from machine import Pin
from time import sleep, sleep_us

dir_pin = Pin(12, Pin.OUT)
step_pin = Pin(14, Pin.OUT)

def mover(direcc, pasos, espera, accel):
    dir_pin.value(direcc)
    pasos = abs(pasos)
    for i in range(pasos):
        step_pin.value(1)
        sleep-us(espera)
        step_pin.value(0)
        sleep_us(espera)

def detener():
    step_pin.value(0)

while True:
    mover(1, 200, 2000, 5)
    sleep(1)
    mover(0, 200, 2000, 5)
    sleep(1)