// ---------------------------------------------------------
//Definiton of LCD
//----------------------------------------------------------
#include <LiquidCrystal_I2C.h>

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

LiquidCrystal_I2C oLCD (I2C_ADDR, LCD_COLUMNS, LCD_LINES);
// ---------------------------------------------------------
//Definition of Buttons
// ---------------------------------------------------------

#define ButtonUP 15
#define ButtonDOWN 4
#define ButtonLEFT 2
#define ButtonRIGHT 5


void setup()
{
  oLCD.init();
  oLCD.backlight();  
  delay(700);

  pinMode(ButtonUP, INPUT_PULLUP);
  pinMode(ButtonDOWN, INPUT_PULLUP);
  pinMode(ButtonLEFT, INPUT_PULLUP);
  pinMode(ButtonRIGHT, INPUT_PULLUP);
}

int Inputprocessing(int iUp, int iDown, int iLeft, int iRight)
{
  // ---------------------------------------------------------
  //        1
  //      4 o 2       Output number dependant on Button presed
  //        3
  // ---------------------------------------------------------
int iRueckgabe;

iRueckgabe = (iUp==0?1:0);
iRueckgabe = (iDown==0?3:0);
iRueckgabe = (iLeft==0?4:0);
iRueckgabe = (iRight==0?2:0);

if(iRueckgabe == 0)
{
Serial.begin(115200);
Serial.println("Error in Input processing!");
}
return iRueckgabe;
}

void loop()
{

}