#include <LiquidCrystal_I2C.h>
#include <DHT.h>
#include <Servo.h>
#include <AccelStepper.h>
#include <math.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);
Servo myservo;

// DHT Sensor
#define DHTPIN 5 // DHT22 data pin connected to digital pin 5
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// Misc Definitions
int buzzer = 4;
int LED = 13;
int button = 2;
int lightSensor = A0;
int potentiometer = A3;
int servo = 3;
int relay = 7;
int readTime = 1000;
int pirPin = 6;

// Motion Sensor
int pirState = LOW;
int value = 0;

// Stepper Motor
int dirPin = 10;
int stepPin = 9;
bool direction = 1;

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


void setup() {
  dht.begin();
  lcd.init();
  lcd.backlight();
  pinMode(buzzer, OUTPUT);
  pinMode(LED, OUTPUT);
  pinMode(button, INPUT_PULLUP);
  myservo.attach(servo);
  pinMode(relay, OUTPUT);
  pinMode(potentiometer, INPUT);
  pinMode(dirPin, OUTPUT);
  pinMode(stepPin, OUTPUT);
}

void loop() {
  float LDR = analogRead(lightSensor);
  float voltage = LDR / 1024. * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));

  int input = analogRead(potentiometer);
  int level = map(input,0,1023,0,100000);
  if (lux < level) {
    myservo.write(0); // closes curtain
    digitalWrite(LED, HIGH);
    lcd.print("Curtain Closed");
    delay(readTime);
    lcd.clear();
  }
  else {
    myservo.write(90); // opens curtain
    digitalWrite(LED, LOW);
    lcd.print("Curtain Opened");
    delay(readTime);
    lcd.clear();
  }
  bool buttonState = digitalRead(button);
  digitalWrite(relay, !buttonState);
  if (buttonState) lcd.write("Appliance Deactivated");
  if (!buttonState) lcd.write("Appliance Activated");
  delay(readTime);
  lcd.clear();

  int value = digitalRead(pirPin);
  int motionDetectedTime = 0;
  if (value) {
    motionDetectedTime = millis();
    if (!pirState) {
      pirState = HIGH;
      tone(buzzer, 500);
      lcd.print("Motion detected");
      delay(2000);
      lcd.clear();
      noTone(buzzer);
    }
    } else {
      if (pirState) {
      pirState = LOW;
    }
    }

}