1  # SPDX-FileCopyrightText: 2017 Mikey Sklar for Adafruit Industries
  2  #
  3  # SPDX-License-Identifier: MIT
  4  
  5  # NeoPixie Dust Bag
  6  # learn.adafruit.com/neopixel-pixie-dust-bag
  7  
  8  import time
  9  
 10  import board
 11  import digitalio
 12  import neopixel
 13  
 14  try:
 15      import urandom as random  # for v1.0 API support
 16  except ImportError:
 17      import random
 18  
 19  neo_pin = board.D0  # DIGITAL IO pin for NeoPixel OUTPUT from GEMMA
 20  touch_pin = board.D2  # DIGITAL IO pin for momentary touch sensor to GEMMA
 21  pixel_count = 30  # Number of NeoPixels connected to GEMMA
 22  delay_sec = .010  # delay between blinks, smaller numbers are faster
 23  delay_mult = 8  # Randomization multiplier, delay speed of the effect
 24  
 25  # initialize neopixels
 26  pixels = neopixel.NeoPixel(
 27      neo_pin, pixel_count, brightness=.4, auto_write=False)
 28  
 29  oldstate = False  # counting touch sensor button pushes
 30  showcolor = 0  # color mode for cycling
 31  
 32  # initialize external capacitive touch pad (active high)
 33  button = digitalio.DigitalInOut(touch_pin)
 34  button.direction = digitalio.Direction.INPUT
 35  button.pull = digitalio.Pull.UP
 36  
 37  while True:
 38  
 39      rcolor = 100  # swtich cycles colors, initially GOLD
 40      gcolor = 0
 41      bcolor = 0
 42  
 43      if showcolor == 0:  # Garden PINK
 44          rcolor = 242
 45          gcolor = 90
 46          bcolor = 255
 47  
 48      elif showcolor == 1:  # Pixie GOLD
 49          rcolor = 255
 50          gcolor = 222
 51          bcolor = 30
 52  
 53      elif showcolor == 2:  # Alchemy BLUE
 54          rcolor = 50
 55          gcolor = 255
 56          bcolor = 255
 57  
 58      elif showcolor == 3:  # Animal ORANGE
 59          rcolor = 255
 60          gcolor = 100
 61          bcolor = 0
 62  
 63      elif showcolor == 4:  # Tinker GREEN
 64          rcolor = 0
 65          gcolor = 255
 66          bcolor = 40
 67  
 68      # sparkling
 69      # select a random pixel
 70      p = random.randint(0, (pixel_count - 2))
 71      # color value from momentary switch
 72      pixels[p] = (rcolor, gcolor, bcolor)
 73      pixels.write()
 74  
 75      # delay value randomized to up to delay_mult times longer
 76      time.sleep(delay_sec * random.randint(0, delay_mult))
 77  
 78      # set to a dimmed version of the state color
 79      pixels[p] = (int(rcolor / 10), int(gcolor / 10), int(bcolor / 10))
 80      pixels.write()
 81  
 82      # set a neighbor pixel to an even dimmer value
 83      pixels[p + 1] = (int(rcolor / 15), int(gcolor / 15), int(bcolor / 15))
 84      pixels.write()
 85  
 86      # button check to cycle through color value sets
 87      # get the current button state
 88      newstate = button.value
 89  
 90      # Check if state changed from low to high (button/touchpad press).
 91      if newstate and not oldstate:
 92          # cycle to next color
 93          showcolor += 1
 94  
 95          # limit the cycle to the 5 colors
 96          if showcolor > 4:
 97              showcolor = 0
 98  
 99          # give feedback to the REPL to debug the touch pad
100          # print("Color:", showcolor)
101  
102      # Set the last button state to the old state.
103      oldstate = newstate