from machine import Pin
from utime import sleep

externalLED = Pin(5, Pin.OUT)
onBoardLED =  Pin(25, Pin.OUT)

while True:
    externalLED.value(1)
    onBoardLED.value(1)
    sleep(5)
    externalLED.value(0)
    onBoardLED.value(0)
    sleep(5)