torch.ino

/*
 * Torch: https://github.com/evilgeniuslabs/torch
 * Copyright (C) 2015 Jason Coon
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <FastLED.h>
#include <IRremote.h>
#include <EEPROM.h>
#include <Bounce2.h>

#if FASTLED_VERSION < 3001000
#error "Requires FastLED 3.1 or later; check github for latest code."
#endif

#define LED_PIN     11
#define IR_RECV_PIN 12
#define COLOR_ORDER GRB
#define CHIPSET     WS2812B
#define NUM_LEDS    240

const uint8_t MATRIX_WIDTH = 14;
const uint8_t MATRIX_HEIGHT = 17;

const int MATRIX_CENTER_X = MATRIX_WIDTH / 2;
const int MATRIX_CENTER_Y = MATRIX_HEIGHT / 2;

const byte MATRIX_CENTRE_X = MATRIX_CENTER_X - 1;
const byte MATRIX_CENTRE_Y = MATRIX_CENTER_Y - 1;

const uint8_t brightnessCount = 5;
uint8_t brightnessMap[brightnessCount] = { 16, 32, 64, 128, 255 };
uint8_t brightness = brightnessMap[0];

CRGB leds[NUM_LEDS + 1];
IRrecv irReceiver(IR_RECV_PIN);

#define BUTTON_1_PIN 16
#define BUTTON_2_PIN 17

Bounce button1 = Bounce();
Bounce button2 = Bounce();

#include "Commands.h"
#include "GradientPalettes.h"

CRGB solidColor = CRGB::White;

typedef uint16_t(*PatternFunctionPointer)();
typedef PatternFunctionPointer PatternList [];
#define ARRAY_SIZE(A) (sizeof(A) / sizeof((A)[0]))

int autoPlayDurationSeconds = 10;
unsigned int autoPlayTimout = 0;
bool autoplayEnabled = false;

InputCommand command;

int currentPatternIndex = 0;
PatternFunctionPointer currentPattern;

CRGB w(85, 85, 85), W(CRGB::White);
CRGBPalette16 snowColors = CRGBPalette16( W, W, W, W, w, w, w, w, w, w, w, w, w, w, w, w );

CRGB l(0xE1A024);
CRGBPalette16 incandescentColors = CRGBPalette16( l, l, l, l, l, l, l, l, l, l, l, l, l, l, l, l );

const CRGBPalette16 palettes[] = {
  RainbowColors_p,
  RainbowStripeColors_p,
  OceanColors_p,
  CloudColors_p,
  ForestColors_p,
  PartyColors_p,
  HeatColors_p,
  LavaColors_p,
  snowColors,
};

const int paletteCount = ARRAY_SIZE(palettes);

int currentPaletteIndex = 0;
CRGBPalette16 palette = palettes[0];

uint8_t gHue = 0; // rotating "base color" used by many of the patterns

#include "Drawing.h"
#include "Effects.h"

#include "Noise.h"
#include "Pulse.h"
#include "Wave.h"
#include "Fire2012WithPalette.h"
#include "Torch.h"
#include "AudioLogic.h"
#include "AudioPatterns.h"

const PatternList patterns = {
  analyzerColumns,
  analyzerColumnsSolid,
  analyzerPixels,
  fallingSpectrogram,
  audioFire,
  rainbowAudioNoise,
  rainbowStripeAudioNoise,
  partyAudioNoise,
  forestAudioNoise,
  cloudAudioNoise,
  fireAudioNoise,
  lavaAudioNoise,
  oceanAudioNoise,
  blackAndWhiteAudioNoise,
  blackAndBlueAudioNoise,
  fireNoise,
  lavaNoise,
  torch,
  fire2012WithPalette,
  rainbowNoise,
  rainbowStripeNoise,
  partyNoise,
  forestNoise,
  cloudNoise,
  oceanNoise,
  blackAndWhiteNoise,
  blackAndBlueNoise,
  pulse,
  wave,
  pride,
  colorWaves,
  rainbow,
  rainbowWithGlitter,
  confetti,
  bpm,
  juggle,
  sinelon,
  hueCycle,
  rainbowTwinkles,
  snowTwinkles,
  cloudTwinkles,
  incandescentTwinkles,
  fireflies,
  showSolidColor
};

const int patternCount = ARRAY_SIZE(patterns);

void setup() {
  delay(500); // sanity delay
  // Serial.begin(9600);
  // Serial.println("setup start");

  loadSettings();

