#!/usr/bin/python3

import RPi.GPIO as GPIO
import time
import sys

GPIO.cleanup()
GPIO.setmode(GPIO.BCM)
GPIO.setup(23, GPIO.OUT)

GPIO.output(23, 0)

while True:
    time.sleep(5)
    GPIO.output(23, 1)
    print("on")
    time.sleep(5)
    GPIO.output(23, 0)
    print("off")

GPIO.cleanup()