const int rows[5] = { 2, 3, 4, 5, 6};
const int cols[5] = { 9, 10, 11, 12, 13};

const char pattern[5][5] =
{
  { '#',' ',' ',' ','#'},
  { ' ','#',' ','#',' '},
  { ' ',' ','#',' ',' '},
  { ' ','#',' ','#',' '},
  { '#',' ',' ',' ','#'},
};

void setup() 
{
  for( int i=0; i<5; i++)
  {
    pinMode(rows[i], OUTPUT);
    pinMode(cols[i], OUTPUT);
  }
}

void loop() 
{
  // Activate the rows one by one and set the columns
  for(int row=0; row<5; row++)
  {
    // activate this row.
    digitalWrite( rows[row], LOW);
    
    // Turn on the colums that need to be lit
    for( int col=0; col<5; col++)
    {
      if( pattern[row][col] == '#')
      {
        digitalWrite( cols[col], HIGH);
      }
    }

    // Wait, so the leds are visible
    delay(20);

    // Turn off the leds (I turn all of them off)
    for( int col=0; col<5; col++)
    {
      digitalWrite( cols[col], LOW);
    } 

    // Done with this row, de-activate it
    digitalWrite( rows[row], HIGH);
  }
}