Ian Scott Johnston has a local only burglar alarm that he would like to be able to interface with remotely. He has hacked in an arduino with a GSM module to allow him to control the system via SMS text messages. The enclosure is large enough to house all of the additional modules that he needed. The built in regulator was a linear style which was swapped out with a switching style to keep the heat down with the additional load. The code isn’t available at this time due to security reasons but I am thinking Ian will release it as soon as he strips out his personal SMS number etc which is probably hard coded in the code.