RaspberryPi GPIO demo

blinky.py

#!python
#
# "Hello World!" for RaspberryPi GPIO. Assumes you've correctly connected an LED to pin 5.
#

import RPi.GPIO as gpio
import time

LED_PIN = 5

gpio.setmode(gpio.BOARD)
gpio.setup(LED_PIN, gpio.OUT)

lit = True
while True:
    gpio.output(LED_PIN, lit)
    lit = not lit
    time.sleep(0.5)