from machine import Pin
from time import sleep
led1 = Pin(12, Pin.OUT)
led2 = Pin(14, Pin.OUT)
led3 = Pin(25, Pin.OUT)
led4 = Pin(33, Pin.OUT)


while True:
  led1.value(1)
  sleep(0.5)
  led2.value(1)
  sleep(0.5)
  led3.value(1)
  sleep(0.5)
  led4.value(1)
  sleep(0.5)
  led1.value(0)
  sleep(0.5)
  led2.value(0)
  sleep(0.5)
  led3.value(0)
  sleep(0.5)
  led4.value(0)
  sleep(0.5)