from time import sleep
from machine import Pin
from machine import PWM
pwm=PWM(Pin(0))
pwm. freq(50)

def setServoCycle(position):
    pwm.duty_u16(position)
    sleep(0.01)

while True:
    for pos in range(1000,9000,50):
        setServoCycle(pos)
    for pos in range(9000,1000,-50):
        setServoCycle(pos)