// ---------------------------------------------------------
// 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>

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

LiquidCrystal_I2C oLCD (I2C_ADDR, LCD_COLUMNS, LCD_LINES);
// ---------------------------------------------------------
#define PIN_UP    33
#define PIN_DOWN  14
#define PIN_RIGHT 32
#define PIN_LEFT  27

char sText [30];

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

  pinMode(PIN_UP, INPUT_PULLUP);
  pinMode(PIN_DOWN, INPUT_PULLUP);
  pinMode(PIN_LEFT, INPUT_PULLUP);
  pinMode(PIN_RIGHT, INPUT_PULLUP); 
}

void loop() 
{
  int iZeile;
  int iSpalte;

  iZeile=0;
  iSpalte=5;
  strcpy (sText,"Test");
 
  for (;;)
  {
    if (digitalRead(PIN_UP)==LOW) iZeile=0;
    if (digitalRead(PIN_DOWN)==LOW) iZeile=1;
    
    if (digitalRead(PIN_LEFT)==LOW) iSpalte--;
    if (digitalRead(PIN_RIGHT)==LOW) iSpalte++;
    
    if (iSpalte<0) iSpalte=0;
    if (iSpalte>15) iSpalte=15;

    oLCD.clear();
    oLCD.setCursor (iSpalte,iZeile);
    oLCD.print (sText);

    delay (500);   
  }
 
}