1  # SPDX-FileCopyrightText: 2018 Limor Fried for Adafruit Industries
 2  #
 3  # SPDX-License-Identifier: MIT
 4  
 5  import time
 6  
 7  import board
 8  import neopixel
 9  from analogio import AnalogIn
10  
11  pot = AnalogIn(board.A1)  # what pin the pot is on
12  pixpin = board.D0  # what pin the LEDs are on
13  numpix = 16  # number of LEDs in ring!
14  BPP = 4  # required for RGBW ring
15  
16  ring = neopixel.NeoPixel(pixpin, numpix, bpp=BPP, brightness=0.9)
17  
18  
19  def val(pin):
20      # divides voltage (65535) to get a value between 0 and 255
21      return pin.value / 257
22  
23  
24  while True:
25      # Two lines for troubleshooting to see analog value in REPL
26      # print("A0: %f" % (pot.value / 65535 * 3.3))
27      # time.sleep(1)
28  
29      # change floating point value to an int
30      ring.fill((0, 0, 0, int(val(pot))))
31      time.sleep(0.01)