import time
from machine import Pin

led =Pin(18,Pin.OUT)
led1=Pin(12,Pin.OUT)

while True:
    led.value(1)
    time.sleep(0.5)
    led.value(0)
    led1.value(1)
    time.sleep(0.5)
    led1.value(0)
    led.value(1)
    time.sleep(0.5)