#include <LiquidCrystal_I2C.h>
#include <Wire.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
int btnleft = 2;
int btnright = 3;
int btnenter = 4;
int pot = A0;
int value1 = 0, value2 = 0, value3 = 0, value4 = 0;
int w = 3;
String password = "1234";
int Gled = 7;
int Rled = 6;

void setup() {
  lcd.init();
  lcd.backlight();
  Serial.begin(9600);
  pinMode(btnleft, INPUT);
  pinMode(btnright, INPUT);
  pinMode(btnenter, INPUT);
  pinMode(Gled, OUTPUT);
  pinMode(Rled, OUTPUT);
}

void loop() {
  int deyer = analogRead(pot);
  int value = map(deyer,0,1023,0,9);
  lcd.setCursor(0,0);
  lcd.print("<");
  lcd.print(value1);
  lcd.print(">");
  lcd.setCursor(4, 0);
  lcd.print("<");
  lcd.print(value2);
  lcd.print(">");
  lcd.setCursor(9, 0);
  lcd.print("<");
  lcd.print(value3);
  lcd.print(">");
  lcd.setCursor(13,0);
  lcd.print("<");
  lcd.print(value4);
  lcd.print(">");
  if(digitalRead(btnleft) == HIGH){
    w--;
  }
  if(digitalRead(btnright) == HIGH){
    w++;
  }
  if(w == 1){
    lcd.setCursor(1,1);
    lcd.print("-");
    delay(200);
    lcd.setCursor(1,1);
    lcd.print(" ");
    delay(200);
    value1 = value;
  }
  else if(w == 2){
    lcd.setCursor(5,1);
    lcd.print("-");
    delay(200);
    lcd.setCursor(5,1);
    lcd.print(" ");
    delay(200);
    value2 = value;
  }
  else if(w == 3){
    lcd.setCursor(10,1);
    lcd.print("-");
    delay(200);
    lcd.setCursor(10,1);
    lcd.print(" ");
    delay(200);
    value3 = value;
  }
  else if(w == 4){
    lcd.setCursor(14,1);
    lcd.print("-");
    delay(200);
    lcd.setCursor(14,1);
    lcd.print(" ");
    delay(200);
    value4 = value;
  }
  String code = String(value1) + String(value2) + String(value3) + String(value4);
  if(digitalRead(btnenter) == HIGH){
    if(code == password){
      digitalWrite(Gled, HIGH);
      delay(1000);
      digitalWrite(Gled, LOW);
    }
    else{
      digitalWrite(Rled, HIGH);
      delay(1000);
      digitalWrite(Rled, LOW);
    }
  }
  Serial.println(code);
}