| Nowadays, with rapidly changing and technology advances, the quality of life step by step improve the life and property safety of growing concern. Along with the constant rapid growth of Chinese economy and the increasingly acceleration of Chinese urbanization process, thousands of tall buildings are built every year, as well as more villas and luxury houses. However, people living and working in tall buildings begin losing their sense of safety for the fact that it is difficult for them to escape and to be rescued should disaster take place in such environment. And if a disaster like fire arises in a villa or luxury house, it would cause great losses. Although there are many emergency communication system in the market now, these systems are difficult to achieve accurate and timely to the relevant personnel when in the event of an emergency, while in many cases, the information is needed to transmit by manual work, so this situation has led to a waste of time, increases the loss. Moreover, the general emergency communications systems are subject to many conditions, especially the cable restrictions, and many systems require specialized to pull a line to achieve the function of the transmission of information. The wired communications systems are vulnerable to damage, and a lot of residential buildings and business centers are centrally located wiring box, if the criminals first to open the wiring box to the cable destruction, the system can not work.The thesis uses the GSM wireless network transmission medium as an information communication system. Comparing with the traditional transmission medium, this medium is more secure and stable, wide coverage, and also save the costs of set up a dedicated line, but not the maintenance of the latter line. This system is in the use of embedded processors through AT commands to control a GSM module, and take the GSM network for voice calls and short message to the corresponding function. The peripheral circuit of the GSM module is designed and a run with a good user experience is designed by QT interface application. When an emergency occurs, the user via the touch screen to click an icon that you can quickly pass information to the appropriate personnel phone or information center and get relief in a timely manner, to reduce the losses to a minimum. The overall system design and detailed design is completed. The entire system includes hardware included power, boot signals and phone calls to remind, serial communication, SIM card module, and software modules, including dial-up module, short message module, contacts module, the log module, inbound and outbound modules, dual-tone multi-frequency module. Hardware gives the corresponding logic circuit diagrams, and software process design of these functional modules.Finally, this thesis has summarized the topic research, proposed the topic related deficiency, and has carried on the forecast to the future. |
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