from machine import Pin
import time
def blink_led(led, delay=0.5):
    led.on()
    time.sleep(delay)
    led.off()
    time.sleep(delay)
leds = [
    Pin(5, Pin.OUT), Pin(6, Pin.OUT), Pin(10, Pin.OUT),  
    Pin(2, Pin.OUT), Pin(21, Pin.OUT), Pin(7, Pin.OUT),  
    Pin(20, Pin.OUT), Pin(22, Pin.OUT), Pin(19, Pin.OUT), 
    Pin(9, Pin.OUT), Pin(11, Pin.OUT), Pin(18, Pin.OUT)   
]
for led in leds:
    blink_led(led)