import machine
import time
from machine import Pin,PWM

btnRojo = Pin(12,Pin.IN,Pin.PULL_UP)
btnVerde = Pin(13,Pin.IN,Pin.PULL_UP)
btnAmarillo = Pin(14,Pin.IN,Pin.PULL_UP)
pwm = PWM(Pin(2,Pin.OUT))
pwm.freq(50)
while True:
    #0 grados
    if not btnRojo.value():
        pwm.duty(25)
        time.sleep_ms(3)
    #180 grados
    elif not btnVerde.value():
        pwm.duty(125)
        time.sleep_ms(3)
    #90 grados
    elif not btnAmarillo.value():
        pwm.duty(75)
        time.sleep_ms(3)