from machine import Pin
from time import sleep

led1= Pin(1,Pin.OUT)
led2= Pin(2,Pin.OUT)
led3= Pin(3,Pin.OUT)
led4= Pin(4,Pin.OUT)
led5= Pin(5,Pin.OUT)
led6= Pin(6,Pin.OUT)

while True:
    for i in range(1,7,1):
        led = Pin(i,Pin.OUT)
        led.value(1)
        sleep(0.5)
    
    for i in range(6,0,-1):
        led = Pin(i,Pin.OUT)
        led.value(0)
        sleep(0.5)