from machine import Pin, PWM
import time

servo=PWM(Pin(13), freq=50)

def mover_servo(angulo):
    min_duty = 40
    max_duty= 115
    duty=int((angulo/180) * (max_duty-min_duty)+ min_duty)
    servo.duty(duty)

while True:
    mover_servo(0)
    time.sleep(1)
    mover_servo(90)
    time.sleep(1)
    mover_servo(180)
    time.sleep(1)
    mover_servo(20)
    time.sleep(1) 

if (valor>0 and valor<1000):
    mover_servo(0)