#include <LiquidCrystal_I2C.h>
#define I2C_ADDR 0x27
#define LCD_COLUMNS 20
#define LCD_LINES 4
LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

#define LDR_PIN 2
const float GAMMA = 0.7;
const float RL10 = 50;


#include <Stepper.h>
const int stepsPerRevolution = 200; 
const int targetPositionLight = 0; // Világos célpozíció (0 fok)
const int targetPositionDark = stepsPerRevolution; // Sötét célpozíció (180 fok)
Stepper myStepper(stepsPerRevolution, 8, 9, 10, 11);

void setup() {
  lcd.init();
  lcd.backlight();

pinMode(LDR_PIN, INPUT);

myStepper.setSpeed(60);
}

void loop() {
  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));

  lcd.setCursor(0, 0);
  lcd.print("Fenyero: ");
  if (lux > 50) {
    lcd.print("Vilagos");
    myStepper.step(stepsPerRevolution);
  } else {
    lcd.print("Sotet  ");
    myStepper.step(-stepsPerRevolution);
  }
  

  lcd.setCursor(0, 1);
  lcd.print("Lux: ");
  lcd.print(lux);
  lcd.print("          ");

  delay(100);

}