#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C a(0x27, 20,4);

byte panak[] = {
  B01110,
  B01110,
  B01010,
  B01010,
  B10001,
};

int pole[] = {0,0};
int randomstlepc;
int randomriadok;

bool test1 = true;
bool test2 = true;
bool test3 = true;
bool test4 = true;

void setup() {

  pinMode(2, INPUT_PULLUP);
  pinMode(3, INPUT_PULLUP);
  pinMode(4, INPUT_PULLUP);
  pinMode(5, INPUT_PULLUP);


  a.init();
  a.backlight();
  a.createChar(0, panak);
  a.home();
  a.write(0);

  randomSeed(analogRead(A0));
  randomstlepc = random(0,19);
  randomriadok = random(0,3);
  a.setCursor(randomstlepc, randomriadok);
  a.write(1);


}

void loop() {

//pohyb do prava

  if(digitalRead(3) == LOW && test2 == true){ 
    a.setCursor(pole[1], pole[0]);
    a.print(" ");
    pole[1]++;
    if(pole[1] > 19){
      pole[1] = 0;
    }
    a.setCursor(pole[1], pole[0]);
    a.write(0);
    test2 = false;
  }  
  else if(digitalRead(3) == HIGH && test2 == false)
  {
    test2 = true;
  }

// pohyb v lavo

  if( digitalRead(4) == LOW && test4 == true){ 
    a.setCursor(pole[1], pole[0]);
    a.print(" ");
    pole[1]--;
    if(pole[1] < 0){
      pole[1] = 19;
    }
    a.setCursor(pole[1], pole[0]);
    a.write(0);
    test4 = false;
  }
    else if(digitalRead(4) == HIGH && test4 == false)
  {
    test4 = true;
  }

//pohyb dole

if (digitalRead(2) == LOW && test1 == true) { 
    a.setCursor(pole[1], pole[0]);
    a.print(" ");
    pole[0]++;
    if (pole[0] > 3) {
        pole[0] = 0;
    }
    a.setCursor(pole[1], pole[0]);
    a.write(0);
    test1 = false; 
}
else if (digitalRead(2) == HIGH && test1 == false) {
    test1 = true;
}


//pohyb hore

    if(digitalRead(5) == LOW && test3 == true){
      a.setCursor(pole[1], pole[0]);
      a.print(" ");
      pole[0]--;
      if(pole[0] < 0){
        pole[0] = 3;
      }
      a.setCursor(pole[1], pole[0]);
      a.write(0);
      test3 = false;
    }
    else if(digitalRead(5) == HIGH && test3 == false)
    {
      test3 = true;
    }
}