#include <LiquidCrystal_I2C.h>
#include <Servo.h>
#include "DHT.h"
#include <Stepper.h>

#define DHTTYPE DHT22 
#define DHTPIN 7

#define LDR_PIN 2
#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4


int LED1 = 14;

// LDR Characteristics
const float GAMMA = 0.7;
const float RL10 = 50;

const int triggerPin = 2;   // Trigger pin of the ultrasonic sensor
const int echoPin = 3;      // Echo pin of the ultrasonic sensor
const int servoPin = 9;     // Servo control pin



LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);
DHT dht(DHTPIN, DHTTYPE);
Stepper myStepper(200, 10, 11, 12, 13);
uint8_t heart[8] = {
  0b00000,
  0b01010,
  0b11111,
  0b11111,
  0b11111,
  0b01110,
  0b00100,
  0b00000,
};
uint8_t Object[8] = {
0b00000,
  0b00000,
  0b01110,
  0b11011,
  0b11100,
  0b01110,
  0b00000,
  0b00000
};

Servo myServo;

void DisplayGroupName() {
  lcd.createChar(3, heart);
  lcd.setCursor(3, 0);
  lcd.print("  \x03 Group 6 \x03");

}

void setup() {
  //Serial.begin(9600);
  pinMode(LDR_PIN, INPUT);
  pinMode(LED1, OUTPUT);
  pinMode(triggerPin, OUTPUT);    //ultrasonic
  pinMode(echoPin, INPUT);        //ultrasonic
  myServo.attach(servoPin);
  myServo.write(0);  // Initial position of the servo (closed door)
  dht.begin();

  lcd.init();
  lcd.backlight();
  DisplayGroupName();
}

float calculateLux() {
  //digitalWrite(LED1, HIGH);
  int analogValue = analogRead(A0);
  float voltage = analogValue / 1024. * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
  return lux;
}
void LightOnCheck( float claculatedLux, float PreviousLux) {
  if (claculatedLux > 400) {
    
    if(PreviousLux != claculatedLux) {
      lcd.setCursor(0, 1);
      digitalWrite(LED1, LOW);
      lcd.print("Light - OFF");
      

    }
    
  } else {
    if(PreviousLux != claculatedLux) {
      digitalWrite(LED1, HIGH);
      lcd.setCursor(0, 1);
      lcd.print("Light - ON ");
      PreviousLux = claculatedLux;
    }
  }
}
void heartAnimation(){
    // Heart Design - Not mandatory code
  uint8_t heart2[8] = {0};
  for (int i = 0; i < 8; i++) {
    heart2[i] = heart[i];
    lcd.createChar(3, heart2);
    delay(10);
  }
}
long distanceCalculation() {
  long duration = 0,distance =0;
  // Trigger the ultrasonic sensor
  digitalWrite(triggerPin, LOW);
  delayMicroseconds(2);
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerPin, LOW);
  
  // Measure the echo duration to calculate distance
  duration = pulseIn(echoPin, HIGH);
  distance = (duration * 0.0343) / 2; // Calculate distance in centimeters
  return distance;

}
void DoorOpenCheck(long distance) {
  if (distance <= 200) { // If someone is close to the doorway
    myServo.write(90); // Open the door (rotate servo by 90 degrees)
    // Fan speed Check
    calculateHum();
    //calculateTemp();
    controlFanSpeed();
    calculateHum();
    //calculateTemp();
    controlFanSpeed();
    delay(1000); // Keep the door open for 2 seconds
    myServo.write(0); // Close the door (return servo to initial position)
    //delay(1000); // Wait for 1 second before next iteration
  }

}

float humidity = 0.0, temprature = 0;
int fanspeed  = 0;
void calculateHum (){

    // Reading temperature or humidity takes about 250 milliseconds!
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  humidity = dht.readHumidity();
  // Read temperature as Celsius (the default)
  temprature = dht.readTemperature();
  // Read temperature as Fahrenheit (isFahrenheit = true)
  float f = dht.readTemperature(true);

  // Check if any reads failed and exit early (to try again).
  if (isnan(humidity) || isnan(temprature) || isnan(f)) {
   // Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

  // Compute heat index in Fahrenheit (the default)
  //float hif = dht.computeHeatIndex(f, h);
  // Compute heat index in Celsius (isFahreheit = false)
  //float hic = dht.computeHeatIndex(t, h, false);

  /*Serial.print(F("Humidity: "));
  Serial.print(h);
  Serial.print(F("%  Temperature: "));
  Serial.print(t);
  Serial.print(F("°C "));
  Serial.print(f);
  Serial.print(F("°F  Heat index: "));
  Serial.print(hic);
  Serial.print(F("°C "));
  Serial.print(hif);
  Serial.println(F("°F"));*/

}


void controlFanSpeed(){
  
  if(temprature <= 25.0) {
    fanspeed = 0;
  } else if(temprature > 25.0 && temprature< 30 ) {
    fanspeed = 2;

  }  else if(temprature >=30  && temprature< 35 ) {
    fanspeed = 3;

  } else if(temprature >= 35.0 && temprature< 40 ) {
    fanspeed = 4;

  } else {
    fanspeed = 5;

  }

   myStepper.setSpeed(map(fanspeed, 0, 5, 0, 200));
   myStepper.step(map(fanspeed, 0, 5, 0, 200));
  
}

void loop() {
  
  // Varibles to hold sensor values
  float claculatedLux = 0.0, PreviousLux = 0.0;
  long distance =0.0;      //ultrasonic
 

  // Door-Check logic
  distance = distanceCalculation();
  DoorOpenCheck(distance);
  
  // Lux-Check logic
  claculatedLux =  calculateLux();
  LightOnCheck( claculatedLux,   PreviousLux);
  PreviousLux = claculatedLux;

  // Fan speed Check
  calculateHum();
  //calculateTemp();
  controlFanSpeed();
  
  //Serial.print("Distance: ");
  //Serial.println(distance);


  lcd.setCursor(0, 3);
  lcd.print("Lux:");
  lcd.print(claculatedLux);
  lcd.print(" Temp:");
  lcd.print(temprature);
  
  lcd.createChar(1, Object);
  lcd.setCursor(0, 2);
  if (distance <= 400) {
    lcd.print("\1in:");
    lcd.print(distance);
    lcd.print("cm ");
  }
  lcd.print(" Hum:");
  lcd.print(humidity);

  lcd.setCursor(12, 1);
  lcd.print(" Fan: ");
    
  lcd.print(fanspeed);

 // Serial.print("Lux: ");
 // Serial.print(claculatedLux);
 // Serial.println(" ");
  heartAnimation();
  //delay(1);
}