import machine
import utime
from machine import UART
Serial0 = UART(0, 9600)
Serial1 = UART(1, 9600)                        
led_onboard = machine.Pin(25, machine.Pin.OUT)
led_TX0 = machine.Pin(18, machine.Pin.OUT)
while True:
   led_onboard.value(1)
   led_TX0.value(1)
   utime.sleep(0.5)
   Serial0.write("LED ON")
   Serial1.write("LED ON")
   print("LED ON")
   led_onboard.value(0)
   led_TX0.value(0)
   utime.sleep(0.5)
   Serial0.write("LED OFF")
   Serial1.write("LED OFF")
   print("LED OFF")