import _thread
from machine import Pin
from time import sleep_ms, sleep
c=0
cero = Pin(15, Pin.OUT)
uno = Pin(2, Pin.OUT)
dos = Pin(0, Pin.OUT)
tres = Pin(4, Pin.OUT)
cuatro = Pin(5, Pin.OUT)
cinco = Pin(18, Pin.OUT)
seis = Pin(19, Pin.OUT)
siete = Pin(21, Pin.OUT)

leds = [cero, uno, dos, tres, cuatro, cinco, seis, siete]


def derecha():
   while c<=3:
        for i in leds[0:4:1]:
            i.value(1)
            sleep_ms(500)
            i.value(0)
            sleep_ms(500)

def izquierda():
    while c<=3:
        for i in leds[7:3:-1]:
            i.value(1)
            sleep_ms(60)
            i.value(0)
            sleep_ms(60)

try:
    _thread.start_new_thread(derecha, ())  
    _thread.start_new_thread(izquierda, ())  

 
    while True:
        c=c+1
        sleep(1)  

except:
    print("Error")