// Manual multiplexing of 4x4 LEDs using Arduino UNO
// The potentiometer sets the delay between setting the individual LEDs
/*
const int row0 = 6, row1 = 7, row2 = 8, row3 = 9, row4 = 10, row5 = 11, row6 = 12, row7 = 13;
const int col0 = 18, col1 = 17, col2 = 16, col3 = 15, col4 = 2, col5 = 3, col6 = 4, col7 = 5;
*/
const int rows[8] = {6, 7, 8, 9, 10, 11, 12, 13};
const int cols[8] = {18, 17, 16, 15, 2, 3, 4, 5};

void setup() {
  // set the pins to output
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);  
  pinMode(4, OUTPUT);    
  pinMode(5, OUTPUT);    
  pinMode(6, OUTPUT);    
  pinMode(7, OUTPUT);      
  pinMode(8, OUTPUT);    
  pinMode(9, OUTPUT);      
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(12, OUTPUT);  
  pinMode(13, OUTPUT);    
  pinMode(15, OUTPUT);    
  pinMode(16, OUTPUT);    
  pinMode(17, OUTPUT);      
  pinMode(18, OUTPUT);

  // set potentimeter pin to input
  pinMode(A0, INPUT);
}


void loop() {
  int count = sizeof(cols)/sizeof(cols[0]);
  int delay_time = map(analogRead(A0), 0, 1023, 1, 500); // set the delay time based on the potentiometer value

  // Egle
  int egle = 500;
  while (egle > 0)
  {
    // 0;1 : 3;4;7
    for (int i = 0; i < count; i++)
    {
      if (i != 3 && i != 4)
      {
        digitalWrite(cols[i], LOW);
      }
      else
      {
        digitalWrite(cols[i], HIGH);
      }
    }

    digitalWrite(rows[0], LOW);
    digitalWrite(rows[1], LOW);

    for (int i = 2; i < count; i++)
    {
      digitalWrite(rows[i], HIGH);
    }

    digitalWrite(rows[7], LOW);
    delay(delay_time);

    // 2-3:2-5
    for (int i = 0; i < count; i++)
    {
      if (i < 2 || i > 5)
      {
        digitalWrite(cols[i], LOW);
      }
      else
      {
        digitalWrite(cols[i], HIGH);
      }
    }

    for (int i = 0; i < count; i++)
    {
      if (i != 2 && i != 3)
      {
        digitalWrite(rows[i], HIGH);
      }
      else
      {
        digitalWrite(rows[i], LOW);
      }
    }

    delay(delay_time);

    // 4:1-6
    for (int i = 0; i < count; i++)
    {
      if (i < 2 || i > 5)
      {
        digitalWrite(cols[i], LOW);
      }
      else
      {
        digitalWrite(cols[i], HIGH);
      }
    }

    for (int i = 0; i < count; i++)
    {
      if (i != 4)
      {
        digitalWrite(rows[i], HIGH);
      }
      else
      {
        digitalWrite(rows[i], LOW);
      }
    }

    delay(delay_time);

    // 5-6:all
    for (int i = 0; i < count; i++)
    {
      digitalWrite(cols[i], HIGH);
    }

    for (int i = 0; i < count; i++)
    {
      if (i != 5 && i != 6)
      {
        digitalWrite(rows[i], HIGH);
      }
      else
      {
        digitalWrite(rows[i], LOW);
      }
    }

    delay(delay_time);
    egle -= 1;
  }

  // Sniegpārsliņa
  int sniegp = 500;
  while (sniegp > 0)
  {
    // 0-2; 4-6 : 3
    for (int i = 0; i < count; i++)
    {
      if (i != 3)
      {
        digitalWrite(cols[i], LOW);
      }
      else
      {
        digitalWrite(cols[i], HIGH);
      }
    }

    for (int i = 0; i < count; i++)
    {
      if (i != 3 && i != 7)
      {
        digitalWrite(rows[i], LOW);
      }
      else
      {
        digitalWrite(rows[i], HIGH);
      }
    }

    delay(delay_time);

    // 1;5:1;5
    for (int i = 0; i < count; i++)
    {
      if (i != 1 && i != 5)
      {
        digitalWrite(cols[i], LOW);
        digitalWrite(rows[i], HIGH);
      }
      else
      {
        digitalWrite(cols[i], HIGH);
        digitalWrite(rows[i], LOW);
      }
    }

    delay(delay_time);

    // 2;4:2-4
    for (int i = 0; i < count; i++)
    {
      if (i < 2 || i > 4)
      {
        digitalWrite(cols[i], LOW);
      }
      else
      {
        digitalWrite(cols[i], HIGH);
      }
    }

    for (int i = 0; i < count; i++)
    {
      if (i != 2 && i != 4)
      {
        digitalWrite(rows[i], HIGH);
      }
      else
      {
        digitalWrite(rows[i], LOW);
      }
    }

    delay(delay_time);

    // 3 : 0-2;4-6
    for (int i = 0; i < count; i++)
    {
      if (i != 3 && i != 7)
      {
        digitalWrite(cols[i], HIGH);
      }
      else
      {
        digitalWrite(cols[i], LOW);
      }
    }

    for (int i = 0; i < count; i++)
    {
      if (i != 3)
      {
        digitalWrite(rows[i], HIGH);
      }
      else
      {
        digitalWrite(rows[i], LOW);
      }
    }

    delay(delay_time);
    
    sniegp -= 1;
  }

  // Dāvana
  int davana = 500;
  while (davana > 0)
  {
    // 0:2;5
    for (int i = 0; i < count; i++)
    {
      if (i != 2 && i != 5)
      {
        digitalWrite(cols[i], LOW);
      }
      else
      {
        digitalWrite(cols[i], HIGH);
      }
    }

    digitalWrite(rows[0], LOW);

    for (int i = 1; i < count; i++)
    {
      digitalWrite(rows[i], HIGH);
    }

    delay(delay_time);
    
    // 1-2:1;3-4;6
    digitalWrite(cols[0], LOW);
    for (int i = 1; i < count; i++)
    {
      if (i != 2 && i != 5 && i != 7)
      {
        digitalWrite(cols[i], HIGH);
      }
      else
      {
        digitalWrite(cols[i], LOW);
      }
    }

    digitalWrite(rows[0], HIGH);
    digitalWrite(rows[1], LOW);
    digitalWrite(rows[2], LOW);

    for (int i = 3; i < count; i++)
    {
      digitalWrite(rows[i], HIGH);
    }

    delay(delay_time);

    // 2-6:0-7
    for (int i = 0; i < count; i++)
    {
      digitalWrite(cols[i], HIGH);
    }
    
    digitalWrite(rows[0], HIGH);
    digitalWrite(rows[1], HIGH);
    digitalWrite(rows[2], HIGH);

    for (int i = 3; i < count; i++)
    {
      digitalWrite(rows[i], LOW);
    }

    delay(delay_time);

    davana -= 1;
  }
}