Arduino Controlled Tree - http://youtu.be/MD3-YBaFQvw

#include<FastLED.h>

#define NUM_MODES 12
#define LIGHT_TEST 0

#define MAX_BRIGHT 150

byte state = 1;
int index = 0;               //-LED INDEX (0 to LED_COUNT-1)

byte thisbright = 128;
byte thissat = 255;
int thisdelay = 20;
byte thisstep = 10;
byte thishue = 0;

byte demoMode = 0;
#define DEMO_COUNT 1600;
int demoStateCountdown;
byte interrupt = 0;

// How many leds are in the strip?
// Be careful with the num leds. The animations that make use of the levels
// will walk right off the led array. The numbers are specific to my led
// tree. If you are using less leds or are not interested in the layer animations
// you should remove them from the loop or set USE_LEVEL_ANIMATIONS to 0
//#define NUM_LEDS 30 // LED Strip
//#define LED_TYPE    WS2812B // LED Strip
//#define COLOR_ORDER GRB // LED Strip
#define NUM_LEDS 348 // Tree
#define LED_TYPE    WS2811 // Tree
#define COLOR_ORDER RGB // Tree

byte USE_LEVEL_ANIMATIONS = 1; // if 1, will auto advance past level animations
#define NUM_LEVELS 12
const PROGMEM prog_uint16_t levels[NUM_LEVELS] = {58, 108, 149, 187, 224, 264, 292, 309, 321, 327, 336, 348};

// Data pin that led data will be written out over
#define DATA_PIN 3
// This is an array of leds.  One item for each led in your strip.
CRGB leds[NUM_LEDS];

/////////////////////////////////////////////////////////////////////////
// Setup for danger shield
//
// I used the Danger Shield to play with animation speed, brightness and for initial
// debug. I used it to lock the animation on one type, showed the animation
// number in the LED, etc. I wrote the code to use it or not.
/////////////////////////////////////////////////////////////////////////

byte useDSCtrl = 0; // Set to 1 if you want to play with the Danger Shield

// Shift register bit values to display 0-9 on the seven-segment display
const PROGMEM prog_uchar ledCharSet[20] = {
  B00111111,B00000110,B01011011,B01001111,B01100110,B01101101,B01111101,B00000111,B01111111,B01101111,
  B10111111,B10000110,B11011011,B11001111,B11100110,B11101101,B11111101,B10000111,B11111111,B11101111
};

// Pin definitions
#define SLIDER1  0
#define SLIDER2  1
#define SLIDER3  2

#define DATA 4
#define LED1  5
#define LED2  6
#define LATCH 7
#define CLOCK 8
#define BUTTON1  10
#define BUTTON2  11
#define BUTTON3  12

/////////////////////////////////////////////////////////////////////////
// End setup for danger shield
/////////////////////////////////////////////////////////////////////////

void setup()
{
  // sanity check delay - allows reprogramming if accidently blowing power w/leds
  delay(2000);

  initDSCtrls();

  FastLED.addLeds<LED_TYPE, DATA_PIN, COLOR_ORDER>(leds, NUM_LEDS);
  FastLED.setBrightness(MAX_BRIGHT);
  one_color_all(0,0,0);
  FastLED.show();
  delay(1000);
  countdown();
  setDemoMode();
}

static void initDSCtrls()
{
  if (!useDSCtrl) return;

  // Init LED 1
  pinMode(LED1, OUTPUT);
  blinkLED1();

  // Init LED 2
  pinMode(LED2, OUTPUT);
  digitalWrite(LED2,LOW);

  // Init Digit Display
  pinMode(LATCH, OUTPUT);
  pinMode(CLOCK, OUTPUT);
  pinMode(DATA,OUTPUT);

