#include <FastLED.h>

#define LED_PIN     3
#define NUM_LEDS    9
#define BRIGHTNESS  64
#define LED_TYPE    WS2811
#define COLOR_ORDER GRB
CRGB leds[NUM_LEDS];

#define UPDATES_PER_SECOND 15





CRGBPalette16 currentPalette;
TBlendType    currentBlending;

extern CRGBPalette16 myGreenBluePalette;
extern const TProgmemPalette16 myGreenBluePalette_p PROGMEM;


void setup() {
    delay( 3000 ); // power-up safety delay
    FastLED.addLeds<LED_TYPE, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS).setCorrection( TypicalLEDStrip );
    FastLED.setBrightness(  BRIGHTNESS );

    currentPalette = ForestColors_p;
    currentBlending = LINEARBLEND;
}


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;
    }
}


// FastLED provides several 'preset' palettes: RainbowColors_p, RainbowStripeColors_p,
// OceanColors_p, CloudColors_p, LavaColors_p, ForestColors_p, and PartyColors_p.


void ChangePalettePeriodically()
{
    uint8_t secondHand = (millis() / 1000) % 60;
    static uint8_t lastSecond = 99;

    if( lastSecond != secondHand) {
        lastSecond = secondHand;

        if( secondHand == 0)  { currentPalette = myGreenBluePalette_p;    currentBlending = NOBLEND;  }
        if( secondHand == 55)  { currentPalette = myGreenBluePalette_p; currentBlending = LINEARBLEND; }
    }
}



// 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 myGreenBluePalette_p PROGMEM =
{
    CRGB::LightCyan,
    CRGB::LightGreen,
    CRGB::Blue,
    CRGB::LightSkyBlue,

    CRGB::Lime,
    CRGB::LimeGreen,
    CRGB::MediumSeaGreen,
    CRGB::MediumTurquoise,

    CRGB::Olive,
    CRGB::PaleGoldenrod,
    CRGB::SpringGreen,
    CRGB::YellowGreen,

    CRGB::Honeydew,
    CRGB::DarkOliveGreen,
    CRGB::Chocolate,
    CRGB::BurlyWood
};