const byte zeile[] = {4, 5, 6, 7, 8};
const byte spalte[] = {9, 10, 11, 12, 13};

unsigned long LastAction = 0;
unsigned long CurrentTime = 0;

const byte charTable[][30] = {
  {0b01100, 0b10010, 0b11110, 0b10010, 0b10010},          //A
  {0b11100, 0b10010, 0b11110, 0b10010, 0b11100},          //B
  {0b01110, 0b10000, 0b10000, 0b10000, 0b01110},          //C
  {0b11100, 0b10010, 0b10010, 0b10010, 0b11100},          //D
  {0b11110, 0b10000, 0b11100, 0b10000, 0b11110},          //E
  {0b11110, 0b10000, 0b11100, 0b10000, 0b10000},          //F
  {0b01110, 0b10000, 0b10110, 0b10010, 0b11110},          //G
  {0b10010, 0b10010, 0b11110, 0b10010, 0b10010},          //H
  {0b00100, 0b00100, 0b00100, 0b00100, 0b00100},          //I
  {0b00100, 0b00100, 0b00100, 0b10100, 0b11100},          //J
  {0b10010, 0b10100, 0b11000, 0b10100, 0b10010},          //K
  {0b10000, 0b10000, 0b10000, 0b10000, 0b11110},          //L
  {0b10001, 0b11011, 0b10101, 0b10001, 0b10001},          //M
  {0b10010, 0b11010, 0b10110, 0b10010, 0b10010},          //N
  {0b01100, 0b10010, 0b10010, 0b10010, 0b01100},          //O
  {0b11100, 0b10010, 0b10010, 0b11100, 0b10000},          //P
  {0b01110, 0b10001, 0b10101, 0b10010, 0b01101},          //Q
  {0b11100, 0b10010, 0b11100, 0b10010, 0b10010},          //R
  {0b11110, 0b10000, 0b11110, 0b00010, 0b11110},          //S
  {0b11111, 0b00100, 0b00100, 0b00100, 0b00100},          //T
  {0b10010, 0b10010, 0b10010, 0b10010, 0b01100},          //U
  {0b10001, 0b10001, 0b10001, 0b01010, 0b00100},          //V
  {0b10001, 0b10001, 0b10101, 0b10101, 0b01110},          //W
  {0b10010, 0b10010, 0b01100, 0b10010, 0b10010},          //X
  {0b10001, 0b10001, 0b01110, 0b00100, 0b00100},          //Y
  {0b11110, 0b00010, 0b00100, 0b01000, 0b11110},          //Z
  {0b00000, 0b00000, 0b00000, 0b00000, 0b00000},          //EX
  {0b11111, 0b11111, 0b11111, 0b11111, 0b11111},          //ALL
  {0b01010, 0b00000, 0b00100, 0b10001, 0b01110},          //smile
  {0b10001, 0b00100, 0b00000, 0b01110, 0b10001},          //frown
};

const byte firstChar = 'A';                            // mit welchem Zeichen beginnt der charTable

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

  for (size_t i = 0; i < sizeof(zeile); i++) {       // aufpassen, das klappt erst nach umstellen der Variable zeile auf byte!
    pinMode(zeile[i], OUTPUT);
  }
  for (size_t i = 0; i < sizeof(spalte); i++) {
    pinMode(spalte[i], OUTPUT);
  }
}

void loop() {
  char myStr[] = "CD"; // Variable mit dem anzuzeigenden Text


  wort(myStr, sizeof(myStr) - 1);
}

void wort(char *toPrint, size_t len)
{
  CurrentTime = millis();

  for (size_t i = 0; i < len; i++)
  {

    // convert character to a variable
    byte myIndex = toPrint[i] - firstChar; // ASCII minus erstem Zeichen somit 0 für das erste Zeichen in deinem Char-Table

    if (CurrentTime - LastAction < 1000) {

      zeige(charTable[myIndex]);
      LastAction = CurrentTime;
    }

  }

  // evtl eine Zeitsteuerung, oder eine Verzögerung zwischen den Buchstaben
}



// ***** Ausgabe an die 5x5 LED MAtrix ******
void zeige(const byte buffer2[]) {
  for (int a = 0; a <= 4; a++) {
    digitalWrite(zeile[a], 1);
    for (int i = 0; i < 5; i++) {
      digitalWrite(spalte[i], bitRead (buffer2[a], i));
      digitalWrite(spalte[i], 0);
    }
    digitalWrite(zeile[a], 0);
  }
}