#include <Arduino.h>
#include <AccelStepper.h>
#include <LiquidCrystal_I2C.h>
#include "RTClib.h"
RTC_DS1307 rtc;
LiquidCrystal_I2C lcd(0x27, 16, 2);
const int stepPin = 5;
const int dirPin = 4;
const int enablePin = 12;
const int photoResistorPin = A0;
const float GAMMA = 0.7;
const float RL10 = 50;
const long MAX_POSITION = 10000; 
const long MIN_POSITION = 0;    
float lux;
AccelStepper stepper(1, stepPin, dirPin);
long currentPosition = 0; 

void setup() {
  lcd.init();
  lcd.backlight();
  pinMode(enablePin, OUTPUT);
  digitalWrite(enablePin, HIGH); 
  stepper.setMaxSpeed(1000); 
  stepper.setAcceleration(500); 
  rtc.begin();
  stepper.setCurrentPosition(0); 
}

void loop() {
  int analogValue = analogRead(photoResistorPin);
  float voltage = analogValue / 1024.0 * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
  DateTime now = rtc.now();
  lcd.setCursor(0, 0);
  lcd.print("Light: ");
  lcd.print(lux);
  lcd.setCursor(0, 1);
  lcd.print(now.hour(), DEC);
  lcd.print(':');
  lcd.print(now.minute(), DEC);
  lcd.print(':');
  lcd.print(now.second(), DEC);
  currentPosition = stepper.currentPosition();
  if (lux > 700 && currentPosition < MAX_POSITION) {
    digitalWrite(enablePin, LOW); 
    stepper.setSpeed(100); 
  } else if (lux < 300 && currentPosition > MIN_POSITION) {
    digitalWrite(enablePin, LOW); 
    stepper.setSpeed(-100); 
  } else {
    digitalWrite(enablePin, HIGH); 
    stepper.setSpeed(0); 
  }
  stepper.runSpeed();
}