Simplify rainbow code

Author: kattni

CircuitPython_Templates/status_led_one_dotstar_rainbow/code.py

@@ -1,7 +1,7 @@
 # SPDX-FileCopyrightText: 2021 Kattni Rembor for Adafruit Industries
 # SPDX-License-Identifier: Unlicense
 """
-CircuitPython DotStar rainbow, brightness control example.
+CircuitPython DotStar red, green, blue, brightness control example.
 """
 import time
 import board
@@ -14,10 +14,7 @@
 
 def rainbow(delay):
     for color_value in range(255):
-        for led in range(1):
-            dot_index = (led * 256 // 1) + color_value
-            dot[led] = colorwheel(dot_index & 255)
-        dot.show()
+        dot[0] = colorwheel(color_value)
         time.sleep(delay)
 
 

CircuitPython_Templates/status_led_one_neopixel_rainbow/code.py

@@ -6,17 +6,13 @@
 from rainbowio import colorwheel
 import neopixel
 
-pixel = neopixel.NeoPixel(board.NEOPIXEL, 1, auto_write=False)
-
+pixel = neopixel.NeoPixel(board.NEOPIXEL, 1)
 pixel.brightness = 0.3
 
 
 def rainbow(delay):
     for color_value in range(255):
-        for led in range(1):
-            pixel_index = (led * 256 // 1) + color_value
-            pixel[led] = colorwheel(pixel_index & 255)
-        pixel.show()
+        pixel[0] = colorwheel(color_value)
         time.sleep(delay)