from machine import Pin
from utime import sleep

led1 = Pin(5, Pin.OUT)
led2 = Pin(9, Pin.OUT)
led3 = Pin(13, Pin.OUT)
while True:
  led1.toggle()
  sleep(1)
  led1.toggle()

  led2.toggle()
  sleep(1)
  led2.toggle()

  led3.toggle()
  sleep(1)
  led3.toggle()