from machine import *
from utime import sleep_ms

led1 = PWM(Pin(5))
led2 = PWM(Pin(9))

led1.freq(1000)
led2.freq(1000)

for br in range(0,65535,50):
    led1.duty_u16(br)
    sleep_ms(10)
    led2.duty_u16(br)
    sleep_ms(10)

led1.duty_u16(0)
led2.duty_u16(0)