#include "neopixel.h"

#define PIXEL_PIN D2
#define PIXEL_COUNT 16
#define PIXEL_TYPE WS2812
 
Adafruit_NeoPixel strip = Adafruit_NeoPixel(PIXEL_COUNT, PIXEL_PIN, PIXEL_TYPE);



void setup() {

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



void loop() {

  uint16_t i;

  for(i=0; i< strip.numPixels(); i++) {
    strip.setPixelColor(i, 0,0,255 );//blue
    strip.show();
	delay( 1000 );
	strip.setPixelColor(i, 0, 0, 0 );
  }

}