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

#define DHTPIN 12    // Pin connected to DHT11 sensor
#define DHTTYPE DHT22  // DHT 11
#define servoPin 9        // PWM pin connected to the servo

DHT dht(DHTPIN, DHTTYPE);   // Initialize DHT sensor
LiquidCrystal_I2C lcd(0x27, 16, 2);   // Initialize I2C LCD with address 0x27, 16 columns, and 2 rows
byte degree[8] = {
  B00100,
  B01010,
  B00100,
  B00000,
  B00000,
  B00000,
  B00000,
  B00000
};

Servo myServo;  // Create a Servo object

void setup() {
  lcd.begin(16, 2);   // Initialize the LCD with 16 columns and 2 rows
  lcd.createChar(1, degree);   // Create a custom degree symbol
  lcd.clear();   // Clear LCD screen
  lcd.print("Temperature-Based");   // Display initial message
  lcd.setCursor(0, 1);
  lcd.print("Fan Speed Controller");
  delay(2000);
  myServo.attach(servoPin);  // Attach the servo to the specified pin
  myServo.write(0);  // Set the initial position of the servo
  lcd.clear();
  lcd.print("Detecting.....");
  delay(2000);
  Serial.begin(9600);   // Initialize serial communication
  dht.begin();   // Start DHT sensor
}

void loop() {
  // Read temperature and humidity from DHT sensor
  float h = dht.readHumidity();   // Read humidity
  float t = dht.readTemperature();   // Read temperature in Celsius
  float f = dht.readTemperature(true);   // Read temperature in Fahrenheit
  
  // Check if any reads failed
  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  // Compute heat index
  float hi = dht.computeHeatIndex(f, h);

  // Print temperature and humidity readings to the serial monitor
  Serial.print("Humidity: ");
  Serial.print(h);
  Serial.print(" %\t");
  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.print(" ");
  Serial.print((char)223); // Degree symbol
  Serial.print("C ");
  Serial.print(f);
  Serial.print(" ");
  Serial.print((char)223); // Degree symbol
  Serial.print("F\t");
  Serial.print("Heat index: ");
  Serial.print(hi);
  Serial.print(" ");
  Serial.print((char)223); // Degree symbol
  Serial.println("F");

  // Display temperature and humidity on the I2C LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(t);
  lcd.print((char)223); // Degree symbol
  lcd.print("C   ");
  lcd.setCursor(0, 1);
 

  // Calculate fan speed based on temperature range
  int fanSpeed = map(t, 20, 30, 0, 100);

  // Control servo position based on temperature
  int servoPosition = map(t, 20, 30, 0, 180);  // Map temperature to servo position (0-180 degrees)
  myServo.write(servoPosition);  // Set the servo to the calculated position

  // Display fan speed on the I2C LCD
  lcd.setCursor(0, 1);
  lcd.print("Fan Speed: ");
  lcd.print(fanSpeed);
  lcd.print("%");

  delay(3000); // Delay between readings
}