This is a code for a 3x3x3 LED cube. This cube is run off of 12 pins. To wire this cube, connect all
of the anodes on a given level and connect all of the cathodes down vertically in one column.







int anode [] ={5, 6, 7, 9, 10, 11, 12, 13, 8};     // sets an aray for lights to be used
int anode2 [] ={8, 13, 12, 11, 10, 9, 7, 6, 5};    // opposeite aray
int catone [] ={2, 2, 2, 2, 2, 2, 2, 2, 2};        // negative for bottom level
int cattwo  [] ={3, 3, 3, 3, 3, 3, 3, 3, 3};       // negative for middle level
int catthree [] ={4, 4, 4, 4, 4, 4, 4, 4, 4};      // negative for top level
int x;      //sets variables
int d;
int c;


void setup ()
{
}

void one(int wait)      // bottom level light sequence
                        // wait can be defined in the void loop
{
 for(x=0; x<=8; x++)    // variable for different numbers in
                        // the aray corresponding to there place   
    {
      pinMode(anode[x], OUTPUT);    // sets as output
      pinMode(catone[x], OUTPUT);
      digitalWrite(anode[x], HIGH);  // turns on positives 
      digitalWrite(catone[x], LOW);  // turns on negatives
      delay(wait);                   // if you don't know what delay is your a moron    
      pinMode(anode[x], INPUT);      //sets them back to inputs so the lights turn off
      pinMode(catone[x], INPUT);
    }  
}

void two(int wait)
{  for(x=0; x<=8; x++)
    {
      pinMode(anode2[x], OUTPUT);
      pinMode(cattwo[x], OUTPUT);
      digitalWrite(anode2[x], HIGH);
      digitalWrite(cattwo[x], LOW);
      delay(wait);
      pinMode(anode2[x], INPUT);
      pinMode(cattwo[x], INPUT);
    } 
}

void three(int wait)
{  for(x=0; x<=8; x++)
    {
      pinMode(anode[x], OUTPUT);
      pinMode(catthree[x], OUTPUT);
      digitalWrite(anode[x], HIGH);
      digitalWrite(catthree[x], LOW);
      delay(wait);
      pinMode(anode[x], INPUT);
      pinMode(catthree[x], INPUT);
    } 
} 

void column(int wait) // loops through columns
{
 for(x=0; x<=8; x++)  // loops through the aray
  {
    pinMode(anode[x], OUTPUT);
      for(d=1; d<=wait; d++)  // delay on each column
     {
        for(c=2; c<=4; c++)  // loops through lights on a column
        {
          pinMode(c, OUTPUT);
          digitalWrite(anode[x], HIGH);
          digitalWrite(c, LOW);
          pinMode(c, INPUT);
          delayMicroseconds(100);
        }
     }
  pinMode(anode[x], INPUT);    
  }
}

void levelone (int wait)  // turns entire level on
{
  for(d=1; d<=wait; d++)
  {
     for(x=0; x<=8; x++)
      {
        pinMode(anode[x], OUTPUT);
        pinMode(catone[x], OUTPUT);
        digitalWrite(anode[x], HIGH);
        digitalWrite(catone[x], LOW);
        delayMicroseconds(100);        // loops really fast so it looks like
        pinMode(anode[x], INPUT);      // all the lights are one at the same time
        pinMode(catone[x], INPUT);
      }   
  } 
}

void leveltwo (int wait)
{
  for(d=1; d<=wait; d++)
  {
     for(x=0; x<=8; x++)
      {
        pinMode(anode[x], OUTPUT);
        pinMode(cattwo[x], OUTPUT);
        digitalWrite(anode[x], HIGH);
        digitalWrite(cattwo[x], LOW);
        delayMicroseconds(100);
        pinMode(anode[x], INPUT);
        pinMode(cattwo[x], INPUT);
      }   
  } 
}

void levelthree (int wait)
{
  for(d=1; d<=wait; d++)
  {
     for(x=0; x<=8; x++)
      {
        pinMode(anode[x], OUTPUT);
        pinMode(catthree[x], OUTPUT);
        digitalWrite(anode[x], HIGH);
        digitalWrite(catthree[x], LOW);
        delayMicroseconds(100);
        pinMode(anode[x], INPUT);
        pinMode(catthree[x], INPUT);
      }   
  } 
}

void randlight(int repeat) // number of lights turned on
{
  randomSeed (millis());        // random lights
  for (int d=1; d<=repeat; d++)
  {
  x=random(0,9);
  c=random(2,5);
        pinMode(anode[x], OUTPUT);
        pinMode(c, OUTPUT);
        digitalWrite(anode[x], HIGH);
        digitalWrite(c, LOW);
  delay(100);
        pinMode(anode[x], INPUT);
        pinMode(c, INPUT);
  } 
}

void loop ()
{
   one(50);
   two(50);
   three(50);
   two(50);
   one(50);
   column(500);
   levelthree(500);
   leveltwo(500);
   levelone(500);
   one(75);
   leveltwo(500);
   two(75);
   levelthree(500);
   three(75);
   randlight(100);
  
}