  // Init buttons
  pinMode(BUTTON1,INPUT);
  pinMode(BUTTON2,INPUT);
  pinMode(BUTTON3,INPUT);

  digitalWrite(BUTTON1,HIGH);
  digitalWrite(BUTTON2,HIGH);
  digitalWrite(BUTTON3,HIGH);
}

void blinkLED1()
{
  if (!useDSCtrl) return;

  digitalWrite(LED1, LOW);
  delay(50);
  for (int idx = 0; idx < 3; idx++)
  {
    digitalWrite(LED1, HIGH);
    delay(50);
    digitalWrite(LED1, LOW);
    delay(50);
  }
}

void countdown()
{
  if (!useDSCtrl) return;

  for (int index=3; index >= 0; index--)
  {
    state = index;
    updateState();
    delay(1000);
  }
  state = 1;
  updateState();
}

void one_color_all(int cred, int cgrn, int cblu)
{       //-SET ALL LEDS TO ONE COLOR
    for(int i = 0 ; i < NUM_LEDS; i++ ) {
      leds[i].setRGB( cred, cgrn, cblu).nscale8_video(thisbright);
    }
}

void colorTest()
{
  one_color_all(0,0,0);
  FastLED.show();
  delay(1000);
  one_color_all(255,0,0);
  FastLED.show();
  delay(1000);
  one_color_all(0,0,0);
  FastLED.show();
  delay(1000);
  one_color_all(0,255,0);
  FastLED.show();
  delay(1000);
  one_color_all(0,0,0);
  FastLED.show();
  delay(1000);
  one_color_all(0,0,255);
  FastLED.show();
  delay(1000);
}

void dotTest()
{
   // Move a single white led
   for(int whiteLed = 0; whiteLed < NUM_LEDS; whiteLed = whiteLed + 1) {
      // Turn our current led on to white, then show the leds
      leds[whiteLed] = CRGB::White;
      // Show the leds (only one of which is set to white, from above)
      FastLED.show();
      // Wait a little bit
      delay(10);
      // Turn our current led back to black for the next loop around
      leds[whiteLed] = CRGB::Black;
   }
}

void lightTest()
{
  colorTest();
  dotTest();
}

void random_burst()
{
  int rndidx = random16(0, NUM_LEDS);
  int rndhue = random8(0, 255);
  int rndbright = random8(10, thisbright);
  leds[rndidx] = CHSV(rndhue, thissat, rndbright);
  delay(random8(0, thisdelay));
}

void rgb_propeller()
{
  thishue = 0;
  index++;
  int ghue = (thishue + 80) % 255;
  int bhue = (thishue + 160) % 255;
  int N3  = int(NUM_LEDS/3);
  int N6  = int(NUM_LEDS/6);
  int N12 = int(NUM_LEDS/12);
  for(int i = 0; i < N3; i++ ) {
    int j0 = (index + i + NUM_LEDS - N12) % NUM_LEDS;
    int j1 = (j0+N3) % NUM_LEDS;
    int j2 = (j1+N3) % NUM_LEDS;
    leds[j0] = CHSV(thishue, thissat, thisbright);
    leds[j1] = CHSV(ghue, thissat, thisbright);
    leds[j2] = CHSV(bhue, thissat, thisbright);
  }
}

void candycane()
{
  index++;
  int N3  = int(NUM_LEDS/3);
  int N6  = int(NUM_LEDS/6);
  int N12 = int(NUM_LEDS/12);
  for(int i = 0; i < N6; i++ ) {
    int j0 = (index + i + NUM_LEDS - N12) % NUM_LEDS;
    int j1 = (j0+N6) % NUM_LEDS;
    int j2 = (j1+N6) % NUM_LEDS;
    int j3 = (j2+N6) % NUM_LEDS;
    int j4 = (j3+N6) % NUM_LEDS;
    int j5 = (j4+N6) % NUM_LEDS;
    leds[j0] = CRGB(255, 255, 255).nscale8_video(thisbright*.75);
    leds[j1] = CRGB(255, 0, 0).nscale8_video(thisbright);
    leds[j2] = CRGB(255, 255, 255).nscale8_video(thisbright*.75);
    leds[j3] = CRGB(255, 0, 0).nscale8_video(thisbright);
    leds[j4] = CRGB(255, 255, 255).nscale8_video(thisbright*.75);
    leds[j5] = CRGB(255, 0, 0).nscale8_video(thisbright);
  }
}

