#include <LiquidCrystal.h>

LiquidCrystal lcd(10,9,7,6,5,4);

String pole[] = {"M1", "M2", "M3", "M4"};

bool t = true;
bool tt = true;
int index = 0;
bool firstTime = true;

void setup() {
  pinMode(13, INPUT);
  digitalWrite(13, HIGH);
  pinMode(12, INPUT);
  digitalWrite(12, HIGH);

  lcd.begin(16,2);
}

void loop() {
  if(digitalRead(13) == LOW && t == true)
  {
    t=false;

    if(firstTime == true) {index--; firstTime = false;}

    index++;
    if(index == 4)   {index=0;}
    lcd.clear();
    
    lcd.setCursor(5,0);
    lcd.print("MENU");
    lcd.setCursor(6,2);
    lcd.print(pole[index]);

    
  }

  if(digitalRead(13) == HIGH)
  t = true;

  if(digitalRead(12) == LOW && tt == true)
  {
    tt = false;

    

    if(firstTime == true) {index=4; firstTime = false;}

    index--;
    if(index == -1)   {index=3;}
    lcd.clear();

    lcd.setCursor(5,0);
    lcd.print("MENU");
    lcd.setCursor(6,2);
    lcd.print(pole[index]);

    


  }

  if(digitalRead(12) == HIGH)
  tt = true;
}