1  # SPDX-FileCopyrightText: 2021 Kattni Rembor for Adafruit Industries
 2  #
 3  # SPDX-License-Identifier: MIT
 4  
 5  """
 6  Blink example for boards with ONLY a NeoPixel LED (e.g. without a built-in red LED).
 7  Includes QT Py and various Trinkeys.
 8  
 9  Requires two libraries from the Adafruit CircuitPython Library Bundle.
10  Download the bundle from circuitpython.org/libraries and copy the
11  following files to your CIRCUITPY/lib folder:
12  * neopixel.mpy
13  * adafruit_pixelbuf.mpy
14  
15  Once the libraries are copied, save this file as code.py to your CIRCUITPY
16  drive to run it.
17  """
18  import time
19  import board
20  import neopixel
21  
22  pixels = neopixel.NeoPixel(board.NEOPIXEL, 1)
23  
24  while True:
25      pixels.fill((255, 0, 0))
26      time.sleep(0.5)
27      pixels.fill((0, 0, 0))
28      time.sleep(0.5)