void rainbow_loop()
{
  index++;
  thishue = thishue + thisstep;
  if (index >= NUM_LEDS) {index = 0;}
  if (thishue > 255) {thishue = 0;}
  leds[index] = CHSV(thishue, thissat, thisbright);
}

void fill_rainbow_ctrl( struct CRGB * pFirstLED, int numToFill,
                  uint8_t initialhue,
                  uint8_t deltahue,
          uint8_t saturation,
          uint8_t brightness)
{
    CHSV hsv;
    hsv.hue = initialhue;
    hsv.sat = saturation;
    hsv.val = brightness;
    for( int i = 0; i < numToFill; i++) {
        hsv2rgb_rainbow( hsv, pFirstLED[i]);
        hsv.hue += deltahue;
    }
}

void rainbow()
{
  fill_rainbow_ctrl( leds, NUM_LEDS, thishue, thisstep, thissat, thisbright);
  thishue++;
}

void clear_all()
{
  one_color_all(0, 0, 0);
  LEDS.show();
  delay(50);
}

void clear_level(int level)
{
  int startPxl;
  if (level == 0)
    startPxl = 0;
  else
    startPxl = pgm_read_word(&(levels[level-1]));

  for(int i = startPxl; i < pgm_read_word(&(levels[level])); i++)
  {
    leds[i] = CRGB::Black;
  }
}

void light_level_random(int level, byte clearall = 1)
{
  if (clearall)
    clear_all();

  int startPxl;
  if (level == 0)
    startPxl = 0;
  else
    startPxl = pgm_read_word(&(levels[level-1]));

  for(int i = startPxl; i < pgm_read_word(&(levels[level])); i++)
  {
    leds[i] = CHSV(random8(), random8(50, thissat), random8(50, thisbright));
  }
}

void quick_random_fill()
{
  for (int i = 0; i < NUM_LEDS; i++)
  {
    leds[i] = CHSV(random8(), random8(), random8(10, thisbright));
  }
}

void light_level(int level, byte red, byte green, byte blue, byte clearall = 1)
{
  if (clearall)
    clear_all();

  int startPxl;
  if (level == 0)
    startPxl = 0;
  else
    startPxl = pgm_read_word(&(levels[level-1]));

  for(int i = startPxl; i < pgm_read_word(&(levels[level])); i++)
  {
    leds[i].setRGB(red, green, blue).nscale8_video(thisbright);
  }
}

void drain()
{
  for (int pancakeLevel = 0; pancakeLevel < NUM_LEVELS; pancakeLevel++)
  {
    updateControlVars();
    if (interrupt) return;
    for (int level = pancakeLevel; level >= 0; level--)
    {
      updateControlVars();
      if (interrupt) return;
      clear_level(level);
      if (level >= 1) light_level_random(level-1, 0);

      LEDS.show();
      delay(75);
    }
  }
}

void pancake()
{
  for (int pancakeLevel = 0; pancakeLevel < NUM_LEVELS; pancakeLevel++)
  {
    updateControlVars();
    if (interrupt) return;
    for (int level = NUM_LEVELS-1; level >= pancakeLevel; level--)
    {
      updateControlVars();
      if (interrupt) return;
      if (level < NUM_LEVELS-1) clear_level(level+1);
      light_level_random(level, 0);

