The Matrix Falling Code, Arduino LOL Shield Style

I got an Arduino over the weekend. I also picked up a LOL Shield from JimmiePRodgers.com. After what seemed like an eternity soldering LEDs, I finally got a chance to try out some code. There is nothing earth shattering here, just a fun little demo. Enjoy!

My code is below:

----------------------------------------------------

// Matrix Falling Code LOL Shield Demo
// Code from Marshal Graham via marshalgraham.com 
// August 29, 2011 - First revision
// This runs on the Arduino with the LOL Shield from JimmiePRodgers.com
/*
  This is free software; you can redistribute it and/or
  modify it under the terms of the GNU Version 3 General Public
  License as published by the Free Software Foundation;
  or (at your option) any later version.

  This code is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

#include <Charliplexing.h> //Imports the library, which needs to be

// array to store the LED column state
boolean ledState[14];

void setup() 
{
  // Initialize the LOL Shield
  LedSign::Init();
  // seed the random number generator
  randomSeed(analogRead(0));
}

void loop()
{
  // Randomly choose a column
  DropColumn(random(14));
  // Wait a random amount of time up to 50 ms
  delay(random(50));
}

void DropColumn(int col)
{
  // Check the LED column state
  // If it's not lit then light it
  if (ledState[col] == false) {
    // cycle through each LED in the column
    for (byte i=0; i<9; i++){
      LedSign::Set(col,i,1);
      delay(25);
      }
    ledState[col]=true;
  }
  // otherwise shut it off
  else {
    // cycle through each LED in the column
    for (byte i=0; i<9; i++){
      LedSign::Set(col,i,0);
      delay(25);
      }
      ledState[col]=false;
  }
}