#define ROW_1 2
#define ROW_2 3
#define ROW_3 4
#define ROW_4 5
#define ROW_5 47
#define ROW_6 49
#define ROW_7 51
#define ROW_8 53

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

const int rows[] = {
    ROW_1, ROW_2, ROW_3, ROW_4, ROW_5, ROW_6, ROW_7, ROW_8
};
const int cols[] = {
  COL_1,COL_2, COL_3, COL_4, COL_5, COL_6, COL_7, COL_8
};


void setup() {
  for(int i =0; i < 8; i++){
    pinMode(rows[i], OUTPUT);
    pinMode(cols[i], OUTPUT);
  }
}


void loop() {
    // Turn all the LED on
//    for (byte i = 0; i < 8; i++)   
//    {
//        digitalWrite(rows[i], LOW); // set all cathode to LOW
//        digitalWrite(cols[i], HIGH); // set all anode to HIGH
//    }

    //--------------------------------------

    // Row 6, col 4

    for (int i = 0; i < 8; i++)      
    {
        digitalWrite(rows[i], HIGH); // Set all cathode to HIGH
        digitalWrite(cols[i], LOW); // Set all anode to LOW
    }
    
    digitalWrite(rows[5], LOW);
    digitalWrite(cols[3], HIGH);
    
    // ---------------------------------------
//    for (byte i = 0; i < 8; i++)      
//    {
//        digitalWrite(cols[i], HIGH); 
//        delay(1000);
//    }
//    
//    digitalWrite(cols[3], HIGH);
//    
//    for (byte i = 0; i < 8; i++)      
//    {
//        if (i>0)
//        {
//            digitalWrite(rows[i - 1], HIGH);
//        }
//        digitalWrite(rows[i], LOW);
//        delay(1000);
//    }

      // ---------------------------------------

      

    delay(20);
  
}