from machine import Pin
import time
time.sleep(0.1) # Wait for USB to become ready

led1 = Pin(3, Pin.OUT)
led2 = Pin(4, Pin.OUT)
led3 = Pin(5, Pin.OUT)

while True:
  led1.toggle()
  time.sleep(0.1)
  led2.toggle()
  led3.toggle()
  time.sleep(0.5)