FastLEDNeopixel4Mirrored

// Code adapted only slightly by MiketheChap from example code and documentation for the FastLED library "http://www.fastled.io" 
// FastLED Color Palette Code "https://github.com/FastLED/FastLED/tree/master/examples/ColorPalette"
// I also adapted code from the FastLED "Mirroring Sample"
// That can be found here"https://github.com/FastLED/FastLED/tree/master/examples/Multiple/MirroringSample"
// Essentially, this script mirrors two neopixel strips displaying the color palette in unison. 
// The FastLED creators have left copious notes below. My efforts are to make it easy for Dummies like me to cut and paste. 

// I've updated this in response to a request from my YouTube video. 

#include <FastLED.h>

#define LED_PIN1     4
#define LED_PIN2     5
#define LED_PIN3     6
#define LED_PIN4     7
#define NUM_LEDS    60
#define BRIGHTNESS  64
#define LED_TYPE    WS2812B
#define COLOR_ORDER GRB
CRGB leds[NUM_LEDS];

#define UPDATES_PER_SECOND 100

CRGBPalette16 currentPalette;
TBlendType    currentBlending;

extern CRGBPalette16 myRedWhiteBluePalette;
extern const TProgmemPalette16 myRedWhiteBluePalette_p PROGMEM;



void setup() {
  FastLED.addLeds<LED_TYPE, LED_PIN1, COLOR_ORDER>(leds, NUM_LEDS);
  FastLED.addLeds<LED_TYPE, LED_PIN2, COLOR_ORDER>(leds, NUM_LEDS);
  FastLED.addLeds<LED_TYPE, LED_PIN3, COLOR_ORDER>(leds, NUM_LEDS);
  FastLED.addLeds<LED_TYPE, LED_PIN4, COLOR_ORDER>(leds, NUM_LEDS);
  // Next two lines are for 2 other neopixel strips. -- MiketheChap
  // They are commented out -- MiketheChap
  // FastLED.addLeds<NEOPIXEL, 6>(leds, NUM_LEDS_PER_STRIP);
  // FastLED.addLeds<NEOPIXEL, 7>(leds, NUM_LEDS_PER_STRIP);
  FastLED.setBrightness(   BRIGHTNESS);
  
  currentPalette = RainbowColors_p;
  currentBlending = BLEND;
}

void loop()
{
  ChangePalettePeriodically();

  static uint8_t startIndex = 0;
  startIndex = startIndex + 1; /* motion speed */

  FillLEDsFromPaletteColors( startIndex);

  FastLED.show();
  FastLED.delay(1000 / UPDATES_PER_SECOND);
}

void FillLEDsFromPaletteColors( uint8_t colorIndex)
{
  uint8_t brightness = 255;
  
  for( int i = 0; i < NUM_LEDS; i++) {
    leds[i] = ColorFromPalette( currentPalette, colorIndex, brightness, currentBlending);
    colorIndex += 3;
  }
}




// There are several different palettes of colors demonstrated here.
//
// FastLED provides several 'preset' palettes: RainbowColors_p, RainbowStripeColors_p,
// OceanColors_p, CloudColors_p, LavaColors_p, ForestColors_p, and PartyColors_p.
//
// Additionally, you can manually define your own color palettes, or you can write
// code that creates color palettes on the fly.  All are shown here.

void ChangePalettePeriodically()
{
  uint8_t secondHand = (millis() / 1000) % 60;
  static uint8_t lastSecond = 99;
  
