Code for guide "Glowy Message Crown"

Trinket_M0_Message_Crown/README.md

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+## Glowy Message Crown
+
+A guide in the Adafruit Learning system
+
+2021 by Charlyn G for Adafruit Industries
+
+MIT License

Trinket_M0_Message_Crown/code.py

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+# SPDX-FileCopyrightText: 2021 Charlyn Gonda for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+#
+import time
+import board
+from rainbowio import colorwheel
+import neopixel
+
+pixel_pin = board.D4
+num_pixels = 13
+
+pixels = neopixel.NeoPixel(pixel_pin, num_pixels, brightness=0.3,
+                           auto_write=False)
+
+# Lights up the message letter by letter
+def spell(color, wait):
+    for i in range(num_pixels-1, -1, -1):
+        pixels[i] = color
+        time.sleep(wait)
+        pixels.show()
+    time.sleep(0.5)
+
+# Lights up a word, given a startIndex and stopIndex
+def show_word(startIndex, endIndex, color, wait):
+    pixels.fill(OFF)
+    pixels.show()
+    time.sleep(0.1)
+
+    for i in range(startIndex, endIndex-1, -1):
+        pixels[i] = color
+
+    pixels.show()
+    time.sleep(wait)
+
+# Lights up every even-numbered index
+def alternate(color, wait):
+    for i in range(num_pixels):
+        if i % 2 == 0:
+            pixels[i] = color
+        else:
+            pixels[i] = OFF
+    pixels.show()
+    time.sleep(wait)
+
+# Lights up every odd-numbered index
+def alternate_reverse(color, wait):
+    for i in range(num_pixels):
+        if i % 2 == 1:
+            pixels[i] = color
+        else:
+            pixels[i] = OFF
+    pixels.show()
+    time.sleep(wait)
+
+# Full rainbow!
+def rainbow_cycle(wait):
+    for j in range(255):
+        for i in range(num_pixels):
+            rc_index = (i * 256 // num_pixels) + j
+            pixels[i] = colorwheel(rc_index & 255)
+        pixels.show()
+        time.sleep(wait)
+
+RED = (255, 0, 0)
+YELLOW = (255, 150, 0)
+ORANGE = (255, 40, 0)
+GREEN = (0, 255, 0)
+CYAN = (0, 255, 255)
+BLUE = (0, 0, 255)
+PURPLE = (180, 0, 255)
+MAGENTA = (255, 0, 20)
+JADE = (0, 255, 40)
+OFF = (0, 0, 0)
+
+ALT_WAIT = 0.5
+CHASE_WAIT = 0.1
+WORD_WAIT = 1
+
+while True:
+    # indices for "birthday" is from 12 - 5
+    show_word(12, 5, MAGENTA, WORD_WAIT)
+
+    # indices for "boss" is from 4 - 0
+    show_word(4, 0, JADE, WORD_WAIT)
+
+    # again!
+    show_word(12, 5, ORANGE, WORD_WAIT)
+    show_word(4, 0, YELLOW, WORD_WAIT)
+
+    spell(GREEN, CHASE_WAIT)
+    spell(CYAN, CHASE_WAIT)
+    spell(PURPLE, CHASE_WAIT)
+
+    alternate(JADE, ALT_WAIT)
+    alternate_reverse(ORANGE, ALT_WAIT)
+
+    alternate(MAGENTA, ALT_WAIT)
+    alternate_reverse(BLUE, ALT_WAIT)
+
+    alternate(PURPLE, ALT_WAIT)
+    alternate_reverse(GREEN, ALT_WAIT)
+
+    alternate(CYAN, ALT_WAIT)
+    alternate_reverse(MAGENTA, ALT_WAIT)
+
+    rainbow_cycle(0)
+    rainbow_cycle(0)  # higher number, slower rainbow