from machine import Pin, PWM
import time

servo1=PWM(Pin(16))
servo1.freq(50)         #20 ms el periodo

while True:
    servo1.duty_ns(500000)         #0 grados=0.5 ms =500 us =500 000 ns
    time.sleep_ms(1500)
    servo1.duty_ns(1500000)        #90 grados=1.5 ms=1500 000 ns
    time.sleep_ms(1500)
    servo1.duty_ns(2400000)        #180 grados= 2.5 ms= 2500 000 ns
    time.sleep_ms(1500)