import time # librería delay
import board # librería placa
import neopixel
led = neopixel.NeoPixel(board.NEOPIXEL, 1) # Seteo de pin y cantidad de LEDs

led.brightness = 0.5 # Brillo de 0 a 1 (1 es 100% y 0.5 es 50%)

while True:
    led[0] = (255, 0, 0) # Valores RGB (R, G, B)
    time.sleep(0.5)
    led[0] = (0, 255, 0)
    time.sleep(0.5)
    led[0] = (0, 0, 255)
    time.sleep(0.5)