// Include LiquidCrystal_I2C library to control an LCD screen via I2C
#include <LiquidCrystal_I2C.h> 

// Define the pins for the LEDs
const int blueLedPin = 13;
const int greenLedPin = 10;
const int redLedPin = 7;

// Define the analog pin for the temperature sensor
const int tempSensor = A0;

// Define the constant for the BETA coefficient
const int BETA = 3950;

// Create the LCD object with I2C library address 0x27, 16 columns, and 2 rows
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() 
{   
  // Set the LED pins as outputs
  pinMode(blueLedPin, OUTPUT);
  pinMode(greenLedPin, OUTPUT);
  pinMode(redLedPin, OUTPUT);

  // Initialize the LCD
  lcd.init();

  // Turn on the LCD backlight
  lcd.backlight();
}

void loop() 
{
  // Read the analog value from the temperature sensor
  int val = analogRead(tempSensor);

  // Convert the analog value to temperature in Celsius using the BETA coefficient
  float temp = 1 / (log(1 / (1023.0 / val - 1)) / BETA + 1.0 / 298.15) - 273.15;

  // Set the cursor to the first row and first column
  lcd.setCursor(0, 0);

  // Print "Condition" on the LCD
  lcd.print("Condition:");

  // Check if the temperature is above 25°C
  if (temp > 25)
  {
    lcd.print(" High!");
    digitalWrite(redLedPin, HIGH);
    digitalWrite(blueLedPin, LOW);
    digitalWrite(greenLedPin, LOW);
  }
  // Check if the temperature is 18°C or below
  else if (temp <= 18)
  {
    lcd.print("  Low!");
    digitalWrite(redLedPin, LOW);
    digitalWrite(blueLedPin, HIGH);
    digitalWrite(greenLedPin, LOW);
  }
  // Otherwise print "Normal"
  else
  {
    lcd.print("Normal");
    digitalWrite(redLedPin, LOW);
    digitalWrite(blueLedPin, LOW);
    digitalWrite(greenLedPin, HIGH);
  }

  // Set the cursor to the second row and first column
  lcd.setCursor(0, 1);

  // Print "Room Temp: " on the LCD
  lcd.print("Room Temp: ");

  // Print the temperature value on the LCD
  lcd.print(temp, 1); // Display temperature with 1 decimal point

  // Wait for 1 second
  delay(1000);
}