Photon + NeoPixels

neopixel.ino

/*
 * NeoPixel on Photon
 */

#include "neopixel/neopixel.h"

SYSTEM_MODE(AUTOMATIC);

#define PIXEL_PIN   D2
#define PIXEL_COUNT 10
#define PIXEL_TYPE  WS2812B

Adafruit_NeoPixel strip = Adafruit_NeoPixel(PIXEL_COUNT, PIXEL_PIN, PIXEL_TYPE);


void setup ()
{
    strip.begin();
}

void loop ()
{
    int n;
    
    for (int i = 0; i < PIXEL_COUNT; i++)
    {
        for (int j = 0; j < PIXEL_COUNT; j++)
        {
            n = (i + j) % PIXEL_COUNT;
            switch (j)
            {
                case 0: strip.setPixelColor(n, 127, 0, 0); break;
                case 1: strip.setPixelColor(n, 0, 127, 0); break;
                case 2: strip.setPixelColor(n, 0, 0, 127); break;
                case 3: strip.setPixelColor(n, 127, 127, 0); break;
                case 4: strip.setPixelColor(n, 0, 127, 127); break;
                case 5: strip.setPixelColor(n, 127, 0, 127); break;
                case 6: strip.setPixelColor(n, 127, 127, 127); break;
                case 7: strip.setPixelColor(n, 127, 63, 0); break;
                case 8: strip.setPixelColor(n, 0, 63, 127); break;
                case 9: strip.setPixelColor(n, 63, 0, 127); break;
            }
        }
        strip.show();
        delay(500);
    }
}