from machine import Pin, PWM
import time

servo_pin = Pin(0)  
servo_pwm = PWM(servo_pin)

servo_pwm.freq(50)

min_duty=3277
max_duty=6554

while True:
    servo_pwm.duty_u16(min_duty) 
    time.sleep(0.5) 

    servo_pwm.duty_u16(max_duty) 
    time.sleep(0.5)