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

/*posuvny register*/
#define latchpin 4
#define datapin 3
#define clockpin 5
uint8_t pattern=0b00000001;

/*tlacidlo*/
const int buttonPin = 2;
int buttonState = LOW;
int lastButtonState = LOW;
long lastDebounceTime = 0;
long debounceDelay = 50;
int mody=0;


void setup() {
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("Vypnute");

  pinMode(buttonPin, INPUT);

  pinMode(latchpin, OUTPUT);
  pinMode(datapin, OUTPUT);
  pinMode(clockpin, OUTPUT);
  Serial.begin(9600);
}

void loop() {
 digitalWrite(latchpin, LOW);
  shiftOut(datapin, clockpin, LSBFIRST, pattern);
  digitalWrite(latchpin, HIGH);
  

  int reading = digitalRead(buttonPin);
    if (reading != lastButtonState) {
        lastDebounceTime = millis();
    }
    if ((millis() - lastDebounceTime) > debounceDelay) {
        if (reading != buttonState) {
            buttonState = reading;
            if (buttonState == HIGH) {
                mody=mody+1;
                Serial.println(mody);
                if(mody==6){
                  mody=0;
                  sviet();
                }
            }
        }
    }
    lastButtonState = reading;
}
void sviet(){


}