from machine import Pin
from time import sleep 
led1 = Pin(15,Pin.OUT)
led2 = Pin(2,Pin.OUT)
led3 = Pin(0,Pin.OUT)
while True:
  led1.value(1)
  led2.value(0)
  led3.value(0)
  sleep(1)
  led1.value(0)
  led2.value(1)
  led3.value(0)
  sleep(1)
  led1.value(0)
  led2.value(0)
  led3.value(1)
  sleep(1)