1  # SPDX-FileCopyrightText: 2021 Kattni Rembor for Adafruit Industries
 2  # SPDX-License-Identifier: MIT
 3  """
 4  CircuitPython NeoPixel Blink example - blinking the built-in NeoPixel(s).
 5  
 6  This example is meant for boards that have built-in NeoPixel LEDs but do not have a little
 7  red LED. If a little red LED is present, use the standard Blink template and example.
 8  
 9  Update NUMBER_OF_PIXELS to the match the number of built-in NeoPixels on the board.
10  
11  DO NOT INCLUDE THE pylint: disable LINE IN THE GUIDE CODE. It is present only to deal with the
12  NUMBER_OF_PIXELS variable being undefined in this pseudo-code. As you will be updating the variable
13  in the guide, you will not need the pylint: disable.
14  
15  For example:
16  If you are using a QT Py, change NUMBER_OF_PIXELS to 1.
17  If using a Neo Trinkey, change NUMBER_OF_PIXELS to 4.
18  """
19  # pylint: disable=undefined-variable
20  
21  import time
22  import board
23  import neopixel
24  
25  pixel = neopixel.NeoPixel(board.NEOPIXEL, NUMBER_OF_PIXELS)
26  
27  while True:
28      pixel.fill((255, 0, 0))
29      time.sleep(0.5)
30      pixel.fill((0, 0, 0))
31      time.sleep(0.5)