My code is below:
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// 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;
}
}