#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<16; i++)
  {
    if(i<4)
    {
      ring.setPixelColor(i, ring.Color(255, 0, 0));
      ring.show();
      delay(500);      
    }
    else if(i>=4 && i<8)
    {
      ring.setPixelColor(i, ring.Color(0, 255, 0));
      ring.show();
      delay(500);  
      
    }
    else if(i>=8 && i<12)
    {
      ring.setPixelColor(i, ring.Color(50, 200, 100));
      ring.show();
      delay(500);      
    }
    else
    {
      ring.setPixelColor(i, ring.Color(0, 0, 225));
      ring.show();
      delay(500);      
    }
  }
}

//1st 8=red, other 8=green