#include <Adafruit_NeoPixel.h>
int PIN = 12;
int N_LEDS = 40;
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);

    if(i < 10)
    {
      ring.setPixelColor(i,ring.Color(0, 255, 0));
      ring.show();
      delay(500);
    }
    else if(i>=10 && i<20)
    {
      ring.setPixelColor(i,ring.Color(255, 0, 0));
      ring.show();
      delay(500);
    }
    else if(i>=20 && i<30)
    {
      ring.setPixelColor(i,ring.Color(100, 200, 150));
      ring.show();
      delay(500);
    }
    else
    {
      ring.setPixelColor(i,ring.Color(200, 230, 90));
      ring.show();
      delay(500);
    }
  }
}