1  # SPDX-FileCopyrightText: 2021 Kattni Rembor for Adafruit Industries
 2  # SPDX-License-Identifier: MIT
 3  """CircuitPython Digital Input example - Blinking a built-in NeoPixel LED using a button switch.
 4  
 5  Update BUTTON_PIN to the pin to which you have connected the button (in the case of an external
 6  button), or to the pin connected to the built-in button (in the case of boards with built-in
 7  buttons).
 8  
 9  For example:
10  If you connected a button switch to D1, change BUTTON_PIN to D1.
11  If using a QT Py RP2040, to use button A, change BUTTON_PIN to BUTTON.
12  """
13  import board
14  import digitalio
15  import neopixel
16  
17  pixel = neopixel.NeoPixel(board.NEOPIXEL, 1)
18  
19  button = digitalio.DigitalInOut(board.BUTTON_PIN)
20  button.switch_to_input(pull=digitalio.Pull.UP)
21  
22  while True:
23      if not button.value:
24          pixel.fill((255, 0, 0))
25      else:
26          pixel.fill((0, 0, 0))