// Marc Miller, Jan 2016

#include "FastLED.h"
#define NUM_LEDS 30
#define dataPin 6

//CRGB leds[NUM_LEDS];  // Not using this.  Using CRGBArray instead.
CRGBArray<NUM_LEDS> leds;

CRGBSet partA(leds(0,7));  // Define custom pixel range with a name.
CRGBSet partB(leds(8,15));  // Define custom pixel range with a name.

CHSV colorOne(0,222,255);  // Define a custom color.
CHSV colorTwo(82,222,255);  // Define a custom color.

//---------------------------------------------------------------
void setup() { 
  FastLED.addLeds<WS2812,dataPin>(leds,NUM_LEDS);
  FastLED.setBrightness(255);
}

//---------------------------------------------------------------
void loop()
{
  uint8_t sinBeat=beatsin8(300,0,NUM_LEDS-1,0,0);
 /* fill_rainbow(leds, NUM_LEDS, millis()/10);  // fill strip with moving rainbow.
  //leds.fadeToBlackBy(230);  // fade the whole strip down some.
  partA = colorOne;  // set partA pixel color.
  partB = colorTwo;  // set partB pixel color.
  */
  leds[sinBeat]=CRGB::LightBlue;
  fadeToBlackBy(leds,NUM_LEDS,110);
  
  FastLED.show();

  EVERY_N_SECONDS(3){  // Swaps the two custom colors every four seconds.
    CHSV temp = colorOne;
    colorOne = colorTwo;
    colorTwo = temp;
  }
}