Build a Nanoleaf Replica with Raspberry Pi

import time
import board
import neopixel


# Choose an open pin connected to the Data In of the LED strip, i.e. board.D18
# The LED strip must be connected to D10, D12, D18 or D21 to work.
pixel_pin = board.D18

# The number of LEDs
num_pixels = 9

# The order of the pixel colors - RGB or GRB. Some LEDs have red and green reversed!
# For RGBW LEDs, simply change the ORDER to RGBW or GRBW.
ORDER = neopixel.GRB

pixels = neopixel.NeoPixel(pixel_pin, num_pixels, brightness=1, auto_write=False,
                           pixel_order=ORDER)


def wheel(pos):
    # Input a value 0 to 255 to get a color value.
    # The colours are a transition r - g - b - back to r.
    if pos < 0 or pos > 255:
        r = g = b = 0
    elif pos < 85:
        r = int(pos * 3)
        g = int(255 - pos*3)
        b = 0
    elif pos < 170:
        pos -= 85
        r = int(255 - pos*3)
        g = 0
        b = int(pos*3)
    else:
        pos -= 170
        r = 0
        g = int(pos*3)
        b = int(255 - pos*3)
    return (r, g, b) if ORDER == neopixel.RGB or ORDER == neopixel.GRB else (r, g, b, 0)


def rainbow_cycle(wait):
    for j in range(255):
        for i in range(num_pixels):
            pixel_index = (i * 256 // num_pixels) + j
            pixels[i] = wheel(pixel_index & 255)
        pixels.show()
        time.sleep(wait)


while True:
    # Comment this line out if your LED strips are RGBW/GRBW 
    pixels.fill((255, 0, 0))
    # Uncomment this line if you have RGBW/GRBW LED strips
    # pixels.fill((255, 0, 0, 0))
    pixels.show()
    time.sleep(1)

    # Comment this line out if you have RGBW/GRBW LED strips
    pixels.fill((0, 255, 0))
    # Uncomment this line if you have RGBW/GRBW LED strips
    # pixels.fill((0, 255, 0, 0))
    pixels.show()
    time.sleep(1)

    # Comment this line out if you have RGBW/GRBW LED strips
    pixels.fill((0, 0, 255))
    # Uncomment this line if you have RGBW/GRBW LED strips
    # pixels.fill((0, 0, 255, 0))
    pixels.show()
    time.sleep(1)

    rainbow_cycle(0.001)    # rainbow cycle with 1ms delay per step