  FastLED.addLeds<CHIPSET, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS);
  FastLED.setCorrection(TypicalLEDStrip);
  FastLED.setBrightness(brightness);
  //  FastLED.setDither(false);
  FastLED.setDither(brightness < 255);

  // Initialize the IR receiver
  irReceiver.enableIRIn();
  irReceiver.blink13(true);

  pinMode(BUTTON_1_PIN, INPUT_PULLUP);
  pinMode(BUTTON_2_PIN, INPUT_PULLUP);
  button1.attach(BUTTON_1_PIN);
  button2.attach(BUTTON_2_PIN);
  button1.interval(5);
  button2.interval(5);

  currentPattern = patterns[currentPatternIndex];

  autoPlayTimout = millis() + (autoPlayDurationSeconds * 1000);

  initializeAudio();

  // Serial.println("setup end");
}

void loop() {
  // Add entropy to random number generator; we use a lot of it.
  random16_add_entropy(random());

  EVERY_N_MILLISECONDS(30) {
    readAudio();
  }

  uint16_t requestedDelay = currentPattern();

  FastLED.show(); // display this frame

  handleInput(requestedDelay);

  if (autoplayEnabled && millis() > autoPlayTimout) {
    move(1);
    autoPlayTimout = millis() + (autoPlayDurationSeconds * 1000);
  }

  // do some periodic updates
  EVERY_N_MILLISECONDS(20) {
    gHue++;  // slowly cycle the "base color" through the rainbow
  }
}

void loadSettings() {
  // load settings from EEPROM

  // brightness
  brightness = EEPROM.read(0);
  if (brightness < 1)
    brightness = 1;
  else if (brightness > 255)
    brightness = 255;

  // currentPatternIndex
  currentPatternIndex = EEPROM.read(1);
  if (currentPatternIndex < 0)
    currentPatternIndex = 0;
  else if (currentPatternIndex >= patternCount)
    currentPatternIndex = patternCount - 1;

  // solidColor
  solidColor.r = EEPROM.read(2);
  solidColor.g = EEPROM.read(3);
  solidColor.b = EEPROM.read(4);

  if (solidColor.r == 0 && solidColor.g == 0 && solidColor.b == 0)
    solidColor = CRGB::White;
}

void setSolidColor(CRGB color) {
  solidColor = color;

  EEPROM.write(2, solidColor.r);
  EEPROM.write(3, solidColor.g);
  EEPROM.write(4, solidColor.b);

  moveTo(patternCount - 1);
}

void powerOff()
{
  // clear the display
  const uint8_t stepSize = 4;

  for (uint8_t i = 0; i < NUM_LEDS / 2 - stepSize; i += stepSize) {
    for (uint8_t j = 0; j < stepSize; j++) {
      leds[i + j] = CRGB::Black;
      leds[(NUM_LEDS - 1) - (i + j)] = CRGB::Black;
    }
    FastLED.show(); // display this frame
  }

  fill_solid(leds, NUM_LEDS, CRGB::Black);

  FastLED.show(); // display this frame

  while (true) {
    // check for physical button input
    button1.update();
    button2.update();

    if (button1.rose() || button2.rose()) {
      Serial.println("Button released");
      return;
    }

    // check for ir remote input
    InputCommand command = readCommand();
    if (command != InputCommand::None)
      return;
  }
}

void move(int delta) {
  moveTo(currentPatternIndex + delta);
}

void moveTo(int index) {
  currentPatternIndex = index;

  if (currentPatternIndex >= patternCount)
    currentPatternIndex = 0;
  else if (currentPatternIndex < 0)
    currentPatternIndex = patternCount - 1;

  currentPattern = patterns[currentPatternIndex];

  fill_solid(leds, NUM_LEDS, CRGB::Black);

