import time
import board
import neopixel

num_pixels = 8

pixels = neopixel.NeoPixel(board.GP0, num_pixels, auto_write=True)
pixels.brightness = 0.5

while True:
    pixels.fill((255,0,0))
    time.sleep(0.5)
    pixels.fill((0,255,0))
    time.sleep(0.5)