dimming internal led - Wokwi ESP32, STM32, Arduino Simulator

from machine import Pin, PWM
led = PWM(Pin(25,Pin.OUT))
led.freq(1_000)
while True:
    for duty in range(0,65_536,5):
        led.duty_u16(duty)
    for duty in range(65_536,0,-5):
        led.duty_u16(duty)