Title: The Design of Automatic Fire Alarm System Based On Wireless Communications Abstract
Whether the ordinary type (such as civilian residential) or the luxury (for example high Guesthouse) high-rise building, put increasing attention on fire prevention and safety technology of universal application. Because of its floors, staff-intensive, if a fire, evacuation difficulties, to fight the blaze also difficult, it is bound to cause serious casualties and property losses. In order to protect high-rise building safety and reliability, it must be designed with high reliability and good real-time automatic fire alarm and fire fighting system. The automatic fire alarm system is discussed which consists of a iron-type smoke detector MC14468, a microcontroller 89C51 and a radio frequency transceiver nRF401. Because of nRF401 being introduced into which adopts the radio communication technology and the FSK technology, the system is improved increasingly in the performances, such as real-time function and high responsibility. And the MC14468 intellectualization simplified the electric circuit, so we don’t need worry about the periphery warning circuit. At the same time ，the MT8888 chip based on telephone alarm can notice timelessly the house master or the related public figure in order that we can reduce the indirect loss. It also used PS7219 this chip to carry on the expansion, which connected 4 LED to show room’s number. It has solved a problem of a scale bigger construction’s room’s number. Considered on the accuracy，This design uses the PS7219 chip to carry on the expansion, which connected 4 LED to show room number and has solved a problem of room number on a scale bigger construction. The system design has the comprehensive a great many functions and both meets the need of function and satisfies the current Technical characteristic.
