from machine import Pin, Timer

pins = [15, 18, 27, 13, 21, 25, 5, 19, 22, 12, 14, 26]
leds = [Pin(pin, Pin.OUT) for pin in pins]

timer = Timer(-1)

half_len = len(pins) // 2
led_status = [0] * len(pins)  # 记录每个LED的状态，0表示关闭，1表示亮起

def toggle_led(timer):
    global led_status

    # 交替亮灭LED
    for i in range(len(leds)):
        if i < half_len:
            led_status[i] = not led_status[i]
        else:
            led_status[i] = not led_status[i - half_len]

        if led_status[i]:
            leds[i].on()
        else:
            leds[i].off()

timer.init(period=500, mode=Timer.PERIODIC, callback=toggle_led)