1  # SPDX-FileCopyrightText: 2018 Anne Barela for Adafruit Industries
 2  #
 3  # SPDX-License-Identifier: MIT
 4  
 5  # Use the 10 NeoPixels on Circuit Playground Express via the
 6  #   Adafruit neopixel library
 7  import time
 8  import neopixel
 9  import board
10  
11  # Set up the 10 Circuit Playground Express NeoPixels half bright
12  CPX_pixels = neopixel.NeoPixel(board.NEOPIXEL, 10, brightness=0.5)
13  
14  # slowly power up via blue color
15  for i in range(50):
16      CPX_pixels.fill((0, 0, i))
17      time.sleep(0.05)
18  
19  # blast off!
20  CPX_pixels.fill((255, 0, 0))
21  
22  while True:
23      # pulse effect
24      for i in range(255, 0, -5):
25          CPX_pixels.fill((i, 0, 0))
26      for i in range(0, 255, 5):
27          CPX_pixels.fill((i, 0, 0))