gpio on the Raspberry Pi

Here are some links

installing wiringpi2

http://raspi.tv/how-to-install-wiringpi2-for-python-on-the-raspberry-pi#install

using wiringpi2 for gpio

http://raspi.tv/2013/how-to-use-wiringpi2-for-python-on-the-raspberry-pi-in-raspbian

wiring table (blocked site)


Second part:
http://raspi.tv/2013/how-to-use-wiringpi2-for-python-with-pull-ups-or-pull-downs-and-pwm

Third part:
http://raspi.tv/2013/using-the-mcp23017-port-expander-with-wiringpi2-to-give-you-16-new-gpio-ports-part-3

example from part 1

import wiringpi2 as wiringpi  
from time import sleep       # allows us a time delay  
wiringpi.wiringPiSetupGpio()  
wiringpi.pinMode(24, 1)      # sets GPIO 24 to output  
wiringpi.digitalWrite(24, 0) # sets port 24 to 0 (0V, off)  
  
wiringpi.pinMode(25, 0)      # sets GPIO 25 to input  
try:  
    while True:  
        if wiringpi.digitalRead(25):     # If button on GPIO25 pressed   
            wiringpi.digitalWrite(24, 1) # switch on LED. Sets port 24 to 1 (3V3, on)  
        else:  
            wiringpi.digitalWrite(24, 0) # switch off LED. Sets port 24 to 0 (0V, off)  
        sleep(0.05)                      # delay 0.05s  
  
finally:  # when you CTRL+C exit, we clean up  
    wiringpi.digitalWrite(24, 0) # sets port 24 to 0 (0V, off)  
    wiringpi.pinMode(24, 0)      # sets GPIO 24 back to input Mode  
    # GPIO 25 is already an input, so no need to change anything 


x
Pi hardware info page:

http://elinux.org/RPi_Hardware#Schematic_.2F_Layout


info on the BCM2835 GPIO's

http://elinux.org/RPi_BCM2835_GPIOs

Good website for using GPIO with the RPI

http://wiringpi.com/

Broadcom Arm peripheral spec:
http://www.raspberrypi.org/wp-content/uploads/2012/02/BCM2835-ARM-Peripherals.pdf