import time
time.sleep(0.1) 

from machine import Pin
import time

led_pins = [Pin(0, Pin.OUT), Pin(1, Pin.OUT), Pin(2, Pin.OUT), Pin(3, Pin.OUT)]

repeticiones = 10

for _ in range(repeticiones):
    for i in range(4):
        led_pins[i].on()
        time.sleep(1)
        if i > 0:
            led_pins[i-1].off()
    led_pins[3].off()