Add rainbowio simpletest

examples/neopixel_rainbowio_simpletest.py

@@ -0,0 +1,27 @@
+# SPDX-FileCopyrightText: 2022 ladyada for Adafruit Industries
+# SPDX-License-Identifier: MIT
+
+import time
+import board
+from rainbowio import colorwheel
+import neopixel
+
+NUMPIXELS = 12  # Update this to match the number of LEDs.
+SPEED = 0.05  # Increase to slow down the rainbow. Decrease to speed it up.
+BRIGHTNESS = 0.2  # A number between 0.0 and 1.0, where 0.0 is off, and 1.0 is max.
+PIN = board.A3  # This is the default pin on the 5x5 NeoPixel Grid BFF.
+
+pixels = neopixel.NeoPixel(PIN, NUMPIXELS, brightness=BRIGHTNESS, auto_write=False)
+
+
+def rainbow_cycle(wait):
+    for color in range(255):
+        for pixel in range(len(pixels)):  # pylint: disable=consider-using-enumerate
+            pixel_index = (pixel * 256 // len(pixels)) + color * 5
+            pixels[pixel] = colorwheel(pixel_index & 255)
+        pixels.show()
+        time.sleep(wait)
+
+
+while True:
+    rainbow_cycle(SPEED)