      LEDS.show();
      delay(75);
    }
  }
}

void alternate_levels()
{
  static int level = 0;
  light_level(level, dim8_video(random8()), dim8_video(random8()), dim8_video(random8()));
  level++;
  if (level == NUM_LEVELS) level = 0;
}

void random_levels()
{
  int level = random(NUM_LEVELS);
  if (NUM_LEVELS == level) level = 0;
  light_level_random(level, 1);
}

void rainbow_fade()
{
    thishue++;
    if (thishue > 255) {thishue = 0;}
    for(int idex = 0 ; idex < NUM_LEDS; idex++ ) {
      leds[idex] = CHSV(thishue, thissat, thisbright);
    }
}

void twinkle( CRGB* L ) {
  static byte huebase = 0;

  //slowly rotate huebase
  if( random8(4) == 0) huebase--;

  for( int whichPixel = 0; whichPixel < NUM_LEDS; whichPixel++) {
    int hue = random8(32) + huebase;
    int saturation = 255;    // richest color
    int brightness = dim8_video( dim8_video( dim8_video( random8())));

    L[whichPixel] = CHSV( hue, saturation, brightness);
  }
}

void matrix()
{
  int rand = random8(0, 100);
  if (rand > 90) {
    leds[0] = CHSV(random8(), thissat, thisbright);
  }
  else {
    leds[0] = CHSV(0, thissat, 0);
  }

  for(int i = NUM_LEDS-1; i > 0; i--)
  {
    leds[i] = leds[i-1];
  }
}

void correct_color_balance()
{
  for( int i = 0; i < NUM_LEDS; i++) {
    leds[i].g = scale8_video( leds[i].g, 192);
  }
}


CHSV sv_ramp( uint8_t hue, uint8_t ramp) {
  uint8_t brightness;
  uint8_t saturation;
  if( ramp < 128) {
    // fade toward black
    brightness = ramp * 2;
    brightness = dim8_video( brightness);
//    uint8_t global_brightness = FastLED.getBrightness();
//    uint8_t min_step = 256 / global_brightness;
//    brightness = qadd8( min_step * 16, brightness);
    saturation = 255;
  } else {
    // desaturate toward white
    brightness = 255;
    saturation = 255 - ((ramp - 128) * 2);
    saturation = 255 - dim8_video( 255 - saturation);
  }
  return CHSV( hue, saturation, brightness); }

void loop5( CRGB* L )
{
  uint8_t GB = FastLED.getBrightness();
  uint8_t boost = 0;
//  if( GB < 65) boost += 8;
//  if( GB < 33) boost += 8;

  uint8_t N = 2;

  static uint16_t starttheta = 0;
  starttheta += 100 / N;

  static uint16_t starthue16 = 0;
  starthue16 += 20 / N;


  uint16_t hue16 = starthue16;
  uint16_t theta = starttheta;
  for( int i = 0; i < NUM_LEDS; i++) {
    uint8_t frac = (sin16( theta) + 32768) / 256;
    frac = scale8(frac,160) + 32;
    theta += 3700;

    hue16 += 2000;
    uint8_t hue = hue16 / 256;
    L[i] = sv_ramp( hue, frac + boost);
  }
}

//---FIND ADJACENT INDEX CLOCKWISE
int adjacent_cw(int i) {
  int r;
  if (i < NUM_LEDS - 1) {r = i + 1;}
  else {r = 0;}
  return r;
}

//---FIND ADJACENT INDEX COUNTER-CLOCKWISE
int adjacent_ccw(int i) {
  int r;
  if (i > 0) {r = i - 1;}
  else {r = NUM_LEDS - 1;}
  return r;
}

void random_march()
{
  int iCCW;
  for(int idex = 0; idex < NUM_LEDS; idex++ ) {
    iCCW = adjacent_ccw(idex);
    leds[idex] = leds[idex+1];
  }
  leds[NUM_LEDS-1] = CHSV(random8(), thissat, thisbright);
}

void updateState()
{
  if (!useDSCtrl) return;

  if (interrupt)
  {
    interrupt = 0;
  }

  // Numeric display
  digitalWrite(LATCH,LOW);
  shiftOut(DATA,CLOCK,MSBFIRST,~(pgm_read_word(&(ledCharSet[state]))));
  digitalWrite(LATCH,HIGH);
  // Reset LED1
  digitalWrite(LED1, LOW);
}

