#include <FastLED.h>

//  Relaxing Slow and Smooth scrolling christmas colors to hang in my tree

#define LED_PIN     5
#define NUM_LEDS    60
#define BRIGHTNESS 128
CRGB leds[NUM_LEDS];

static const byte hue_arr[6]= {0,64,96,0,64,96};
static const byte sat_arr[6]= {255,150,255,255,150,255};

word w;

void setup() {
  delay( 3000 ); // power-up safety delay
  FastLED.addLeds<NEOPIXEL,LED_PIN>(leds, NUM_LEDS);
  FastLED.setBrightness(BRIGHTNESS);
  FastLED.setDither(0); // flickers if adding a lot of leds
}

void loop() {
  EVERY_N_MILLIS(10) {
    FastLED.show();
  }
  EVERY_N_MILLIS(10) {
    w++;
    if (w>768) w=0;
    byte p=0;
    for(byte i=0;i<NUM_LEDS;i++) {
      p++;
      if (p>23) p=0;
      leds[i]=CHSV(hue_arr[((w>>5)+p)>>3],sat_arr[((w>>5)+p)>>3],sin8((i<<5)+w-32));
      leds[i]+=leds[i];
    }
  }
}