from machine import Pin
from neopixel import NeoPixel
from time import sleep
from random import randrange

pixels = NeoPixel(Pin(15), 16)
pixels[0]=(255,0,0)
pixels.write()
sleep(1)
pixels[-1]=(0,255,0)
pixels.write()
sleep(0.5)
pixels[2]=(0,0,255)
pixels.write()
sleep(0.25)
while True: 
  for i in range(16):
    rot = randrange(0,256,10)
    gruen = randrange(0,256,16)
    blau = randrange(0,256,16)
    pixels[i]=[rot,gruen,blau]
  pixels.write()  # in die for-Anweisung einrücken
  sleep(0.1)      #   "           -           "