import machine
import utime

led = machine.PWM(machine.Pin(1))
led1 = machine.PWM(machine.Pin(2))

led.freq(1000)
led1.freq(1000)

for brightness in range(0,65535,50):
    led.duty_u16(brightness)
    utime.sleep_ms(10)
    led1.duty_u16(brightness)
    utime.sleep_ms(10)

led.duty_u16(0)
led1.duty_u16(0)