3. System Analysis

Analysis part of the system is started after requirements gathering phase. Those requirements were gathered from Questionnaire. Those questionnaires were specially targeted professionals in the computer field and other fields who have well understanding about the computer and who are spending more time away from home. The requirements which have to be analyzed may contain basic personal information and security requirements. Based on those answers number of lights and sensors were decided analysis the lights and sensor architecture. Then analysis type of service that should supply from the mobile home security management system. Form the responses to questionnaire; the most impressive part was lights control and voice communication over the phone with the visitor. Majority were requested to control the main lights around their home and some of them need to control lights in their bed rooms as well. In the market they can find similar systems which are providing a motion, heat, flood detection alert, siren system, and CCTV system and automatically on the lights. 

There are similar system that provides security alarm and home management facility. Most of them were providing to control the 4 lights around the home and detecting the motions via sensors as well as those systems have facilitated the automatic telephone call from security device to allocated number. In this project there will be separate plastic box which uses for the circuit and component easy to quick plug and play with the system in any home. Alternate current may change from 220 voltages to 250 voltages. So those electronic components will be selected to suit for the alternate current and when need to change into direct current transformers will be used in this project. IP camera facility will be available only for home with internet connection and other text message and verbal communication facility can be setup in any home. 

When considering current flow from parallel port to electronic device and electronic device to parallel port, it is required to use resistors, transistors, diodes and relays for protecting parallel port and electronic device. In circuit board may contain following electronic components. There five 470 ohm, 10K ohm resistors, two 330 ohm resistors, five C9013 transistors, five 1N4001 diodes, five 12V relays, and one 5V relay. It is required to have 12 volt and 5 volt for operate the circuit; therefore 12 output power pack and 5 volt output power pack will be used in appropriate places and 12 volt fan will be used to control the generated heat inside the circuit. Then prototype the alarm 12 volte buzzer will be sued in this project. Home security management software may follow standard software development method and object oriented concepts with layered architecture for the establishment for a communication with port and SMS gateway. Verbal communication with visitor will be initiated via mobile phone which is configured inside the home with auto answer facility and that voice will be transmitted to the Bluetooth hand free then sound from the visitor will be transmitted to the inside phone . This project is schedule to complete within one month time with respect to the proposal. Therefore visual studio 2005 uses for the development of the software to read write port and database. Object oriented concept achieve by using the C#.Net programming language. SQL 2005 uses to design and develop the database. Then circuit analysis is completed by checking datasheets of each electronic component. IP camera configuration uses the user manual with the product. Then most essential requirement in development project is, required to follow a standard software development life cycle. So when considering the system inputs and outputs and the nature of the system, Agile software development method called Test Driven Development (TDD) (Ambler, 2011) can be used because this development is the product based development so output is must be accurate in a product otherwise the product will be failed. Another advantage of TDD is final product may contain less errors than the other software development approaches and also It is required to do the software development by testing the output of parallel port from time to time. So TDD is the most suitable software development method for this product based development.