from machine import Pin
from neopixel import NeoPixel
import time

Pin = Pin(33,Pin.OUT)
NUM = 16
np=NeoPixel(Pin,NUM)

red=(255,0,0)
green=(0,255,0)
blue=(0,0,255)
black=(0,0,0)

for i in range(16):
    if i % 2==0:
        np[i]=red
        np.write()
        time.sleep(0.5)
    else:
        np[i]=black
        np.write()
for i in range(15,-1,-1):
    np[i]=black
    np.write()
    time.sleep(0.1)