  EEPROM.write(1, currentPatternIndex);
}

int getBrightnessLevel() {
  int level = 0;
  for (int i = 0; i < brightnessCount; i++) {
    if (brightnessMap[i] >= brightness) {
      level = i;
      break;
    }
  }
  return level;
}

uint8_t cycleBrightness() {
  adjustBrightness(1);

  if (brightness == brightnessMap[0])
    return 0;

  return brightness;
}

void adjustBrightness(int delta) {
  int level = getBrightnessLevel();

  level += delta;

  // don't wrap
  if (level < 0)
    level = 0;
  if (level >= brightnessCount)
    level = brightnessCount - 1;

  brightness = brightnessMap[level];
  FastLED.setBrightness(brightness);
  FastLED.setDither(brightness < 255);

  EEPROM.write(0, brightness);
}

void cyclePalette(int delta = 1) {
  if (currentPaletteIndex == 0 && delta < 0)
    currentPaletteIndex = paletteCount - 1;
  else if (currentPaletteIndex >= paletteCount - 1 && delta > 0)
    currentPaletteIndex = 0;
  else
    currentPaletteIndex += delta;

  if (currentPaletteIndex >= paletteCount)
    currentPaletteIndex = 0;

  palette = palettes[currentPaletteIndex];
}

unsigned long button1PressTimeStamp;
unsigned long button2PressTimeStamp;

void handleInput(unsigned int requestedDelay) {
  unsigned int requestedDelayTimeout = millis() + requestedDelay;

  while (true) {
    // check for physical button input
    button1.update();
    button2.update();

    if (button1.fell()) {
      Serial.println("Button 1 depressed");
      button1PressTimeStamp = millis();
    }

    if (button2.fell()) {
      Serial.println("Button 2 depressed");
      button2PressTimeStamp = millis();
    }

    if (button1.rose()) {
      Serial.println("Button 1 released");
      move(1);
    }

    if (button2.rose()) {
      Serial.println("Button 2 released");
      powerOff();
      break;
    }

    command = readCommand(defaultHoldDelay);

    if (command != InputCommand::None) {
      // Serial.print("command: ");
      // Serial.println((int) command);
    }

    if (command == InputCommand::Up) {
      move(1);
      break;
    }
    else if (command == InputCommand::Down) {
      move(-1);
      break;
    }
    else if (command == InputCommand::Brightness) {
      if (isHolding || cycleBrightness() == 0) {
        heldButtonHasBeenHandled();
        powerOff();
        break;
      }
    }
    else if (command == InputCommand::Power) {
      powerOff();
      break;
    }
    else if (command == InputCommand::BrightnessUp) {
      adjustBrightness(1);
    }
    else if (command == InputCommand::BrightnessDown) {
      adjustBrightness(-1);
    }
    else if (command == InputCommand::PlayMode) { // toggle pause/play
      autoplayEnabled = !autoplayEnabled;
    }
    else if (command == InputCommand::NextPalette) { // cycle color palette
      cyclePalette(1);
    }
    else if (command == InputCommand::PreviousPalette) { // cycle color palette
      cyclePalette(-1);
    }

    // pattern buttons

    else if (command == InputCommand::Pattern1) {
      moveTo(0);
      break;
    }
    else if (command == InputCommand::Pattern2) {
      moveTo(1);
      break;
    }
    else if (command == InputCommand::Pattern3) {
      moveTo(2);
      break;
    }
    else if (command == InputCommand::Pattern4) {
      moveTo(3);
      break;
    }
    else if (command == InputCommand::Pattern5) {
      moveTo(4);
      break;
    }
    else if (command == InputCommand::Pattern6) {
      moveTo(5);
      break;
    }
    else if (command == InputCommand::Pattern7) {
      moveTo(6);
      break;
    }
    else if (command == InputCommand::Pattern8) {
      moveTo(7);
      break;
    }
    else if (command == InputCommand::Pattern9) {
      moveTo(8);
      break;
    }
    else if (command == InputCommand::Pattern10) {
      moveTo(9);
      break;
    }
    else if (command == InputCommand::Pattern11) {
      moveTo(10);
      break;
    }
    else if (command == InputCommand::Pattern12) {
      moveTo(11);
      break;
    }

