from machine import Pin
from utime import sleep

motor=(Pin(15,Pin.OUT),Pin(14,Pin.OUT),Pin(13,Pin.OUT),Pin(12,Pin.OUT))
pattern=((1,0,1,0),(0,1,1,0),(0,1,0,1),(1,0,0,1))
mtr_pos=0
step=30
for i in range(step-2):
    j=mtr_pos
    for k in range(4):
      motor[k].value(pattern[j][k])
    step-=1
    mtr_pos+=1
    if mtr_pos>3:
        mtr_pos=0   
    sleep(0.3)

step=30
for i in range(step+1):
    j=mtr_pos
    for k in range(4):
      motor[k].value(pattern[j][k])
    step-=1
    mtr_pos-=1
    if mtr_pos<0:
        mtr_pos=3  
    sleep(0.3)
      
step=30
for i in range(step+1):
    j=mtr_pos
    for k in range(4):
      motor[k].value(pattern[j][k])
    step-=1
    mtr_pos-=1
    if mtr_pos<0:
        mtr_pos=3  
    sleep(0.3)