from machine import Pin as pin, PWM as pwm
from time import sleep 

frequencyFirst =1
frequencySecond = 40000000
ledFirst = pwm(pin(14),frequencyFirst)
ledSecond = pwm(pin(16),frequencySecond)

while True:
    for dc in range(0,1024,1):
        ledFirst.duty(dc)
        ledSecond.duty(dc)
        sleep(0.001)

    for dc in range(1023,0,-1):
        ledFirst.duty(dc)
        ledSecond.duty(dc)
        sleep(0.001)