Add Rezz goggles CircuitPython code

Rezz_Goggles/rezz.py

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+# pylint: disable=import-error
+
+"""
+NeoPixel goggles inspired by Rezz
+
+No interactive controls; speed, color and directions randomize periodically.
+"""
+
+from random import random, randrange
+from time import monotonic
+import board
+import neopixel
+import adafruit_fancyled.adafruit_fancyled as fancy
+
+# Configurable defaults
+
+BRIGHTNESS = 0.15  # 0.0 (off) to 1.0 (max brightness)
+
+# Global variables
+
+# Declare NeoPixel object. Data from ItsyBitsy pin 5 because it has built-in
+# level shifting. Each LED eye has 44 pixels, so 88 total. Leave brightness
+# at 1.0 here (NeoPixel library runs faster at full brightness) and adjust
+# the global BRIGHTNESS above instead (used later when selecting HSV colors).
+PIXELS = neopixel.NeoPixel(
+    board.D5, 88, auto_write=False, brightness=1.0, pixel_order=neopixel.RGB)
+
+# MODE indicates the current animation state through several bit fields.
+# Bit 0 indicates the second eye is x-axis mirrored (1) or an exact copy
+# of the first (0). Bit 1 indicates hue is slowly cycling (2) vs holding
+# steady (0). Bit 2 indicates the middle of the 3 LED rings moves the
+# opposite (4) or same (0) direction as the other 2.
+MODE = randrange(8)  # 0 to 7
+# Every few seconds, one of the above attributes is randomly toggled.
+# This keeps track of the last time.
+TIME_OF_LAST_MODE_SWITCH = 0
+# HUE works around the color wheel, see FancyLED docs.
+HUE = random()
+# Relative position of MIDDLE of 3 rings, 0 to 143
+MIDDLE_POS = randrange(144)
+# Relative position of INNER and OUTER rings, 0 to 143
+POS = randrange(144)
+# Amount to increment POS and MIDDLE_POS each frame
+SPEED = 2 + random() * 5
+
+# The MIRROR_X and OFFSET(OUTER,MIDDLE,INNER) arrays precompute some values
+# for each pixel so we don't need to repeat that math every frame or LED.
+MIRROR_X = []
+OFFSET_OUTER = []
+OFFSET_MIDDLE = []
+OFFSET_INNER = []
+for i in range(24):
+    MIRROR_X.append(67 - ((i + 11) % 24))
+    OFFSET_OUTER.append(i * 6)
+for i in range(16):
+    MIRROR_X.append(83 - ((i + 7) % 16))
+    OFFSET_MIDDLE.append(i * 9)
+for i in range(4):
+    MIRROR_X.append(87 - ((i + 2) % 4))
+    OFFSET_INNER.append(i * 36)
+
+
+def set_pixel(index, color):
+    """Set one pixel in both eyes. Pass in pixel index (0 to 43) and
+       color (as a packed RGB value). If MODE bit 0 is set, second eye
+       will be X-axis mirrored, else an exact duplicate."""
+    # Set pixel in first eye
+    PIXELS[index] = color
+    # Set pixel in second eye (mirrored or direct)
+    if MODE & 1:
+        PIXELS[MIRROR_X[index]] = color
+    else:
+        PIXELS[44 + index] = color
+
+
+# Main loop, repeat indefinitely...
+while True:
+
+    # Check if 5 seconds have passed since last mode switch
+    NOW = monotonic()
+    if (NOW - TIME_OF_LAST_MODE_SWITCH) > 5:
+        # Yes. Save the time, change ONE mode bit, randomize speed
+        TIME_OF_LAST_MODE_SWITCH = NOW
+        MODE ^= 1 << randrange(3)
+        SPEED = 2 + random() * 5
+
+    # Generate packed RGB value based on current HUE value
+    COLOR = fancy.CHSV(HUE, 1.0, BRIGHTNESS).pack()
+
+    # Draw outer ring; 24 pixels, 8 lit
+    for i in range(24):
+        j = (POS + OFFSET_OUTER[i]) % 72
+        if j < 24:
+            set_pixel(i, COLOR)
+        else:
+            set_pixel(i, 0)
+    # Draw middle ring; 16 pixels, 6 lit
+    for i in range(16):
+        j = (OFFSET_MIDDLE[i] + MIDDLE_POS) % 72
+        if j < 27:
+            set_pixel(24 + i, COLOR)
+        else:
+            set_pixel(24 + i, 0)
+    # Draw inner ring; 4 pixels, 3 lit
+    for i in range(4):
+        j = (POS + OFFSET_INNER[i]) % 144
+        if j < 108:
+            set_pixel(40 + i, COLOR)
+        else:
+            set_pixel(40 + i, 0)
+
+    # Push new state to LEDs
+    PIXELS.show()
+
+    # If MODE bit 1 is set, advance hue (else holds steady)
+    if MODE & 2:
+        HUE += 0.003
+
+    # Increment position of inner & outer ring
+    POS = (POS + SPEED) % 144
+    # Middle ring advances one way or other depending on MODE bit 2
+    if MODE & 4:
+        MIDDLE_POS = (MIDDLE_POS - SPEED) % 144
+    else:
+        MIDDLE_POS = (MIDDLE_POS + SPEED) % 144