void incrementState()
{
  state++;
  if(state > NUM_MODES){
    state = 1;
  }
}

void readForStateChange()
{
  if (!useDSCtrl) return;

  if(!(digitalRead(BUTTON1))) // Change state
  {
    delay(1); // Debounce
    incrementState();
    interrupt = 1;
    while(!(digitalRead(BUTTON1)));
  }
}

void readForInterrupt()
{
  if(!(digitalRead(BUTTON2))) // Change state
  {
    delay(1); // Debounce
    interrupt = 1;
    demoMode = 0;
    digitalWrite(LED1,HIGH);
    digitalWrite(LED2,LOW);
  }
}

void setDemoMode()
{
    demoMode = 1;
    demoStateCountdown = DEMO_COUNT;
    digitalWrite(LED2,HIGH);
}

void readForDemo()
{
  if(!(digitalRead(BUTTON3))) // Change state
  {
    delay(1); // Debounce
    setDemoMode();
  }
}

void updateControlVars()
{
  if (useDSCtrl)
  {
    int s1Val = analogRead(SLIDER1);
    int s2Val = analogRead(SLIDER2);
    int s3Val = analogRead(SLIDER3);

    thissat = (s2Val/4 < 50) ? 50 : s2Val/4;
    thisdelay = s3Val*2;
    thisbright = (s1Val/4 < 20) ? 20 : s1Val/4;

    readForStateChange();
    readForInterrupt();
    readForDemo();
  }
  else
  {
  }
}

byte alt = 0;
void loop() {
  if (LIGHT_TEST)
  {
    lightTest();
    return;
  }

  demoStateCountdown = (demoStateCountdown < 0) ? 0 : demoStateCountdown;

  if (useDSCtrl)
  {
    if (alt < 10) {
      digitalWrite(LED1, HIGH);
      alt++;
    } else {
      digitalWrite(LED1, LOW);
      alt++;
      if (alt == 20) alt=0;
    }
  }

  if (demoMode)
  {
    demoStateCountdown--;
    if (demoStateCountdown <= 0)
    {
      blinkLED1();
      incrementState();
      demoStateCountdown = DEMO_COUNT;
    }
  }

  updateControlVars();
  int adjdelay = thisdelay;
  updateState();

  switch (state)
  {
    case 1:
      random_burst();
    break;
    case 2:
      rgb_propeller();
    break;
    case 3:
      rainbow();
    break;
    case 4:
      rainbow_fade();
      if ((demoMode) && !(demoStateCountdown%5)) demoStateCountdown-=2;
      adjdelay = (adjdelay < 30) ? 30 : adjdelay;
    break;
    case 5:
      rainbow_loop();
    break;
    case 6:
      if ((demoMode) && !(demoStateCountdown%5)) demoStateCountdown-=2;
      adjdelay = (adjdelay < 50) ? 50 : adjdelay;
      matrix();
    break;
    case 7:
      demoStateCountdown -= 2;
      adjdelay = (adjdelay < 120) ? 120 : adjdelay;
      random_march();
    break;
    case 8:
      loop5(leds);
      adjdelay = adjdelay/3;
    break;
    case 9:
      twinkle(leds);
    break;
    case 10:
      candycane();
    break;
    case 11:
      if (!USE_LEVEL_ANIMATIONS) incrementState();
      adjdelay = (adjdelay < 100) ? 100 : adjdelay;
      demoStateCountdown -= 15;
      random_levels();
    break;
    case 12:
      if (!USE_LEVEL_ANIMATIONS) incrementState();
      rainbow();
      adjdelay = (adjdelay < 50) ? 50 : adjdelay;
      if (demoMode) demoStateCountdown -= 600;
      drain();
      pancake();
    break;
    default:
      random_burst();
    break;
  }
  FastLED.show();
  delay(adjdelay);
}