CODE EXAMPLE FOR PYTHON

raspi setup gpio

import RPi.GPIO as GPIO            # import RPi.GPIO module  
from time import sleep             # lets us have a delay  
GPIO.setmode(GPIO.BCM)             # choose BCM or BOARD  
GPIO.setup(24, GPIO.OUT)           # set GPIO24 as an output   

try:  
  while True:  
    GPIO.output(24, 1)         # set GPIO24 to 1/GPIO.HIGH/True  
    sleep(0.5)                 # wait half a second  
    GPIO.output(24, 0)         # set GPIO24 to 0/GPIO.LOW/False  
    sleep(0.5)                 # wait half a second  

    except KeyboardInterrupt:          # trap a CTRL+C keyboard interrupt  
      GPIO.cleanup()                 # resets all GPIO ports used by this program