#from machine import Pin, Timer
#LED= Pin(0,Pin.OUT)

#im= Timer()
#def Flash_LED(timer):
 #   global LED
  #  LED.toggle()
#tim.init(freq=2,mode=Timer.PERIODIC, callback=Flash_LED)

from machine import Pin, Timer
from utime import sleep
led1=Pin(0,Pin.OUT)
led2=Pin(1,Pin.OUT)
led3=Pin(2,Pin.OUT)
led4=Pin(5,Pin.OUT)

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