#include <LiquidCrystal_I2C.h>
#include <Bounce2.h>

#define I2C_ADDR  0x27
#define LCD_COLUMNS 16
#define LCD_LINES 2


LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

#define PIN_MODE INPUT_PULLUP
#define INTERVAL_IN_MS 10

Bounce2::Button b1 = Bounce2::Button();
Bounce2::Button b2 = Bounce2::Button();

int z = 0;
int pos = 0;
unsigned long last = millis();

void setup() {
  lcd.init();
  lcd.backlight();

  b1.attach (7, PIN_MODE);
  b1.interval (INTERVAL_IN_MS);
  b1.setPressedState (LOW);


  b2.attach (6, PIN_MODE);
  b2.interval (INTERVAL_IN_MS);
  b2.setPressedState (LOW);

  lcd.clear();
}

void loop() {

  b1.update();
  b2.update();

  if (z == 0) //im Zustand 0
  {
    if (b2.pressed()) // Falls Down gedrückt wurde
    {
      z = 1;
    }
  } else if(z == 1)
  {
    if (millis() - last > 500)
    {
      pos++;
      last = millis();
    }
    if(pos == 16)
    {
      z = 2;
    }
    if (b1.pressed())
    {
      z = 4;
    }
  }
  else if (z == 3)
  {
    if (millis() - last > 500)
    {
      pos--;
      last = millis();
    }
    if(pos == 0)
    {
      z = 0;
    }
    if (b2.pressed())
    {
      z = 4;
    }
  }
  else if (z == 2)
  {
    if (b1.pressed())
    {
      z = 3;
    }
  }
  else if (z == 4)
  {
    if (b1.pressed())
    {
      z = 3;
    }
    if (b2.pressed())
    {
      z = 1;
    }
  }

  lcd.setCursor(0,0);
  lcd.print(z);

  lcd.setCursor(0,1);
  lcd.print(pos);
  lcd.print(" "); 

}