#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);

#define BUTTON 6
#define LIMIT 20

uint8_t cas = LIMIT+1;
boolean stav = true; //1- bezi, 0-stoji

unsigned long previousMillis = 0;

int buttonState = LOW;
int lastButtonState = LOW;
unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 50;

byte i=0;

byte tulipan[8] = {
	0b01010,
	0b01110,
	0b01110,
	0b00100,
	0b00101,
	0b00111,
	0b00110,
	0b00100
};

void setup() {
  pinMode(BUTTON, INPUT);
  lcd.init();//lcd.backlight();
  lcd.backlight();
  lcd.createChar(0, tulipan); // create a new custom character
  /*lcd.setCursor(1, 0); // move cursor to (2, 0)
  lcd.write((byte)0);  // print the custom char at (2, 0)*/

  
}

void loop() {
  unsigned long currentMillis = millis();
  if(currentMillis-previousMillis >=1000 && stav){
    previousMillis = currentMillis;
    lcd.setCursor(5,1);
    zobraz();
  }
   if(cas==0){
    stav = false;
    tone(4,262,1000);
  }
  int reading = digitalRead(BUTTON);
  
  if((millis()- lastDebounceTime)>debounceDelay){
    if(reading != buttonState){
      buttonState = reading;

      if(buttonState == HIGH){
        stav= true;
        cas = LIMIT+1;
        previousMillis = millis();
        zobraz();
      }
    }
  }
  lastButtonState = reading;

}
void zobraz(){
  lcd.clear();
  String text =(cas<=10)?" "+String(--cas):String(--cas); 
    
  lcd.setCursor(16-text.length(),0);
  lcd.print(text);

  lcd.setCursor(i, 1); // move cursor to (2, 0)
  i=(++i%16);
  lcd.write((byte)0);
}