#!/usr/bin/env python
from time import sleep
import RPi.GPIO as GPIO
i = 0
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(25, GPIO.OUT)
while i<5:
  GPIO.output(25, True)
  sleep(0.5)
  GPIO.output(25, False)
  sleep(900)
  i = i+1