#include <Adafruit_NeoPixel.h>
int led_in = 12;
int n_leds = 16;

Adafruit_NeoPixel ring = Adafruit_NeoPixel(n_leds,led_in);
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<=15;i++){
    ring.setPixelColor(i,ring.Color(255,0,0));
    ring.show();
    delay(100);
    
  }
  for(int i = 0;i<=15;i++){
    ring.setPixelColor(i,ring.Color(0,255,0));
    ring.show();
    delay(100);
  }
  for(int i = 0;i<=15;i++){
    ring.setPixelColor(i,ring.Color(0,0,255));
    ring.show();
    delay(100);
  }

}