  if( lastSecond != secondHand) {
    lastSecond = secondHand;
    if( secondHand ==  0)  { currentPalette = RainbowColors_p;         currentBlending = BLEND; }
    if( secondHand == 10)  { currentPalette = RainbowStripeColors_p;   currentBlending = NOBLEND;  }
    if( secondHand == 15)  { currentPalette = RainbowStripeColors_p;   currentBlending = BLEND; }
    if( secondHand == 20)  { SetupPurpleAndGreenPalette();             currentBlending = BLEND; }
    if( secondHand == 25)  { SetupTotallyRandomPalette();              currentBlending = BLEND; }
    if( secondHand == 30)  { SetupBlackAndWhiteStripedPalette();       currentBlending = NOBLEND; }
    if( secondHand == 35)  { SetupBlackAndWhiteStripedPalette();       currentBlending = BLEND; }
    if( secondHand == 40)  { currentPalette = CloudColors_p;           currentBlending = BLEND; }
    if( secondHand == 45)  { currentPalette = PartyColors_p;           currentBlending = BLEND; }
    if( secondHand == 50)  { currentPalette = myRedWhiteBluePalette_p; currentBlending = NOBLEND;  }
    if( secondHand == 55)  { currentPalette = myRedWhiteBluePalette_p; currentBlending = BLEND; }
  }
}

// This function fills the palette with totally random colors.
void SetupTotallyRandomPalette()
{
  for( int i = 0; i < 16; i++) {
    currentPalette[i] = CHSV( random8(), 255, random8());
  }
}

// This function sets up a palette of black and white stripes,
// using code.  Since the palette is effectively an array of
// sixteen CRGB colors, the various fill_* functions can be used
// to set them up.
void SetupBlackAndWhiteStripedPalette()
{
  // 'black out' all 16 palette entries...
  fill_solid( currentPalette, 16, CRGB::Black);
  // and set every fourth one to white.
  currentPalette[0] = CRGB::White;
  currentPalette[4] = CRGB::White;
  currentPalette[8] = CRGB::White;
  currentPalette[12] = CRGB::White;

}

// This function sets up a palette of purple and green stripes.
void SetupPurpleAndGreenPalette()
{
  CRGB purple = CHSV( HUE_PURPLE, 255, 255);
  CRGB green  = CHSV( HUE_GREEN, 255, 255);
  CRGB black  = CRGB::Black;
  
  currentPalette = CRGBPalette16( 
    green,  green,  black,  black,
    purple, purple, black,  black,
    green,  green,  black,  black,
    purple, purple, black,  black );
}


// This example shows how to set up a static color palette
// which is stored in PROGMEM (flash), which is almost always more 
// plentiful than RAM.  A static PROGMEM palette like this
// takes up 64 bytes of flash.
const TProgmemPalette16 myRedWhiteBluePalette_p PROGMEM =
{
  CRGB::Red,
  CRGB::Gray, // 'white' is too bright compared to red and blue
  CRGB::Blue,
  CRGB::Black,

  CRGB::Red,
  CRGB::Gray,
  CRGB::Blue,
  CRGB::Black,

  CRGB::Red,
  CRGB::Red,
  CRGB::Gray,
  CRGB::Gray,
  CRGB::Blue,
  CRGB::Blue,
  CRGB::Black,
  CRGB::Black
};



// Additionl notes on FastLED compact palettes:
//
// Normally, in computer graphics, the palette (or "color lookup table")
// has 256 entries, each containing a specific 24-bit RGB color.  You can then
// index into the color palette using a simple 8-bit (one byte) value.
// A 256-entry color palette takes up 768 bytes of RAM, which on Arduino
// is quite possibly "too many" bytes. 
//
// FastLED does offer traditional 256-element palettes, for setups that
// can afford the 768-byte cost in RAM.
//
// However, FastLED also offers a compact alternative.  FastLED offers
// palettes that store 16 distinct entries, but can be accessed AS IF
// they actually have 256 entries; this is accomplished by interpolating
// between the 16 explicit entries to create fifteen intermediate palette 
// entries between each pair.
//
// So for example, if you set the first two explicit entries of a compact 
// palette to Green (0,255,0) and Blue (0,0,255), and then retrieved 
// the first sixteen entries from the virtual palette (of 256), you'd get
// Green, followed by a smooth gradient from green-to-blue, and then Blue.