    // custom color adjustment buttons

    else if (command == InputCommand::RedUp) {
      solidColor.red += 1;
      setSolidColor(solidColor);
      break;
    }
    else if (command == InputCommand::RedDown) {
      solidColor.red -= 1;
      setSolidColor(solidColor);
      break;
    }
    else if (command == InputCommand::GreenUp) {
      solidColor.green += 1;
      setSolidColor(solidColor); \
      break;
    }
    else if (command == InputCommand::GreenDown) {
      solidColor.green -= 1;
      setSolidColor(solidColor);
      break;
    }
    else if (command == InputCommand::BlueUp) {
      solidColor.blue += 1;
      setSolidColor(solidColor);
      break;
    }
    else if (command == InputCommand::BlueDown) {
      solidColor.blue -= 1;
      setSolidColor(solidColor);
      break;
    }

    // color buttons

    else if (command == InputCommand::Red && currentPatternIndex != patternCount - 2 && currentPatternIndex != patternCount - 3) { // Red, Green, and Blue buttons can be used by ColorInvaders game, which is the next to last pattern
      setSolidColor(CRGB::Red);
      break;
    }
    else if (command == InputCommand::RedOrange) {
      setSolidColor(CRGB::OrangeRed);
      break;
    }
    else if (command == InputCommand::Orange) {
      setSolidColor(CRGB::Orange);
      break;
    }
    else if (command == InputCommand::YellowOrange) {
      setSolidColor(CRGB::Goldenrod);
      break;
    }
    else if (command == InputCommand::Yellow) {
      setSolidColor(CRGB::Yellow);
      break;
    }

    else if (command == InputCommand::Green && currentPatternIndex != patternCount - 2 && currentPatternIndex != patternCount - 3) { // Red, Green, and Blue buttons can be used by ColorInvaders game, which is the next to last pattern
      setSolidColor(CRGB::Green);
      break;
    }
    else if (command == InputCommand::Lime) {
      setSolidColor(CRGB::Lime);
      break;
    }
    else if (command == InputCommand::Aqua) {
      setSolidColor(CRGB::Aqua);
      break;
    }
    else if (command == InputCommand::Teal) {
      setSolidColor(CRGB::Teal);
      break;
    }
    else if (command == InputCommand::Navy) {
      setSolidColor(CRGB::Navy);
      break;
    }

    else if (command == InputCommand::Blue && currentPatternIndex != patternCount - 2 && currentPatternIndex != patternCount - 3) { // Red, Green, and Blue buttons can be used by ColorInvaders game, which is the next to last pattern
      setSolidColor(CRGB::Blue);
      break;
    }
    else if (command == InputCommand::RoyalBlue) {
      setSolidColor(CRGB::RoyalBlue);
      break;
    }
    else if (command == InputCommand::Purple) {
      setSolidColor(CRGB::Purple);
      break;
    }
    else if (command == InputCommand::Indigo) {
      setSolidColor(CRGB::Indigo);
      break;
    }
    else if (command == InputCommand::Magenta) {
      setSolidColor(CRGB::Magenta);
      break;
    }

    else if (command == InputCommand::White && currentPatternIndex != patternCount - 2 && currentPatternIndex != patternCount - 3) {
      setSolidColor(CRGB::White);
      break;
    }
    else if (command == InputCommand::Pink) {
      setSolidColor(CRGB::Pink);
      break;
    }
    else if (command == InputCommand::LightPink) {
      setSolidColor(CRGB::LightPink);
      break;
    }
    else if (command == InputCommand::BabyBlue) {
      setSolidColor(CRGB::CornflowerBlue);
      break;
    }
    else if (command == InputCommand::LightBlue) {
      setSolidColor(CRGB::LightBlue);
      break;
    }

    if (millis() >= requestedDelayTimeout)
      break;
  }
}

uint16_t XY( uint8_t x, uint8_t y) // maps the matrix to the strip
{
  uint16_t i;
  i = (y * MATRIX_WIDTH) + (MATRIX_WIDTH - x);

  i = (NUM_LEDS - 1) - i;

  if (i > NUM_LEDS)
    i = NUM_LEDS;

  return i;
}

// scale the brightness of the screenbuffer down
void dimAll(byte value)
{
  for (int i = 0; i < NUM_LEDS; i++) {
    leds[i].nscale8(value);
  }
}

uint16_t showSolidColor() {
  fill_solid(leds, NUM_LEDS, solidColor);

