from machine import Pin, PWM
from time import sleep_ms

LED = 25 # For ESP32
pin_digital = Pin(LED, mode=Pin.OUT)
pwm_led = PWM(pin_digital) # Attach PWM object on the LED pin

# Settings
pwm_led.freq(1_000) #Hz

while True:
    for duty in range(0,101):
      d_registre = int((duty/100)*1023)
      print("Duty  =", duty, "%", "Duty_registre =", d_registre )
      pwm_led.duty(d_registre) # For ESP32
      sleep_ms(500)