import board
import neopixel
import time
led = neopixel.NeoPixel(board.D8, 1, brightness=0.3)
while True:
    for k in range (255):
        led[0] = (k, k, 255-k)
        time.sleep(0.02)
    for k in range (255):
        led[0] = (255-k, 255-k, k)
        time.sleep(0.02)