  return 60;
}

uint16_t rainbow()
{
  // FastLED's built-in rainbow generator
  fill_rainbow(leds, NUM_LEDS, gHue, 1);

  return 8;
}

uint16_t rainbowWithGlitter()
{
  // built-in FastLED rainbow, plus some random sparkly glitter
  rainbow();
  addGlitter(80);
  return 8;
}

void addGlitter(fract8 chanceOfGlitter)
{
  if (random8() < chanceOfGlitter) {
    leds[random16(NUM_LEDS)] += CRGB::White;
  }
}

uint16_t confetti()
{
  // random colored speckles that blink in and fade smoothly
  fadeToBlackBy(leds, NUM_LEDS, 10);
  int pos = random16(NUM_LEDS);
  leds[pos] += ColorFromPalette(palette, gHue + random8(64), 255); // CHSV(gHue + random8(64), 200, 255);
  return 8;
}

uint16_t bpm()
{
  // colored stripes pulsing at a defined Beats-Per-Minute (BPM)
  uint8_t BeatsPerMinute = 62;
  uint8_t beat = beatsin8(BeatsPerMinute, 64, 255);
  for (int i = 0; i < NUM_LEDS; i++) { //9948
    leds[i] = ColorFromPalette(palette, gHue + (i * 2), beat - gHue + (i * 10));
  }
  return 8;
}

uint16_t juggle() {
  // N colored dots, weaving in and out of sync with each other
  fadeToBlackBy(leds, NUM_LEDS, 20);
  byte dothue = 0;
  byte dotCount = 3;
  for (int i = 0; i < dotCount; i++) {
    leds[beatsin16(i + dotCount - 1, 0, NUM_LEDS)] |= CHSV(dothue, 200, 255);
    dothue += 256 / dotCount;
  }
  return 0;
}

// An animation to play while the crowd goes wild after the big performance
uint16_t applause()
{
  static uint16_t lastPixel = 0;
  fadeToBlackBy(leds, NUM_LEDS, 32);
  leds[lastPixel] = CHSV(random8(HUE_BLUE, HUE_PURPLE), 255, 255);
  lastPixel = random16(NUM_LEDS);
  leds[lastPixel] = CRGB::White;
  return 8;
}

// An "animation" to just fade to black.  Useful as the last track
// in a non-looping performance-oriented playlist.
uint16_t fadeToBlack()
{
  fadeToBlackBy(leds, NUM_LEDS, 10);
  return 8;
}

uint16_t sinelon()
{
  // a colored dot sweeping back and forth, with fading trails
  fadeToBlackBy( leds, NUM_LEDS, 20);
  uint16_t pos = beatsin16(13, 0, NUM_LEDS);
  static uint16_t prevpos = 0;
  if ( pos < prevpos ) {
    fill_solid( leds + pos, (prevpos - pos) + 1, CHSV(gHue, 220, 255));
  } else {
    fill_solid( leds + prevpos, (pos - prevpos) + 1, CHSV( gHue, 220, 255));
  }
  prevpos = pos;

  return 8;
}

uint16_t hueCycle() {
  fill_solid(leds, NUM_LEDS, CHSV(gHue, 255, 255));
  return 60;
}

// Pride2015 by Mark Kriegsman
// https://gist.github.com/kriegsman/964de772d64c502760e5

// This function draws rainbows with an ever-changing,
// widely-varying set of parameters.
uint16_t pride()
{
  static uint16_t sPseudotime = 0;
  static uint16_t sLastMillis = 0;
  static uint16_t sHue16 = 0;

  uint8_t sat8 = beatsin88(87, 220, 250);
  uint8_t brightdepth = beatsin88(341, 96, 224);
  uint16_t brightnessthetainc16 = beatsin88(203, (25 * 256), (40 * 256));
  uint8_t msmultiplier = beatsin88(147, 23, 60);

  uint16_t hue16 = sHue16;//gHue * 256;
  uint16_t hueinc16 = beatsin88(113, 1, 3000);

  uint16_t ms = millis();
  uint16_t deltams = ms - sLastMillis;
  sLastMillis = ms;
  sPseudotime += deltams * msmultiplier;
  sHue16 += deltams * beatsin88(400, 5, 9);
  uint16_t brightnesstheta16 = sPseudotime;

