1  # SPDX-FileCopyrightText: 2021 Kattni Rembor for Adafruit Industries
 2  #
 3  # SPDX-License-Identifier: MIT
 4  
 5  """
 6  NeoPixel example for Pico. Displays a rainbow on the NeoPixels.
 7  
 8  REQUIRED HARDWARE:
 9  * RGB NeoPixel LEDs connected to pin GP0.
10  """
11  import time
12  import board
13  from rainbowio import colorwheel
14  import neopixel
15  
16  # Update this to match the number of NeoPixel LEDs connected to your board.
17  num_pixels = 30
18  
19  pixels = neopixel.NeoPixel(board.GP0, num_pixels, auto_write=False)
20  pixels.brightness = 0.5
21  
22  
23  def rainbow(speed):
24      for j in range(255):
25          for i in range(num_pixels):
26              pixel_index = (i * 256 // num_pixels) + j
27              pixels[i] = colorwheel(pixel_index & 255)
28          pixels.show()
29          time.sleep(speed)
30  
31  
32  while True:
33      rainbow(0)