from machine import Pin 
from utime import sleep 
import neopixel 
import random
import time

NUM_LEDS = 16

leds = neopixel. NeoPixel (Pin(15), NUM_LEDS)

ledSet1=int(NUM_LEDS/3)

while True:
    for x1 in range(ledSet1):
        leds[x1+ledSet1+ledSet1]=[0,0,0]
        leds[x1]=[255,7,7]
        leds.write()

    sleep(1)

    for x2 in range(ledSet1):
        leds[x2]=[0,0,0]
        leds[x2+ledSet1]=[7,255,7]
        leds.write()

    sleep(1)

    for x3 in range(ledSet1):
        leds[x3+ledSet1]=[0,0,0]
        leds[x3+ledSet1+ledSet1]=[7,7,255]
        leds.write()

    sleep(1)