#include <Adafruit_NeoPixel.h>
#define PIN       6
#define NUMPIXELS 16

Adafruit_NeoPixel pixels(NUMPIXELS,PIN,NEO_GRB + NEO_KHZ800);

unsigned char R = 0, G = 255, B = 0;

void setup() {
  pixels.begin();
  // put your setup code here, to run once:

}

void loop() {
  for(int shift = 0; shift < NUMPIXELS; shift++){
    for(int j = 0; j < NUMPIXELS; j++){
      if(((j + shift)%NUMPIXELS < 3) || ((j+shift) % NUMPIXELS >= 8 && (j + shift) % NUMPIXELS < 11)){
        pixels.setPixelColor(j,pixels.Color(R,G,B));
      }else{
        pixels.setPixelColor(j,pixels.Color(0,0,0));
      } 
    }
    pixels.show();
    delay(50);

    if (R++ > 254) {
      R = 255;
      if (B++ > 254) {
        B = 255;
        if (G-- < 1) {
          G = 255;
          B = 0;
          R = 0;
        }
      }
    }
  }
  // put your main code here, to run repeatedly:

}