#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Servo.h> // Include the Servo library

// Initialize the LCD with the I2C address (usually 0x27)
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Define the analog pin connected to the thermistor
const int thermistorPin = A0;

// Define the digital pins connected to the LED
const int redPin = 11;    // Red pin of the LED
const int greenPin = 10;  // Green pin of the LED
const int bluePin = 9;    // Blue pin of the LED

// Define servo pin
const int servoPin = 3; // Choose the pin for the servo control

// Parameters for the thermistor and resistor
const float BETA = 3950; // Beta coefficient of the thermistor

// Temperature thresholds for the LED and servo control
const float coldThreshold = 16.0;  // Below this temperature, the green and red LED will be off
const float mediumThreshold = 40.0; // Between coldThreshold and mediumThreshold, the green LED will on
const float hotThreshold = 50.0;    // Above this temperature, the red LED will on

// Servo objects for fan
Servo fanServo;


void setup() {
  // Initialize I2C communication
  Wire.begin();
  
  // Initialize the LCD
  lcd.begin(16, 2);
  lcd.backlight();
  lcd.print("Temperature: ");
  
  // Initialize serial communication
  Serial.begin(9600);

  // Initialize the LED pins as outputs
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);

  // Initialize the servo pins
  fanServo.attach(servoPin);

  // Ensure all LEDs are off initially
  digitalWrite(redPin, LOW);
  digitalWrite(greenPin, LOW);
  digitalWrite(bluePin, LOW);

  // Set initial positions for the servos
  fanServo.write(0); // Fan off
}

void loop() {
  int analogValue = analogRead(thermistorPin);
  float celsius = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
  
  // Print the temperature to the LCD
  lcd.setCursor(0, 1);
  lcd.print(celsius);
  lcd.print(" C  ");

  // Ensure all LEDs are off initially
  digitalWrite(redPin, LOW);
  digitalWrite(greenPin, LOW);
  digitalWrite(bluePin, LOW);

  // Control the LED based on the temperature
  if (celsius < coldThreshold) {
    // Set LED Blue for Cold and stay on
    digitalWrite(redPin, LOW);
    digitalWrite(greenPin, LOW);
    digitalWrite(bluePin, HIGH);
    
    // Turn off the fan
    fanServo.write(0);
    
  } else if (celsius < mediumThreshold) {
    // Set LED Green for medium and stay on
    digitalWrite(redPin, LOW);
    digitalWrite(greenPin, HIGH);
    digitalWrite(bluePin, LOW);
    
    // Turn on the fan with medium speed
    fanServo.write(90);
    
  } else {
    // Set LED Red for Hot and stay on
    digitalWrite(bluePin, LOW);
    digitalWrite(greenPin, LOW);
    digitalWrite(redPin, HIGH);
    
    // Turn on the fan with high speed
    fanServo.write(180);
    
  }

  delay(1000);
}