#include <LCD_I2C.h>
LCD_I2C lcd(0x27,20,4);

// siehe: https://forum.arduino.cc/t/wie-bekommt-man-solch-grosse-zahlen-hin/986148/3


byte largeLetterPart0[8] = {
  B00000,
  B00000,
  B00000,
  B00000,
  B00001,
  B00111,
  B01111,
  B11111,
};

byte largeLetterPart1[8] = {
  B00000,
  B00000,
  B00000,
  B00000,
  B11111,
  B11111,
  B11111,
  B11111,
};

byte largeLetterPart2[8] = {
  B00000,
  B00000,
  B00000,
  B00000,
  B10000,
  B11100,
  B11110,
  B11111,
};

byte largeLetterPart3[8] = {
  B11111,
  B01111,
  B00111,
  B00001,
  B00000,
  B00000,
  B00000,
  B00000,
};


byte largeLetterPart4[8] = {
  B11111,
  B11111,
  B11111,
  B11111,
  B00000,
  B00000,
  B00000,
  B00000,
};

byte largeLetterPart5[8] = {
  B11111,
  B11110,
  B11100,
  B10000,
  B00000,
  B00000,
  B00000,
  B00000,
};

byte largeLetterPart6[8] = {
  B11111,
  B11111,
  B11111,
  B11111,
  B11111,
  B01111,
  B00111,
  B00001,
};

byte largeLetterPart7[8] = {
  B11111,
  B11111,
  B11111,
  B11111,
  B11111,
  B11110,
  B11100,
  B10000,
};


void writeLargeDigit0(byte column) {
  lcd.setCursor(column, 0);
  lcd.write(byte(0));
  lcd.write(byte(1));
  lcd.write(byte(2));
  lcd.setCursor(column, 1);
  lcd.write(B11111111);
  lcd.write(' ');
  lcd.write(B11111111);
  lcd.setCursor(column, 2);
  lcd.write(B11111111);
  lcd.write(' ');
  lcd.write(B11111111);
  lcd.setCursor(column, 3);
  lcd.write(byte(3));
  lcd.write(byte(4));
  lcd.write(byte(5));
};

void writeLargeDigit9(byte column) {
  lcd.setCursor(column, 0);
  lcd.write(byte(0));
  lcd.write(byte(1));
  lcd.write(byte(2));
  lcd.setCursor(column, 1);
  lcd.write(byte(6));
  lcd.write(byte(1));
  lcd.write(B11111111);
  lcd.setCursor(column, 2);
  lcd.write(' ');
  lcd.write(' ');
  lcd.write(B11111111);
  lcd.setCursor(column, 3);
  lcd.write(byte(3));
  lcd.write(byte(4));
  lcd.write(byte(5));
};

void setup() {
  lcd.begin();                      // initialize the lcd 
  lcd.backlight();
  lcd.createChar(0, largeLetterPart0);
  lcd.createChar(1, largeLetterPart1);
  lcd.createChar(2, largeLetterPart2);
  lcd.createChar(3, largeLetterPart3);
  lcd.createChar(4, largeLetterPart4);
  lcd.createChar(5, largeLetterPart5);
  lcd.createChar(6, largeLetterPart6);
  lcd.createChar(7, largeLetterPart7);

  lcd.print("Hallo");
  delay(2000);
  lcd.clear();

  writeLargeDigit9(0);
  writeLargeDigit0(4);
  writeLargeDigit0(8);
  writeLargeDigit9(12);
  writeLargeDigit9(16);
  
}

void loop() {
  

}