from machine import Pin
from time import sleep

led_pins = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

leds = [Pin(pin, Pin.OUT) for pin in led_pins]

kecepatan = 0.5

while True:
    for led in leds:
        led.high()
        sleep(kecepatan)
        led.low()
    
    for led in reversed(leds):
        led.high()
        sleep(kecepatan)
        led.low()