1  # SPDX-FileCopyrightText: 2018 John Edgar Park for Adafruit Industries
 2  #
 3  # SPDX-License-Identifier: MIT
 4  
 5  # Magic 9 Ball
 6  # Turn HalloWing face down and then face up to change images at random
 7  # place 128 x 128 pixel 24-bit .bmp images at root level of HalloWing
 8  
 9  import time
10  import os
11  import random
12  import board
13  import displayio
14  import adafruit_lis3dh
15  
16  splash = displayio.Group()
17  board.DISPLAY.show(splash)
18  
19  SENSITIVITY = 5   # reading in Z direction to trigger, adjustable
20  
21  images = list(filter(lambda x: x.endswith("bmp"), os.listdir("/")))
22  
23  i = random.randint(0, (len(images)-1))  # initial image is randomly selected
24  
25  # Set up accelerometer on I2C bus, 4G range:
26  ACCEL = adafruit_lis3dh.LIS3DH_I2C(board.I2C(), address=0x18)
27  
28  ACCEL.range = adafruit_lis3dh.RANGE_4_G
29  
30  while True:
31      shaken = False
32  
33      print("Image load {}".format(images[i]))
34      # CircuitPython 6 & 7 compatible
35      try:
36          f = open(images[i], "rb")
37          odb = displayio.OnDiskBitmap(f)
38      except ValueError:
39          print("Image unsupported {}".format(images[i]))
40          del images[i]
41          continue
42      face = displayio.TileGrid(odb, pixel_shader=getattr(odb, 'pixel_shader', displayio.ColorConverter()))
43  
44      # # CircuitPython 7+ compatible
45      # try:
46      #     odb = displayio.OnDiskBitmap(images[i])
47      # except ValueError:
48      #     print("Image unsupported {}".format(images[i]))
49      #     del images[i]
50      #     continue
51      # face = displayio.TileGrid(odb, pixel_shader=odb.pixel_shader)
52  
53      splash.append(face)
54      # Wait for the image to load.
55      try:
56          board.DISPLAY.refresh(target_frames_per_second=60)
57      except AttributeError:
58          board.DISPLAY.wait_for_frame()
59  
60      # Fade up the backlight
61      for b in range(101):
62          board.DISPLAY.brightness = b / 100
63          time.sleep(0.01)  # default (0.01)
64  
65      # Wait until the board gets shaken
66      while not shaken:
67          try:
68              ACCEL_Z = ACCEL.acceleration[2]  # Read Z axis acceleration
69          except OSError:
70              pass
71          # print(ACCEL_Z)  # uncomment to see the accelerometer z reading
72          if ACCEL_Z > SENSITIVITY:
73              shaken = True
74  
75      # Fade down the backlight
76      for b in range(100, 0, -1):
77          board.DISPLAY.brightness = b
78          time.sleep(0.005)  # default (0.005)
79  
80      splash.pop()
81  
82      i = random.randint(0, (len(images)-1))  # pick a new random image
83      # print("shaken")
84      faceup = False
85      i %= len(images) - 1