from machine import PWM, Pin
import time

pwm = PWM(Pin(21))
pwm1 = PWM(Pin(18))
pwm.freq(1000)
pwm1.freq(1000)

while True:
    for i in range(0, 65025, 100):
        pwm.duty_u16(i)
        print(pwm.duty_u16())
        time.sleep_ms(10)
        pwm.duty_u16(0)
    for i in range(65025, 0, -100):
        pwm1.duty_u16(i)
        print(pwm1.duty_u16())
        time.sleep_ms(10)
        pwm1.duty_u16(0)