import neopixel
from machine import Pin
import time

pixPin=0
pixSize=8
pix=neopixel.NeoPixel(Pin(pixPin),pixSize)

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

while True:
    for i in range(0,pixSize,2):
        pix.fill(green)
        pix[i]=red
        pix.write()
        time.sleep(.2)
    for i in range(pixSize-1,0,-1):
        pix.fill(green)
        pix[i]=red
        pix.write()
        time.sleep(.2)