from machine import Pin, PWM  # type: ignore
import time

Led = PWM(Pin(26))
Led.freq(1000)

while True:
    for i in range(0, 65535, 500):
        Led.duty_u16(i)
        time.sleep(.01)
        print(i)
    time.sleep(1.5)
    for i in range(65535, 0, -500):
        Led.duty_u16(i)
        time.sleep(.01)
        print(i)
    time.sleep(1.5)