I have been receiving requests to build a SMS doorbell from all around the world ever since my SMS doorbel project got featured on hackaday, damnGeeky, hackedgadgets and few other places . My approach is relatively difficult to follow, so I decided to put up some simple steps for you folks to follow and get even better results than my original project. You will need the following components

• A Raspberry Pi, any model will work. I have mine equipped with a WiFi dongle so that I don’t have to worry about Internet cabling
• A wireless doorbell. Any make, any band, just make sure that

1. The base runs on 3V, this is really important so that you avoid complicating things with voltage level shifting. You can easily find out if the base is running on 3V, if it is powered by two AA batteries. 
2. The base has a LED that blinks when the doorbell is activated

sudo apt-get update && sudo apt-get upgrade

sudo apt-get install python-dev
sudo apt-get install python-rpi.gpio

sudo apt-get install apache2 php5 libapache2-mod-php5

sudo service apache2 restart

sudo nano /etc/sudoers
 add to bottom of file:  www-data ALL=(root) NOPASSWD:ALL

First install the apache2 package by typing the following command in to the Terminal:

sudo apt-get install apache2 -y

TEST THE WEB SERVER