from machine import Pin
from time import sleep


while True:
    for i in range(1,6,1):
        led=Pin(i,Pin.OUT)
        led.value(1)
        sleep(0.3)
        led.value(0)

    for i in range(5,0,-1):
        led=Pin(i,Pin.OUT)
        led.value(1)
        sleep(0.3)
        led.value(0)