//code by cefuve.com

#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

const int PinCLK = 2;
const int PinDT = 3; 
const int PinSW = 4; 
int sayac = 0;
int durum;
int sondurum;

byte oben[8] = {
   B00100,
   B01110,
   B10101,
   B00100,
   B00100,
   B00100,
   B00000,
   B00000
};

byte unten[8] = {
   B00000,
   B00000,
   B00100,
   B00100,
   B00100,
   B10101,
   B01110,
   B00100
};


int state_clk_old; 
int state_btn_old;
int count;

LiquidCrystal_I2C lcd(0x27, 20, 4);


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

   pinMode(PinCLK,INPUT);
   pinMode(PinDT,INPUT);  
   pinMode(PinSW,INPUT);
  
    state_clk_old= digitalRead(PinCLK);
anaMenu();
}

void loop() {
  int state_btn = digitalRead(PinSW);

  int state_clk = digitalRead(PinCLK);
  int state_dt = digitalRead(PinDT);


  if(state_clk_old == HIGH && state_clk == LOW)
  {
    if(state_dt == LOW){
      count--;
    }else{
      count++;
    }
    if(count <= 0)
    {
      count =0;
    }
    if(count >= 5)
    {
      count = 5;
    }
    lcd.clear();
    anaMenu();
  }

  delay(5);
  state_clk_old = state_clk;

 if(state_btn_old == HIGH && state_btn == LOW){
  Serial.println("hallo");
 }
 state_btn_old = state_btn;

}



void anaMenu(){
  switch(count){
    case 0:
    lcd.setCursor(0,0);
    lcd.print("        MENU        ");
    lcd.setCursor(0,1);
    lcd.print("-->Menu1            ");
    lcd.setCursor(0,2);
    lcd.print("   Menu2            ");
    lcd.setCursor(0,3);
    lcd.print("   Menu3            ");
    break;

    case 1:
    lcd.setCursor(0,0);
    lcd.print("        MENU        ");
    lcd.setCursor(0,1);
    lcd.print("   Menu1            ");
    lcd.setCursor(0,2);
    lcd.print("-->Menu2            ");
    lcd.setCursor(0,3);
    lcd.print("   Menu3            ");
    break;

    case 2:
    lcd.setCursor(0,0);
    lcd.print("        MENU        ");
    lcd.setCursor(0,1);
    lcd.print("   Menu1            ");
    lcd.setCursor(0,2);
    lcd.print("   Menu2            ");
    lcd.setCursor(0,3);
    lcd.print("-->Menu3            ");
    lcd.createChar(0, unten); //das Byte-Array in den LCD-Speicher 0 schreiben
    lcd.setCursor(19, 3);
    lcd.write( (uint8_t) 0 ); // Byte-Array von LCD-Speicherplatz 0 ausgeben
    break;

    case 3:
    lcd.setCursor(0,0);
    lcd.print("        MENU        ");
    lcd.setCursor(0,1);
    lcd.print("-->Menu4            ");
    lcd.setCursor(0,2);
    lcd.print("   Menu5            ");
    lcd.setCursor(0,3);
    lcd.print("   Menu6            ");
    lcd.createChar(0, oben); //das Byte-Array in den LCD-Speicher 0 schreiben
    lcd.setCursor(19, 0);
    lcd.write( (uint8_t) 0 ); // Byte-Array von LCD-Speicherplatz 0 ausgeben
    break;

    case 4:
    lcd.setCursor(0,0);
    lcd.print("        MENU        ");
    lcd.setCursor(0,1);
    lcd.print("   Menu4            ");
    lcd.setCursor(0,2);
    lcd.print("-->Menu5            ");
    lcd.setCursor(0,3);
    lcd.print("   Menu6            ");
    break;

    case 5:
    lcd.setCursor(0,0);
    lcd.print("        MENU        ");
    lcd.setCursor(0,1);
    lcd.print("   Menu4            ");
    lcd.setCursor(0,2);
    lcd.print("   Menu5            ");
    lcd.setCursor(0,3);
    lcd.print("-->Menu6            ");
    break;
  }
}