from machine import Pin, PWM
import time
pwmb = PWM(Pin(0))
pwmb.freq(1000)
pwmb.duty_u16(0)

pwm0 = PWM(Pin(2))
pwm0.freq(1000)
pwm0.duty_u16(0)

pwm0 = PWM(Pin(1))
pwm0.freq(1000)
pwm0.duty_u16(0)

time.sleep(0.5)
while True :
    for i in range(0, 65535):
        pwm0.duty_u16(i)
        time.sleep_us(100)
    for i in range(66535, 0,-1):
        pwm0.duty_u16(i)
        time.sleep_us(100)
time.sleep(0.5)