Alarm System Design Based On DTMF Technology

Security is the basic requirements of office and residential functions, along with the development of network technology, the use of the network to achieve alarm system linkage to become an important part of the office and residential security. At present, most alarm systems are chosen for the independent network design, the cost is relatively high in China. Therefore, it is the key to design the alarm system. The DTMF technology is used as the key technology of the system. The system is designed. This shows that the choice of public telephone network using DTMF technology to build the network of the alarm system is feasible, and the low price of our country’s residential and office to promote, there is a certain practical value.Is analyzed in this paper at home and abroad residential security alarm system status, and according to the domestic and foreign development situation and trends, and puts forward a reliable design, operation convenient DTMF technology of intelligent alarm system based on, to meet the people of family security alarm, community center timely alarm of urgent need. Alarm system user machine adopts the emergency button control send the alarming situation, center machine automatic identification calling number, prompt management personnel alarm information and scheduling. The central computer is connected with the computer, which has the function of the database management of the user information, and can be controlled by the DTMF signal.Cell phone alarm system using the existing public telephone network, to overcome the drawbacks of conventional wiring arrangement, the DTMF transceiver MT8880 and DTMF receiver ht9170 as main circuit device, the realization of caller ID and other home alarm information and community management center of information exchange and interaction; ATmega16 microcontroller and ATmega8 respectively as the user machine and machine main control chip; center machine and computer serial communication using the serial communication chip MAX232 circuit design; the handsfree integrated circuit MC34018 user machine with hands-free function, convenient user and alarm calls. In addition, center machine and computer integrated management system network design illustrated Chinese user interface, can realize alarm prompt, alarm query records through the interface, alarm information query and alert the user telephone number the main function. DTMF signal not only has the characteristics of strong anti-interference ability, transmission data far, data accurate, and DTMF signal using public telephone network, save the traditional arrangement and routing tasks, with the advantages of economic benefits, easy and so on. System integration is high, low cost, perfect performance, flexible and diverse functions, can be widely used in residential, hotels, office buildings, warehouses and other important places.