#include <LiquidCrystal.h>

LiquidCrystal lcd(13,12,11,10,9,8);

byte character[8] = {
  B11111,
  B10101,
  B10101,
  B11111,
  B10101,
  B10101,
  B11111,
};

void setup() {

  Serial.begin(9600);

  //CERVENY BUTTON
  pinMode(7, INPUT);
  digitalWrite(7, HIGH);

  //MODRY BUTTON
  pinMode(6, INPUT);
  digitalWrite(6, HIGH);

  //ZLTY BUTTON
  pinMode(5, INPUT);
  digitalWrite(5, HIGH);

  //SEDY BUTTON
  pinMode(4, INPUT);
  digitalWrite(4, HIGH);

  lcd.begin(20,4);
  lcd.createChar(0, character);
  lcd.setCursor(1,3);
  lcd.write(byte(0));

}

bool t1=true;
bool t2=true;
bool t3=true;
bool t4=true; 

int col=1;
int row=3;


void loop() {
  
  //CERVENY
  if(digitalRead(7) == LOW && t1 == true)
  {
    t1=false;

    if(row-1 != -1) row--;

    lcd.clear();
    
    lcd.setCursor(col,row);
    lcd.write(byte(0));
   

  }

  if(digitalRead(7) == HIGH) t1=true;


  //MODRY
  if(digitalRead(6) == LOW && t2==true)
  {
    t2=false;

    if(row+1 != 4) row++;

    lcd.clear();
    
    lcd.setCursor(col,row);
    lcd.write(byte(0));
    
  }

  if(digitalRead(6) == HIGH) t2=true;


  //ZLTY
  if(digitalRead(5) == LOW && t3==true)
  {
    t3=false;
    if(col-1 != -1) col--;

    lcd.clear();

    lcd.setCursor(col,row);
    lcd.write(byte(0));
   
  }

  if(digitalRead(5) == HIGH) t3= true;


  //SEDY
  if(digitalRead(4) == LOW && t4 == true)
  {
    t4=false;

    if(col+1 != 20) col++;
    lcd.clear();
    lcd.setCursor(col,row);
    lcd.write(byte(0));;
    
  } 

  if(digitalRead(4) == HIGH) t4= true;


}