Numpad mit LCD-I2C 16x2 Display

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5 
// lib: https://github.com/Chris--A/Keypad
#include <Keypad.h>

const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns
//define the cymbols on the buttons of the keypads
char hexaKeys[ROWS][COLS] =
{
  {'0', '1', '2', '3'},
  {'4', '5', '6', '7'},
  {'8', '9', 'A', 'B'},
  {'C', 'D', 'E', 'F'}
};
byte rowPins[ROWS] = {3, 2, 1, 0}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {7, 6, 5, 4}; //connect to the column pinouts of the keypad

//initialize an instance of class NewKeypad
Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);

void setup()
{
  Serial.begin(9600);
}

void loop()
{
  char customKey = customKeypad.getKey();
  if (customKey)
  {
    Serial.println(customKey);
  }
  switch (customKey)
  {
    case '0':
      Serial.println(F("Hier geht es weiter...."));
      // Hier der Aufruf fürs LCD
      break;
    case '1':
      Serial.println(F("Letzter Eintrag...."));
      // Und hier auch der Aufruf fürs LCD
      break;
  }
}