#include <LiquidCrystal.h>

LiquidCrystal lcd(2, 3, 4, 5, 6, 7);


int gomb1 = 8;
int gomb2 = 9;
int gomb3 = 10;
int gomb4 = 11;

int jelszo[4] = {4, 3, 1, 2}; 
int beirt[4] = {0, 0, 0, 0};   
int lenyomas = 0;            

void setup() {
  lcd.begin(16, 2);
  

  pinMode(gomb1, INPUT);
  pinMode(gomb2, INPUT);
  pinMode(gomb3, INPUT);
  pinMode(gomb4, INPUT);
  lcd.print("4 JEGYU KOD: ");
}

void loop() {
  
  int gomb1A = digitalRead(gomb1);
  int gomb2A = digitalRead(gomb2);
  int gomb3A = digitalRead(gomb3);
  int gomb4A = digitalRead(gomb4);

  
  if (gomb1A == HIGH && lenyomas < 4) {
    beirt[lenyomas] = 1;
    lcd.setCursor(lenyomas, 1);  
    lcd.print(beirt[lenyomas]);
    lenyomas++;
    delay(200);  
  }
  if (gomb2A == HIGH && lenyomas < 4) {
    beirt[lenyomas] = 2;
    lcd.setCursor(lenyomas, 1);
    lcd.print(beirt[lenyomas]);
    lenyomas++;
    delay(200);
  }
  if (gomb3A == HIGH && lenyomas < 4) {
    beirt[lenyomas] = 3;
    lcd.setCursor(lenyomas, 1);  
    lcd.print(beirt[lenyomas]);
    lenyomas++;
    delay(200);  
  }
  if (gomb4A == HIGH && lenyomas < 4) {
    beirt[lenyomas] = 4;
    lcd.setCursor(lenyomas, 1);  
    lcd.print(beirt[lenyomas]);
    lenyomas++;
    delay(200);  
  }


  if (lenyomas == 4) {
    if (beirt[0] == jelszo[0] && beirt[1] == jelszo[1] && beirt[2] == jelszo[2] && beirt[3] == jelszo[3]) {
      lcd.clear();
      lcd.print("OK");
    } else {
      lcd.clear();
      lcd.print("STOP");
    }


    delay(2000);  
    lenyomas = 0;
    for (int i = 0; i < 4; i++) {
      beirt[i] = 0;  
    }
    lcd.clear();
    lcd.print("4 JEGYU KOD:");  
  }

  delay(100);  
}