  for (int i = 0; i < NUM_LEDS; i++) {
    hue16 += hueinc16;
    uint8_t hue8 = hue16 / 256;

    brightnesstheta16 += brightnessthetainc16;
    uint16_t b16 = sin16(brightnesstheta16) + 32768;

    uint16_t bri16 = (uint32_t) ((uint32_t) b16 * (uint32_t) b16) / 65536;
    uint8_t bri8 = (uint32_t) (((uint32_t) bri16) * brightdepth) / 65536;
    bri8 += (255 - brightdepth);

    CRGB newcolor = CHSV(hue8, sat8, bri8);

    uint8_t pixelnumber = i;
    pixelnumber = (NUM_LEDS - 1) - pixelnumber;

    nblend(leds[pixelnumber], newcolor, 64);
  }

  return 0;
}

///////////////////////////////////////////////////////////////////////

// Forward declarations of an array of cpt-city gradient palettes, and
// a count of how many there are.  The actual color palette definitions
// are at the bottom of this file.
extern const TProgmemRGBGradientPalettePtr gGradientPalettes[];
extern const uint8_t gGradientPaletteCount;

// Current palette number from the 'playlist' of color palettes
uint8_t gCurrentPaletteNumber = 0;

CRGBPalette16 gCurrentPalette( CRGB::Black);
CRGBPalette16 gTargetPalette( gGradientPalettes[0] );

// ten seconds per color palette makes a good demo
// 20-120 is better for deployment
#define SECONDS_PER_PALETTE 10

uint16_t colorWaves()
{
  EVERY_N_SECONDS( SECONDS_PER_PALETTE ) {
    gCurrentPaletteNumber = addmod8( gCurrentPaletteNumber, 1, gGradientPaletteCount);
    gTargetPalette = gGradientPalettes[ gCurrentPaletteNumber ];
  }

  EVERY_N_MILLISECONDS(40) {
    nblendPaletteTowardPalette( gCurrentPalette, gTargetPalette, 16);
  }

  colorwaves( leds, NUM_LEDS, gCurrentPalette);

  return 20;
}


// This function draws color waves with an ever-changing,
// widely-varying set of parameters, using a color palette.
void colorwaves( CRGB* ledarray, uint16_t numleds, CRGBPalette16& palette)
{
  static uint16_t sPseudotime = 0;
  static uint16_t sLastMillis = 0;
  static uint16_t sHue16 = 0;

  // uint8_t sat8 = beatsin88( 87, 220, 250);
  uint8_t brightdepth = beatsin88( 341, 96, 224);
  uint16_t brightnessthetainc16 = beatsin88( 203, (25 * 256), (40 * 256));
  uint8_t msmultiplier = beatsin88(147, 23, 60);

  uint16_t hue16 = sHue16;//gHue * 256;
  uint16_t hueinc16 = beatsin88(113, 300, 1500);

  uint16_t ms = millis();
  uint16_t deltams = ms - sLastMillis ;
  sLastMillis  = ms;
  sPseudotime += deltams * msmultiplier;
  sHue16 += deltams * beatsin88( 400, 5, 9);
  uint16_t brightnesstheta16 = sPseudotime;

  for ( uint16_t i = 0 ; i < numleds; i++) {
    hue16 += hueinc16;
    uint8_t hue8 = hue16 / 256;
    uint16_t h16_128 = hue16 >> 7;
    if ( h16_128 & 0x100) {
      hue8 = 255 - (h16_128 >> 1);
    } else {
      hue8 = h16_128 >> 1;
    }

    brightnesstheta16  += brightnessthetainc16;
    uint16_t b16 = sin16( brightnesstheta16  ) + 32768;

    uint16_t bri16 = (uint32_t)((uint32_t)b16 * (uint32_t)b16) / 65536;
    uint8_t bri8 = (uint32_t)(((uint32_t)bri16) * brightdepth) / 65536;
    bri8 += (255 - brightdepth);

    uint8_t index = hue8;
    //index = triwave8( index);
    index = scale8( index, 240);

