#include <LiquidCrystal_I2C.h>

//----------LCD-MENÜ----------------------------
LiquidCrystal_I2C lcd(0x27,20,4);
#define Drinks 1
#define Settings 2
#define Drink1  3
#define Drink2  4
#define Drink3  5
#define Drink4  6
#define Drink5  7
#define Drink6  8
#define Drink7  9
#define Drink8  10
#define Zurueck 11
#define Kuehlung 12
#define Reset   13
#define Spuelen  14

char buf[16];
char buf2[16];

uint8_t Down;
uint8_t Up;
uint8_t Enter;
uint8_t displaycase=1;
uint32_t Zeit_LCD;
uint32_t Zeit_Taster;
void setup()
{
  lcd.init();
  lcd.backlight();
}

void taster()
{
   if (digitalRead(Down)== LOW)
       displaycase=Down  ;

   if (digitalRead(Up)== LOW)
       displaycase=Up  ;

   if (digitalRead(Enter)== LOW)
       displaycase=Enter  ;
  }


void displayvoid()
{
 switch(displaycase){
//--------Hauptmenü---------
  case Drinks:
                Down=Settings;
                Enter=Drink1;
                sprintf(buf,">Drinks         ");
               sprintf(buf2," Settings       "); break;

  case Settings:
                Up=Drinks;
                Enter=Kuehlung;
                sprintf(buf," Drinks         ");
               sprintf(buf2,">Settings       "); break;

//-------------settings-menü-----------
  case Kuehlung:
                Down=Spuelen;
                sprintf(buf,">Kuehlung       ");
               sprintf(buf2," Spuelen        "); break;

  case Spuelen:
                Up=Kuehlung;
                sprintf(buf,">Spuelen        ");
               sprintf(buf2,"                "); break;


//----------Drink-MENÜ--------------
  case Drink1:
                Down=Drink2;
                sprintf(buf,">Drink1         ");
               sprintf(buf2," Drink2      "); break;


  case Drink2:
                Up=Drink1;
                Down=Drink3;
                sprintf(buf," Drink1         ");
               sprintf(buf2,">Drink2         "); break;

  case Drink3:
                Up=Drink2;
                Down=Drink4;
                sprintf(buf,">Drink1         ");
               sprintf(buf2," Drink1         "); break;

  case Drink4:
                Up=Drink3;
                Down=Drink5;
                sprintf(buf," Drink1         ");
               sprintf(buf2,">Drink1         "); break;

  case Drink5:
                Up=Drink4;
                Down=Drink6;
                sprintf(buf,">Drink1         ");
               sprintf(buf2," Drink1         "); break;

  case Drink6:
                Up=Drink5;
                Down=Drink7;
                sprintf(buf," Drink1         ");
               sprintf(buf2,">Drink1         "); break;

  case Drink7:
                Up=Drink6;
                Down=Drink8;
                sprintf(buf,">Drink1         ");
               sprintf(buf2," Drink1         "); break;

  case Drink8:
                Up=Drink7;
                Down=Drink1;
                sprintf(buf," Drink1         ");
               sprintf(buf2,">Drink1         "); break;

  case Zurueck:
                Up=Drink8;
                Enter=Drinks;
                sprintf(buf,"Zurueck         ");
               sprintf(buf2,"                "); break;
                }
lcd.setCursor(0,0);lcd.print(buf); memset(buf, 0,16);
lcd.setCursor(0,1);lcd.print(buf2); memset(buf2, 0,16);
           }
  void loop ()
 {
if(((uint32_t) millis()-Zeit_Taster)> 200) {Down();}
if(((uint32_t) millis()-Zeit_Taster)> 200) {Up();}
if(((uint32_t) millis()-Zeit_Taster)> 200) {Enter();}

if(((uint32_t) millis()-Zeit_LCD)> 300) {Displayvoid();}
 }