#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#define CLK 52
#define DT 50
#define SW 48

LiquidCrystal_I2C lcd(0x27,20,4);

int counter = 0;
int state;
int lastState;
int volba;

void setup()
{
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  Serial.begin(9600);

  pinMode(CLK,INPUT);
  pinMode(DT,INPUT);
  pinMode(SW,INPUT);
  Serial.begin(9600);

  lastState = digitalRead(CLK);
 }

void loop() {
  state = digitalRead(CLK);
  if(state != lastState)
  {
    if(digitalRead(DT) != state)
    {
      counter++;
      }
      else
      {
        counter--;
        }
          lcd.clear();
          lcd.setCursor(0,1);
          lcd.print("Pozice: ");
          lcd.print(counter);
          Serial.print(counter);
          Serial.println();
    if(counter<0){
     counter=5;}
    if(counter>=6){
     counter=0;}
    if(counter==0 or counter==1){
      lcd.clear();
      lcd.setCursor(2,0);
      lcd.print("Zvolte napoj");
      lcd.setCursor(5,1);
      lcd.print("Jahoda");}
    if(counter==2 or counter==3){
      lcd.clear();
      lcd.setCursor(2,0);
      lcd.print("Zvolte napoj");
      lcd.setCursor(5,1);
      lcd.print("Malina");}
    if(counter==4 or counter==5){
      lcd.clear();
      lcd.setCursor(2,0);
      lcd.print("Zvolte napoj");
      lcd.setCursor(4,1);
      lcd.print("Boruvka");}

  }

   if(digitalRead(SW) != 1)
  {
    volba++;
    counter=0;
    }

    lastState= state;

  }

   if(volba==1 and counter==0 or volba==1 and counter==1)
   {
    lcd.clear();
    lcd.setCursor(4,0)
    lcd.print("Zvolte silu");
    lcd.setCursor(1,5)
    lcd.print("-");
   }