#4.1.1.2. 예제

from microbit import *

led_pin = pin0

def fade_in_out(pin, duration):

    half_duration = duration // 2

    for t in range(duration):

        if t < half_duration:

            brightness = (t / half_duration) * 1023

        else:

            brightness = ((duration - t) / half_duration) * 1023

        pin.write_analog(int(brightness))

        sleep(100)

while True:

    fade_in_out(led_pin, 100)