from machine import Pin
from time import sleep

A1=Pin(5,Pin.OUT)
A2=Pin(4,Pin.OUT)
B1=Pin(2,Pin.OUT)
B2=Pin(15,Pin.OUT)

boton=Pin(13,Pin.IN,Pin.PULL_DOWN)

while(1):
  if boton.value()==0:
    A1.value(1)
    B1.value(1)
    A2.value(0)
    B2.value(0)
    sleep(0.1)

    A1.value(0)
    B1.value(1)
    A2.value(1)
    B2.value(0)
    sleep(0.1)

    A1.value(0)
    B1.value(0)
    A2.value(1)
    B2.value(1)
    sleep(0.1)

    A1.value(1)
    B1.value(0)
    A2.value(0)
    B2.value(1)
    sleep(0.1)

  else:
    A1.value(1)
    B1.value(0)
    A2.value(0)
    B2.value(1)
    sleep(0.1)

    A1.value(0)
    B1.value(0)
    A2.value(1)
    B2.value(1)
    sleep(0.1)

    A1.value(0)
    B1.value(1)
    A2.value(1)
    B2.value(0)
    sleep(0.1)

    A1.value(1)
    B1.value(1)
    A2.value(0)
    B2.value(0)
    sleep(0.1)