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)