    CRGB newcolor = ColorFromPalette( palette, index, bri8);

    uint16_t pixelnumber = i;
    pixelnumber = (numleds - 1) - pixelnumber;

    nblend( ledarray[pixelnumber], newcolor, 128);
  }
}

// Alternate rendering function just scrolls the current palette
// across the defined LED strip.
void palettetest( CRGB* ledarray, uint16_t numleds, const CRGBPalette16& gCurrentPalette)
{
  static uint8_t startindex = 0;
  startindex--;
  fill_palette( ledarray, numleds, startindex, (256 / NUM_LEDS) + 1, gCurrentPalette, 255, LINEARBLEND);
}

#define STARTING_BRIGHTNESS 64
#define FADE_IN_SPEED       32
#define FADE_OUT_SPEED      20
uint8_t DENSITY          = 255;

uint16_t cloudTwinkles()
{
  DENSITY = 255;
  colortwinkles(CloudColors_p);
  return 20;
}

uint16_t rainbowTwinkles()
{
  DENSITY = 255;
  colortwinkles(RainbowColors_p);
  return 20;
}

uint16_t snowTwinkles()
{
  DENSITY = 255;
  colortwinkles(snowColors);
  return 20;
}

uint16_t incandescentTwinkles()
{
  DENSITY = 255;
  colortwinkles(incandescentColors);
  return 20;
}

uint16_t fireflies()
{
  DENSITY = 16;
  colortwinkles(incandescentColors);
  return 20;
}

enum { GETTING_DARKER = 0, GETTING_BRIGHTER = 1 };

void colortwinkles(CRGBPalette16 palette)
{
  // Make each pixel brighter or darker, depending on
  // its 'direction' flag.
  brightenOrDarkenEachPixel( FADE_IN_SPEED, FADE_OUT_SPEED);

  // Now consider adding a new random twinkle
  if ( random8() < DENSITY ) {
    int pos = random16(NUM_LEDS);
    if ( !leds[pos]) {
      leds[pos] = ColorFromPalette( palette, random8(), STARTING_BRIGHTNESS, NOBLEND);
      setPixelDirection(pos, GETTING_BRIGHTER);
    }
  }
}

void brightenOrDarkenEachPixel( fract8 fadeUpAmount, fract8 fadeDownAmount)
{
  for ( uint16_t i = 0; i < NUM_LEDS; i++) {
    if ( getPixelDirection(i) == GETTING_DARKER) {
      // This pixel is getting darker
      leds[i] = makeDarker( leds[i], fadeDownAmount);
    } else {
      // This pixel is getting brighter
      leds[i] = makeBrighter( leds[i], fadeUpAmount);
      // now check to see if we've maxxed out the brightness
      if ( leds[i].r == 255 || leds[i].g == 255 || leds[i].b == 255) {
        // if so, turn around and start getting darker
        setPixelDirection(i, GETTING_DARKER);
      }
    }
  }
}

CRGB makeBrighter( const CRGB& color, fract8 howMuchBrighter)
{
  CRGB incrementalColor = color;
  incrementalColor.nscale8( howMuchBrighter);
  return color + incrementalColor;
}

CRGB makeDarker( const CRGB& color, fract8 howMuchDarker)
{
  CRGB newcolor = color;
  newcolor.nscale8( 255 - howMuchDarker);
  return newcolor;
}

// Compact implementation of
// the directionFlags array, using just one BIT of RAM
// per pixel.  This requires a bunch of bit wrangling,
// but conserves precious RAM.  The cost is a few
// cycles and about 100 bytes of flash program memory.
uint8_t  directionFlags[ (NUM_LEDS + 7) / 8];

bool getPixelDirection( uint16_t i) {
  uint16_t index = i / 8;
  uint8_t  bitNum = i & 0x07;

  uint8_t  andMask = 1 << bitNum;
  return (directionFlags[index] & andMask) != 0;
}

void setPixelDirection( uint16_t i, bool dir) {
  uint16_t index = i / 8;
  uint8_t  bitNum = i & 0x07;

  uint8_t  orMask = 1 << bitNum;
  uint8_t andMask = 255 - orMask;
  uint8_t value = directionFlags[index] & andMask;
  if ( dir ) {
    value += orMask;
  }
  directionFlags[index] = value;
}