// ---------------------------------------------------------
// I2C - LCD Anzeige
// Pinning: ESP32 D22 <=> SCL I2C_LCD
//                D21 <=> SDA
//                3V3 <=> Vcc
//                GND <=> GND
// Befehle:
// oLCD.init ()
// oLCD.backlight ();
// oLCD.clear ();
// oLCD.setCursor (iSpalte,iZeile);
// oLCD.printf ("Hallo");
#include <LiquidCrystal_I2C.h>
#include <string.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 16
#define LCD_LINES   2
#define taster_up 3
#define taster_down 4
#define taster_left 5
#define taster_right 2

LiquidCrystal_I2C oLCD (I2C_ADDR, LCD_COLUMNS, LCD_LINES);

char sText[20];
// ---------------------------------------------------------

void PrintChar(int iSpalte, int iZeile, char cZeichen)
{
  char sString[2];

  sString[0]=cZeichen;
  sString[1]='\0';

  oLCD.setCursor(iSpalte, iZeile);
  oLCD.print(sString);
}


void()

void setup()
{
  oLCD.init();
  oLCD.backlight();  
  pinMode(taster_up, INPUT_PULLUP)
  pinMode(taster_down, INPUT_PULLUP)
  pinMode(taster_left, INPUT_PULLUP)
  pinMode(taster_right, INPUT_PULLUP)
}

void loop() 
{
  oLCD.clear();

  PrintChar(2,0,'x');
  PrintChar(6,1,'y');

  for(;;);
}