#include <LiquidCrystal.h>
LiquidCrystal lcd(13, 12, 11, 10, 9, 8);
int cislo = 0;
bool test = true;
int i = 0; // pozicia registra
void setup() {
  DDRD |= 0b11111111; // vystup
  DDRC |= 0b01111100;// A0 vstup a1 float
  lcd.begin(16,2);
  //you get input pullup when the bit in the DDRx register is 0 
  // while the same bit in PORTx is 1.
  PORTC |= 1<<0; //pull up
  randomSeed(analogRead(A1));
  Serial.begin(9600);

}

void loop() {
  if((PINC& (1<<0)) == 0 && test == true){
    cislo = random(0,10);
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print(cislo);
    Serial.println(cislo);

    test = false;
  }

  for(int i = 2; i <= cislo && i <8 ; i++)
  {
    PORTD |= 1<<i;
    delay(500);
  }
  PORTD &= 0b0000000;

   if((PINC& (1<<0)) != 0 && test == false){
    test = true;
  }
}