import board
import neopixel
from time import sleep 

WAIT = 1
BRIGHTNESS = 0.5
LED_PIN = board.GP0
#LED_PIN = board.GP16

# Update this to match the number of NeoPixel LEDs on your matrix.
MATRIX_WIDTH = 4
MATRIX_HEIGHT = 4

num_pixels = MATRIX_WIDTH * MATRIX_HEIGHT

pixels = neopixel.NeoPixel(LED_PIN, num_pixels, brightness=BRIGHTNESS, auto_write=False)

print('neopixel len:', len(pixels))

while True:
    pixels.fill((255, 0, 0))
    print('red')
    pixels.show()

    sleep(WAIT)

    pixels.fill((0, 255, 0))
    print('green')
    pixels.show()

    sleep(WAIT)

    pixels.fill((0, 0, 255))
    print('blue')
    pixels.show()

    sleep(WAIT)