import time
from machine import Pin, PWM

time.sleep(0.1) # Wait for USB to become ready

servo1 = PWM(Pin(22))
servo1.freq(50)

while True:
    for pulso in range (500000,2500000,1000)
         servo1.duty_ns(pulso)
         time.sleep_ms(1)

    for pulso in range (500000,2500000,1000)
         servo1.duty_ns(pulso)
         time.sleep_ms(1)