float hum = dht.readHumidity();      // Read humidity

  // Read PPM value from analog pin
  int16_t ppmValue = analogRead(PPM_PIN);           // Read analog value from PPM sensor
  float voltage = ppmValue * (5.0 / 1023.0);        // Convert analog value to voltage
  float ppm = voltage * 1000;                       // Convert voltage to PPM assuming linear relationship

  // Read light sensor value
  int valeurLuminosite = analogRead(capteurLumierePin);  // Read analog value from light sensor

  // Control LEDs based on temperature and humidity readings
  if (temp > 27 || hum > 70) {
    // Blink the red LED in case of high temperature or humidity
    for (int i = 0; i < 5; i++) {    // Blink 5 times
      digitalWrite(ledRed, HIGH);     // Turn on the red LED
      delay(100);                     // Wait for 100 milliseconds
      digitalWrite(ledRed, LOW);      // Turn off the red LED
      delay(100);                     // Wait for 100 milliseconds
    }
    digitalWrite(ledGreen, LOW);    // Turn off the green LED
    Serial.println("Warning: High temperature or humidity detected!!!!!");  // Print warning message
  } else {
    // Blink the green LED if temperature and humidity are within normal range
    for (int i = 0; i < 5; i++) {    // Blink 5 times
      digitalWrite(ledGreen, HIGH);   // Turn on the green LED
      delay(100);                     // Wait for 100 milliseconds
      digitalWrite(ledGreen, LOW);    // Turn off the green LED
      delay(100);                     // Wait for 100 milliseconds
    }
    digitalWrite(ledRed, LOW);      // Turn off the red LED
    Serial.println("Temperature and humidity within normal range.");  // Print normal range message
  }

  // Display sensor readings on LCD
  displaySensorReadings(temp, hum);

  // Display PPM value and light status on LCD with animation
  displayPPMAndLight(ppm, valeurLuminosite);

  delay(1500);  // Adjust delay as needed
}

// Function to display temperature and humidity on LCD
void displaySensorReadings(float temp, float hum) {
  lcd.clear();                  // Clear the LCD screen
  lcd.setCursor(0, 0);         // Set cursor to the first line
  lcd.print("Temp: ");         // Display "Temp: "
  lcd.print(temp);             // Display temperature
  lcd.print(" C");             // Display unit for temperature

  lcd.setCursor(0, 1);         // Set cursor to the second line
  lcd.print("Humidity: ");     // Display "Humidity: "
  lcd.print(hum);              // Display humidity
  lcd.print(" %");             // Display unit for humidity
}

// Function to display PPM value and light status on LCD with animation
void displayPPMAndLight(float ppm, int valeurLuminosite) {
  lcd.clear();                   // Clear the LCD screen
  lcd.setCursor(0, 0);          // Set cursor to the first line
  lcd.print("AIR QU: ");        // Display "AIR QU: "
  lcd.print(ppm);               // Display PPM value
  lcd.print(" PPM: ");          // Display unit for PPM

  lcd.setCursor(0, 1);         // Set cursor to the second line
  lcd.print("Light: ");        // Display "Light: "
  if (valeurLuminosite < 1000) {
    lcd.print("Closed");       // If light is low, display "Closed"
  } else {
    lcd.print("Open");         // If light is high, display "Open"
  }
}