j.ino

# include <FastLED.h>

CRGBPalette16 sweep = CRGBPalette16(
                        CRGB::Blue,
                        CRGB::Green,
                        CRGB::Green,
                        CRGB::Green,
                        CRGB::Green,
                        CRGB::Green,
                        CRGB::Green,
                        CHSV( 90, 255, 255),
                        CHSV( 90, 255, 255),
                        CHSV( 90, 255, 255),
                        CRGB::Yellow,
                        CRGB::Yellow,
                        CRGB::Yellow,
                        CRGB::Yellow,
                        CRGB::Yellow,
                        CRGB::Yellow
                      );

const uint8_t SweepSize = 15;

# define NUM_LEDS    100

CRGB leds[NUM_LEDS];

void setup() {
  FastLED.addLeds<NEOPIXEL, 6>(leds, NUM_LEDS);

  Serial.begin(112500);
}

const CRGB BackgroundColor = CRGB::Red;

void loop() {
  for (int sweepPos = 0; sweepPos < NUM_LEDS; sweepPos++) {

    fill_solid(leds, NUM_LEDS, BackgroundColor);  // wasteful but easy



    for (int i = 0; i < SweepSize; i++) {
      int pos = i + sweepPos; // if(pos > NUM_LEDS){ sweepPos = 0;}
      // if(pos < 0) continue;  // not on the strip yet

      // Serial.println(pos);

      pos += NUM_LEDS;
      leds[pos % NUM_LEDS] = ColorFromPalette(sweep, (255 / SweepSize) * i);
      // set color// past the end of the strip
    }


    for (int i = 0; i < SweepSize; i++) {
      int pos = i + sweepPos + 30; // if(pos > NUM_LEDS){ sweepPos = 0;}
      // if(pos < 0) continue;  // not on the strip yet

      // Serial.println(pos);

      pos += NUM_LEDS;
      leds[pos % NUM_LEDS] = ColorFromPalette(sweep, (255 / SweepSize) * i);
      // set color// past the end of the strip
    }



    FastLED.show();
    FastLED.delay(50);


  }
}