DOT MATRIK HEART ARDUINO UNO

     // 2-dimensional array of row pin numbers:
const int row[8] = {2, 7, 19, 5, 13, 18, 12, 16};

// 2-dimensional array of column pin numbers:
const int col[8] = {  6, 11, 10, 3, 17, 4, 8, 9};

// 2-dimensional array of pixels:
int pixels[8][8];

int count = 1000;

char str[] = "FABCDEDCBA";
int strLen = sizeof(str);
int ptrChar = 0;


typedef bool charMapType[8][8];

const charMapType charBlank = {
  {0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 1, 1, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0}
};

const charMapType heart0 = {
  {0, 0, 0, 0, 0, 0, 0, 0},
  {0, 1, 1, 1, 1, 0, 0, 0},
  {0, 1, 0, 0, 0, 0, 0, 0},
  {0, 1, 1, 1, 1, 0, 0, 0},
  {0, 1, 1, 1, 1, 0, 0, 0},
  {0, 0, 0, 0, 1, 0, 0, 0},
  {0, 1, 1, 1, 1, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0}
};

const charMapType heart1 = {
  {0, 0, 0, 0, 0, 0, 0, 0},
  {0, 1, 1, 0, 1, 1, 0, 0},
  {0, 1, 0, 1, 0, 1, 0, 0},
  {0, 1, 0, 1, 0, 1, 0, 0},
  {0, 1, 0, 1, 0, 1, 0, 0},
  {0, 1, 0, 0, 0, 1, 0, 0},
  {0, 1, 0, 0, 0, 1, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0}
};

const charMapType heart2 = {
  {0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 1, 0, 0, 0, 1, 0},
  {0, 0, 1, 0, 0, 1, 0, 0},
  {0, 0, 1, 1, 1, 0, 0, 0},
  {0, 0, 1, 1, 1, 0, 0, 0},
  {0, 0, 1, 0, 0, 1, 0, 0},
  {0, 0, 1, 0, 0, 0, 1, 0},
  {0, 0, 0, 0, 0, 0, 0, 0}
};

const charMapType heart3 = {
  {1, 0, 1, 0, 1, 1, 1, 0},
  {1, 1, 1, 0, 1, 0, 0, 0},
  {1, 0, 1, 0, 1, 1, 0, 0},
  {1, 0, 1, 0, 1, 0, 0, 0},
  {1, 0, 1, 0, 1, 1, 1, 0},
  {0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0}
};

const charMapType heart4 = {
  {0, 1, 1, 0, 0, 1, 1, 0},
  {1, 1, 1, 1, 1, 1, 1, 1},
  {1, 1, 1, 1, 1, 1, 1, 1},
  {0, 1, 1, 1, 1, 1, 1, 0},
  {0, 0, 1, 1, 1, 1, 0, 0},
  {0, 0, 0, 1, 1, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0}
};

const charMapType *charMap[6] = {&heart0, &heart1, &heart2, &heart3, &heart4, &charBlank};

void setup() {
  // initialize the I/O pins as outputs
  // iterate over the pins:
  for (int thisPin = 0; thisPin < 8; thisPin++) {
    // initialize the output pins:
    pinMode(col[thisPin], OUTPUT);
    pinMode(row[thisPin], OUTPUT);
    // take the col pins (i.e. the cathodes) high to ensure that
    // the LEDS are off:
    digitalWrite(col[thisPin], HIGH);
  }

  //setupScreen();
  setupChar();

}

void loop() {

  // draw the screen:
  refreshScreen();
 
  if(count-- == 0){count = 1000;
    setupChar();
  }

}

void setupChar(){
  char c = str[ptrChar];
  int offset = c - 'A';
 
  const charMapType *cMap = charMap[offset];
  //charMapType *cMap = &charDummy;
 
  for (int x = 0; x < 8; x++) {
    for (int y = 0; y < 8; y++) {
      bool v = (*cMap)[x][y];
     
      if(v){
        pixels[x][y] = LOW;
      }else{
        pixels[x][y] = HIGH;
      }
    }
  }
 
  ptrChar++;
  if(ptrChar>=strLen-1){
    ptrChar = 0;
  }

}

void refreshScreen() {
  // iterate over the rows (anodes):
  for (int thisRow = 0; thisRow < 8; thisRow++) {
    // take the row pin (anode) high:
    digitalWrite(row[thisRow], HIGH);
    // iterate over the cols (cathodes):
    for (int thisCol = 0; thisCol < 8; thisCol++) {
      // get the state of the current pixel;
      int thisPixel = pixels[thisRow][thisCol];
      // when the row is HIGH and the col is LOW,
      // the LED where they meet turns on:
      digitalWrite(col[thisCol], thisPixel);
      // turn the pixel off:
      if (thisPixel == LOW) {
        digitalWrite(col[thisCol], HIGH);
      }
    }
    // take the row pin low to turn off the whole row:
    digitalWrite(row[thisRow], LOW);
  }
}