from utime import sleep
from machine import Pin

dir_pin=Pin(16,Pin.OUT)
step_pin=Pin(17,Pin.OUT)
step_delay=0.01

def move_mtr(dir_p,step):
    dir_pin.value(dir_p)
    for i in range(step):
        step_pin.value(0)
        sleep(step_delay)
        step_pin.value(1)
        sleep(step_delay)

move_mtr(1,200)
move_mtr(0,50)