first commit Magic Nine Ball code

Magic_Nine_Ball/magic_nine_ball.py

@@ -0,0 +1,73 @@
+# Magic 9 Ball
+# Turn HalloWing face down and then face up to change images at random
+# place 128 x 128 pixel 24-bit .bmp images at root level of HalloWing
+
+import time
+import os
+import random
+import board
+import displayio
+import pulseio
+import busio
+import adafruit_lis3dh
+
+backlight = pulseio.PWMOut(board.TFT_BACKLIGHT)
+splash = displayio.Group()
+board.DISPLAY.show(splash)
+
+max_brightness = 2 ** 15
+
+images = list(filter(lambda x: x.endswith("bmp"), os.listdir("/")))
+
+i = random.randint(0, 19)  # initial image is randomly selected
+
+# Set up accelerometer on I2C bus, 4G range:
+I2C = busio.I2C(board.SCL, board.SDA)
+
+ACCEL = adafruit_lis3dh.LIS3DH_I2C(I2C, address=0x18)
+
+ACCEL.range = adafruit_lis3dh.RANGE_4_G
+
+while True:
+    shaken = False
+    with open(images[i], "rb") as f:
+        print("Image load {}".format(images[i]))
+        try:
+            odb = displayio.OnDiskBitmap(f)
+        except ValueError:
+            print("Image unsupported {}".format(images[i]))
+            del images[i]
+            continue
+        face = displayio.Sprite(odb, pixel_shader=displayio.ColorConverter(),
+                                position=(0, 0))
+        splash.append(face)
+        # Wait for the image to load.
+        board.DISPLAY.wait_for_frame()
+
+        # Fade up the backlight
+        for b in range(100):
+            backlight.duty_cycle = b * max_brightness // 100
+            time.sleep(0.01)  # default (0.01)
+
+        # Wait forever
+        while not shaken:
+            try:
+                ACCEL_X, ACCEL_Y, ACCEL_Z = ACCEL.acceleration  # Read the accelerometer
+            except IOError:
+                pass
+            # print(ACCEL_Z)  # uncomment to see the accelerometer z reading
+            if ACCEL_Z > 5:
+                shaken = True
+
+        # Fade down the backlight
+        for b in range(50, -1, -1):
+            backlight.duty_cycle = b * max_brightness // 100
+            time.sleep(0.005)  # default (0.005)
+
+        splash.pop()
+
+        if ACCEL_Z > 5:
+            i = random.randint(0, 19)  # initial image is randomly selected
+            print("shaken")
+            faceup = False
+        i %= len(images) - 1