#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from time import sleep
import RPi.GPIO as GPIO


GPIO.setmode(GPIO.BCM)
pin = 16
GPIO.setup(pin, GPIO.OUT)


def main():
    try:
        while True:
            GPIO.output(pin, GPIO.HIGH)
            sleep(0.5)
            GPIO.output(pin, GPIO.LOW)
            sleep(0.5)
    except:
        GPIO.cleanup()


if __name__ == "__main__":
    main()
    GPIO.cleanup()