import machine, neopixel, urandom, time

PIN = 0          # Data pin -> GP0
NPIX = 8         # Number of NeoPixels
DELAY = 0.2      # Delay between updates

np = neopixel.NeoPixel(machine.Pin(PIN), NPIX)

while True:
    for i in range(NPIX):
        np[i] = (urandom.getrandbits(8),
                 urandom.getrandbits(8),
                 urandom.getrandbits(8))
    np.write()
    time.sleep(DELAY)