from machine import Pin , PWM
from time import sleep

led = Pin (4 ,Pin.OUT)
pwm_value = PWM(led,freq = 1000,duty=0)

while True :
    for i in range (0,1023,100): #100 pas d'incrementation de i , bech tet7akem fi durée de progression idha2a 
        pwm_value.duty(i)
        sleep(0.2) 
        print(i)
    for i in reversed( range (0,1023,100)): 
        pwm_value.duty(i)
        sleep(0.2) 
        print(i)