Home security system

my project is all about securing the house. this system not only detentes and notify the user about strainers but also controls the room [login to view URL] the end the device will have a size of 10cmx10cm. this device is designed for this time based on micro controller but for the feature i am planning to change it with FPGA because it have better speed and want to add more functionality like door controlling system(i.e to have some thing like card or TAG to open the door ) and video Surveillance . Bay the way in this project tele surveillance is included,that means it will call to the intended person when an authorized person get into his hos when he is not around. most of the project part is done including the sensor part and micro controller part and tested .the difficult thing is that most of the sensors and other devices are difficult to find. Hopes i forgot one part which is the controlling PC software part. This software will communicate with the micro controller based device and will give the user freedom to change some settings like changing the Telephone number that will be dialed during security alert and also the rotation of the fan as he wishes deviating from the default settings. i thing it is a very big and interesting project.