from machine import Pin
from time import sleep_ms
step=Pin(3,Pin.OUT)
dir=Pin(2,Pin.OUT)
step.value(0)
while(1):
  dir.value(1)
  for x in range(200):
   step.value(0)
   step.value(1)
   sleep_ms(5)
  dir.value(0)
  for x in range(200):
   step.value(0)
   step.value(1)
   sleep_ms(2)