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-Controlling NeoPixels
-=====================
-
-NeoPixels, also known as WS2812 LEDs, are full-colour LEDs that are connected in
-serial, are individually addressable, and can have their red, green and blue
-components set between 0 and 255.  They require precise timing to control them
-and there is a special neopixel module to do just this.
-
-To create a NeoPixel object do the following::
-
-    >>> import machine, neopixel
-    >>> np = neopixel.NeoPixel(machine.Pin(4), 8)
-
-This configures a NeoPixel strip on GPIO4 with 8 pixels.  You can adjust the
-"4" (pin number) and the "8" (number of pixel) to suit your set up.
-
-To set the colour of pixels use::
-
-    >>> np[0] = (255, 0, 0) # set to red, full brightness
-    >>> np[1] = (0, 128, 0) # set to green, half brightness
-    >>> np[2] = (0, 0, 64)  # set to blue, quarter brightness
-
-For LEDs with more than 3 colours, such as RGBW pixels or RGBY pixels, the
-NeoPixel class takes a ``bpp`` parameter. To setup a NeoPixel object for an
-RGBW Pixel, do the following::
-
-    >>> import machine, neopixel
-    >>> np = neopixel.NeoPixel(machine.Pin(4), 8, bpp=4)
-
-In a 4-bpp mode, remember to use 4-tuples instead of 3-tuples to set the colour.
-For example to set the first three pixels use::
-
-    >>> np[0] = (255, 0, 0, 128) # Orange in an RGBY Setup
-    >>> np[1] = (0, 255, 0, 128) # Yellow-green in an RGBY Setup
-    >>> np[2] = (0, 0, 255, 128) # Green-blue in an RGBY Setup
-
-Then use the ``write()`` method to output the colours to the LEDs::
-
-    >>> np.write()
-
-The following demo function makes a fancy show on the LEDs::
-
-    import time
-
-    def demo(np):
-        n = np.n
-
-        # cycle
-        for i in range(4 * n):
-            for j in range(n):
-                np[j] = (0, 0, 0)
-            np[i % n] = (255, 255, 255)
-            np.write()
-            time.sleep_ms(25)
-
-        # bounce
-        for i in range(4 * n):
-            for j in range(n):
-                np[j] = (0, 0, 128)
-            if (i // n) % 2 == 0:
-                np[i % n] = (0, 0, 0)
-            else:
-                np[n - 1 - (i % n)] = (0, 0, 0)
-            np.write()
-            time.sleep_ms(60)
-
-        # fade in/out
-        for i in range(0, 4 * 256, 8):
-            for j in range(n):
-                if (i // 256) % 2 == 0:
-                    val = i & 0xff
-                else:
-                    val = 255 - (i & 0xff)
-                np[j] = (val, 0, 0)
-            np.write()
-
-        # clear
-        for i in range(n):
-            np[i] = (0, 0, 0)
-        np.write()
-
-Execute it using::
-
-    >>> demo(np)