#include <Adafruit_NeoPixel.h>
int N_LED = 16;
int din = 12;
Adafruit_NeoPixel ring = Adafruit_NeoPixel(N_LED, din);
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_LED; i++){
    ring.setPixelColor(i, ring.Color(0,0,255));
    ring.show();
    delay(1000);
    if (i<8){
      ring.setPixelColor(i, ring.Color(255,0,0));
      ring.show();
      delay(1000);
    }
    else{
      ring.setPixelColor(i, ring.Color(0,255,0));
      ring.show();
      delay(1000);
    }
  }
}