from machine import Pin
from time import sleep

# Define GPIO pins for 10 LEDs
led_pins = [2, 4, 5, 18, 19, 21, 22, 23, 25, 26]  # change pins as per your wiring

# Initialize LED objects
leds = [Pin(pin, Pin.OUT) for pin in led_pins]

while True:
    # Forward direction
    for i in range(len(leds)):
        leds[i].on()
        sleep(0.2)
        leds[i].off()
    
    # Reverse direction
    for i in range(len(leds)-1, -1, -1):
        leds[i].on()
        sleep(0.2)
        leds[i].off()