from machine import Pin, PWM
from time import sleep

leds = [PWM(Pin(4)), PWM(Pin(6)), PWM(Pin(8)), PWM(Pin(10)), PWM(Pin(12))]
for l in leds:
    l.freq(1000)

while True:
    for l in leds:
        for r in range(0, 65535, 5):
            l.duty_u16(r)
            sleep(0.00001)
    for l in reversed(leds):
        for r in range(65025, 0, -5):
            l.duty_u16(r)
            sleep(0.00001)
    sleep(0.5)