from machine import Pin
import time

STEP = Pin(19, Pin.OUT)
DIR = Pin(18, Pin.OUT)
EN = Pin(26, Pin.OUT)

# Habilitar el controlador A4988
EN.value(0)

while True:
    # Giro en un sentido
    DIR.value(1)

    for i in range(200):
        STEP.value(1)
        time.sleep_us(500)
        STEP.value(0)
        time.sleep_us(500)

    time.sleep(1)

    # Giro en sentido contrario
    DIR.value(0)

    for i in range(200):
        STEP.value(1)
        time.sleep_us(500)
        STEP.value(0)
        time.sleep_us(500)

    time.sleep(1)