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    # CircuitPython demo - NeoPixel
    import time
    import board
    import neopixel
     
    pixel_pin = board.IO18
    num_pixels = 1
     
    pixels = neopixel.NeoPixel(pixel_pin, num_pixels, brightness=0.3, auto_write=False)
     
     
    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:
            return (0, 0, 0)
        if pos < 85:
            return (255 - pos * 3, pos * 3, 0)
        if pos < 170:
            pos -= 85
            return (0, 255 - pos * 3, pos * 3)
        pos -= 170
        return (pos * 3, 0, 255 - pos * 3)
     
     
    def color_chase(color, wait):
        for i in range(num_pixels):
            pixels[i] = color
            time.sleep(wait)
            pixels.show()
        time.sleep(0.5)
     
     
    def rainbow_cycle(wait):
        for j in range(255):
            for i in range(num_pixels):
                rc_index = (i * 256 // num_pixels) + j
                pixels[i] = wheel(rc_index & 255)
            pixels.show()
            time.sleep(wait)
     
     
    RED = (255, 0, 0)
    YELLOW = (255, 150, 0)
    GREEN = (0, 255, 0)
    CYAN = (0, 255, 255)
    BLUE = (0, 0, 255)
    PURPLE = (180, 0, 255)
     
    while True:
        pixels.fill(RED)
        pixels.show()
        # Increase or decrease to change the speed of the solid color change.
        time.sleep(1)
        pixels.fill(GREEN)
        pixels.show()
        time.sleep(1)
        pixels.fill(BLUE)
        pixels.show()
        time.sleep(1)
     
        color_chase(RED, 0.1)  # Increase the number to slow down the color chase
        color_chase(YELLOW, 0.1)
        color_chase(GREEN, 0.1)
        color_chase(CYAN, 0.1)
        color_chase(BLUE, 0.1)
        color_chase(PURPLE, 0.1)
     
        rainbow_cycle(0)  # Increase the number to slow down the rainbow