import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BOARD)
GPIO.setup(11,GPIO.OUT)
GPIO.setup(12,GPIO.OUT)
GPIO.setup(13,GPIO.OUT)
GPIO.setup(15,GPIO.OUT)
GPIO.output(11,0)
GPIO.output(12,0)
GPIO.output(13,0)
GPIO.output(15,0)
for i in range(512):
   GPIO.output(11,1)
   GPIO.output(13,1)
   time.sleep(0.005)
   GPIO.output(11,0)
   GPIO.output(13,0)
   time.sleep(0.005)
   GPIO.output(11,1)
   GPIO.output(15,1)
   time.sleep(0.005)
   GPIO.output(11,0)
   GPIO.output(15,0)
   time.sleep(0.005)
   GPIO.output(12,1)
   GPIO.output(15,1)
   time.sleep(0.005)
   GPIO.output(12,0)
   GPIO.output(15,0)
   time.sleep(0.005)
   GPIO.output(12,1)
   GPIO.output(13,1)
   time.sleep(0.005)
   GPIO.output(12,0)
   GPIO.output(13,0)
   time.sleep(0.005)
GPIO.cleanup()