#include <Adafruit_NeoPixel.h>
int PIN =12;
int N_LEDS =16;
Adafruit_NeoPixel ring = Adafruit_NeoPixel(N_LEDS, PIN);


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

}

void loop() {
  // put your main code here, to run repeatedly:
  for(int i=0; i<N_LEDS; i++)
  {
    ring.setPixelColor(i, ring.Color(0, 0, 255));
    ring.show();
    delay(500);
  }

}