#include <LiquidCrystal.h>
#include <DHT.h>

// pin connections
#define DHTPIN 8         // DHT sensor pin
#define DHTTYPE DHT22    // DHT sensor type
#define RS_PIN 7         // LCD RS pin
#define E_PIN 6          // LCD enable pin
#define D4_PIN 5         // LCD D4 pin
#define D5_PIN 4         // LCD D5 pin
#define D6_PIN 3         // LCD D6 pin
#define D7_PIN 2         // LCD D7 pin

//  LED pins
#define RED_LED 10       // Red LED pin
#define GREEN_LED 11     // Green LED pin
#define BLUE_LED 12      // Blue LED pin

// Initialisation of DHT sensor
DHT dht(DHTPIN, DHTTYPE);

// Initialize the LCD
LiquidCrystal lcd(RS_PIN, E_PIN, D4_PIN, D5_PIN, D6_PIN, D7_PIN);

void setup() {
  // Start the serial communication
  Serial.begin(9600);

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

  // Initialize the LCD
  lcd.begin(16, 2);

  lcd.print("Initializing...");
    delay(500);
    lcd.clear();

  // Initialize the LED pins as outputs
  pinMode(RED_LED, OUTPUT);
  pinMode(GREEN_LED, OUTPUT);
  pinMode(BLUE_LED, OUTPUT);
}

void loop() {
  // Read humidity and temperature
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  // Check if any reads failed
  if (isnan(humidity) || isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  // Print temperature and humidity values to serial monitor
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.print(" %\t Temperature: ");
  Serial.println(temperature);

  // Display temperature and humidity on LCD
  lcd.clear();
  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(" %");

  // LEDs lights based on temperature range
  if (temperature > 30) {
    digitalWrite(RED_LED, HIGH);
    digitalWrite(GREEN_LED, LOW);
    digitalWrite(BLUE_LED, LOW);
  } else if (temperature >= 20 && temperature <= 30) {
    digitalWrite(RED_LED, LOW);
    digitalWrite(GREEN_LED, HIGH);
    digitalWrite(BLUE_LED, LOW);
  } else if (temperature < 20) {
    digitalWrite(RED_LED, LOW);
    digitalWrite(GREEN_LED, LOW);
    digitalWrite(BLUE_LED, HIGH);
  }

  // Delay
  delay(2500);
}