//http://embed.plnkr.co/3VUsekP3jC5xwSIQDVHx/preview

#define ROW_1 2 //name the ports the jumper wires belong to
#define ROW_2 3
#define ROW_3 4
#define ROW_4 5
#define ROW_5 6
#define ROW_6 7
#define ROW_7 8
#define ROW_8 9

#define COL_1 10
#define COL_2 11
#define COL_3 12
#define COL_4 13
#define COL_5 A0
#define COL_6 A1
#define COL_7 A2
#define COL_8 A3

const byte rows[] = {
    ROW_1, ROW_2, ROW_3, ROW_4, ROW_5, ROW_6, ROW_7, ROW_8 //how to read the leds
};

byte ALL[] = {B11111111,B11111111,B11111111,B11111111,B11111111,B11111111,B11111111,B11111111}; //if blocks are put under each other, it shows the letter
byte EX[] = {B00000000,B00001000,B00001000,B00001000,B00001000,B00000000,B00001000,B00000000};
byte A[] = {B00000000,B00011000,B00100100,B00100100,B00111100,B00100100,B00100100,B00000000};
byte B[] = {B01111000,B01001000,B01001000,B01110000,B01001000,B01000100,B01000100,B01111100};
byte C[] = {B00000000,B00011110,B00100000,B01000000,B01000000,B01000000,B00100000,B00011110};
byte D[] = {B00000000,B00111000,B00100100,B00100010,B00100010,B00100100,B00111000,B00000000};
byte E[] = {B00000000,B00111100,B00100000,B00111000,B00100000,B00100000,B00111100,B00000000};
byte F[] = {B00000000,B00111100,B00100000,B00111000,B00100000,B00100000,B00100000,B00000000};
byte G[] = {B00000000,B00111110,B00100000,B00100000,B00101110,B00100010,B00111110,B00000000};
byte H[] = {B00000000,B00100100,B00100100,B00111100,B00100100,B00100100,B00100100,B00000000};
byte I[] = {B00000000,B00011100,B00001000,B00001000,B00001000,B00001000,B00011100,B00000000};
byte J[] = {B00000000,B00011100,B00001000,B00001000,B00001000,B00101000,B00111000,B00000000};
byte K[] = {B00000000,B00100100,B00101000,B00110000,B00101000,B00100100,B00100100,B00000000};
byte L[] = {B00000000,B00100000,B00100000,B00100000,B00100000,B00100000,B00111100,B00000000};
byte M[] = {B00000000,B00000000,B01000100,B10101010,B10010010,B10000010,B10000010,B00000000};
byte N[] = {B00000000,B00100010,B00110010,B00101010,B00100110,B00100010,B00000000,B00000000};
byte O[] = {B00000000,B00111100,B01000010,B01000010,B01000010,B01000010,B00111100,B00000000};
byte P[] = {B00000000,B00111000,B00100100,B00100100,B00111000,B00100000,B00100000,B00000000};
byte Q[] = {B00000000,B00111100,B01000010,B01000010,B01000010,B01000110,B00111110,B00000001};
byte R[] = {B00000000,B00111000,B00100100,B00100100,B00111000,B00100100,B00100100,B00000000};
byte S[] = {B00000000,B00111100,B00100000,B00111100,B00000100,B00000100,B00111100,B00000000};
byte T[] = {B00000000,B01111100,B00010000,B00010000,B00010000,B00010000,B00010000,B00000000};
byte U[] = {B00000000,B01000010,B01000010,B01000010,B01000010,B00100100,B00011000,B00000000};
byte V[] = {B00000000,B00100010,B00100010,B00100010,B00010100,B00010100,B00001000,B00000000};
byte W[] = {B00000000,B10000010,B10010010,B01010100,B01010100,B00101000,B00000000,B00000000};
byte X[] = {B00000000,B01000010,B00100100,B00011000,B00011000,B00100100,B01000010,B00000000};
byte Y[] = {B00000000,B01000100,B00101000,B00010000,B00010000,B00010000,B00010000,B00000000};
byte Z[] = {B00000000,B00111100,B00000100,B00001000,B00010000,B00100000,B00111100,B00000000};

int timeCount = 0; //stars counting from 0

void setup() {
    Serial.begin(9600); // Open serial port
    
    for (int i = 2; i <= 13; i++) //smart one, instead of listing all the used ports, put in into cycle :D
    pinMode(i, OUTPUT);
    pinMode(A0, OUTPUT);
    pinMode(A1, OUTPUT);
    pinMode(A2, OUTPUT);
    pinMode(A3, OUTPUT);
}

void loop() 
{
delay(10); //0 makes it brighter, higher value makes it vibrating
timeCount++;

  if(timeCount <  25) {
    drawScreen(S);
  }
  else if (timeCount <  50) {
    drawScreen(Z);
  }
  else if (timeCount <  75) {
    drawScreen(E);
  }
  else if (timeCount <  100) {
    drawScreen(R);
  }
  else if (timeCount <  125) {
    drawScreen(E);
  }
  else if (timeCount <  150) {
    drawScreen(T);
  }
  else if (timeCount <  175) {
    drawScreen(L);
  }
  else if (timeCount <  200) {
    drawScreen(E);
  }
  else if (timeCount <  225) {
    drawScreen(K);
  }
  else if (timeCount <  350) {
    drawScreen(EX);
  }
  else {
    timeCount = 0;
  }

//drawScreen(ALL); turn on all the leds to check if everything works fine
}

void  drawScreen(byte letter[]){
     
  for (int i = 0; i < 8; i++) {
      setColumns(letter[i]); 
      digitalWrite(rows[i], HIGH);
      delay(2); // Set this to 50 or 100 if you want to see the multiplexing effect!
      digitalWrite(rows[i], LOW);
  }
}
void setColumns(byte b) {
    digitalWrite(COL_1, (~b >> 0) & 0x01); // Get the 1st bit: 10000000
    digitalWrite(COL_2, (~b >> 1) & 0x01); // Get the 2nd bit: 01000000
    digitalWrite(COL_3, (~b >> 2) & 0x01); // Get the 3rd bit: 00100000
    digitalWrite(COL_4, (~b >> 3) & 0x01); // Get the 4th bit: 00010000
    digitalWrite(COL_5, (~b >> 4) & 0x01); // Get the 5th bit: 00001000
    digitalWrite(COL_6, (~b >> 5) & 0x01); // Get the 6th bit: 00000100
    digitalWrite(COL_7, (~b >> 6) & 0x01); // Get the 7th bit: 00000010
    digitalWrite(COL_8, (~b >> 7) & 0x01); // Get the 8th bit: 00000001
    
    // If the polarity of your matrix is the opposite of mine
    // remove all the '~' above.
}