from machine import Pin, PWM
import utime

led1 = Pin(10, Pin.OUT)
led2 = Pin(11, Pin.OUT)

pwm_led1 = PWM(led1)
pwm_led2 = PWM(led2)

pwm_led1.freq(1000)
pwm_led2.freq(1000)

while True:
    for duty in range (0, 65535, 755):
        pwm_led1.duty_u16(duty)
        pwm_led2.duty_u16(65535-duty)
        utime.sleep_ms(10)
led1.duty_u16(0)
led2.duty_u16(0)