// This #include statement was automatically added by the Particle IDE.
#include <neopixel.h>

// IMPORTANT: Set pixel COUNT, PIN and TYPE
#define PIXEL_PIN D2
#define PIXEL_COUNT 16
#define PIXEL_TYPE WS2812

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

int pixelNum = 0;

void setup() {

  strip.begin();
  strip.show(); // Initialize all pixels to 'off'
}

void loop() {

  uint16_t i;
  uint32_t blue = strip.Color(0, 0, 255); //blue
  uint32_t off = strip.Color(0, 0, 0); //off
    
    for( int i = 0; i < strip.numPixels(); i++ ){
        if (i != pixelNum) {
            strip.setPixelColor(i, off);
        }
        else {
            strip.setPixelColor(i, blue); // set a color 
            strip.setBrightness(20);
        }
    }
    pixelNum++;
   
    if (pixelNum >= strip.numPixels()) {
            pixelNum = 0;
        }
        
    strip.show();
    delay(100);
    
}