主从式报警系统毕业论文.doc

摘 要 上世纪八十年代以来，计算机、信息、电子、控制、通信等技术得到迅速发展，电子报警Abstract Since the 1980s, computer, information, electronics, control, communications and other technologies have developed rapidly, the electronic alarm system is also more and more types to meet peoples needs, the paper designed by the alarm system is applicable to the company Or factories and other places. This paper is AT89C51 microcontroller as the core, the main design, from the collaboration alarm system. Applied to the other major chip has 8255, DS12887, MT8888, and so on. First, from the design of the circuit of information collection, will collect the information sent to the interface 5288, and transmitted to the main controller AT89C51, all of the system with an integrated switch-alarm sensors, alarm sensor output are all only two states: disconnect When the normal working condition; closed at the police state. This device for a time as the base of the master-slave automatic alarm system. The entire device in the unit during normal working hours, in time chip (DS12887) under the command to stop work; In non-working hours, as class time, holidays such as restoration of normal work. If encounter Special circumstances be conducted through the keyboard settings. When the host detected alarm information (monitoring points was the normal work of the non-state), the normal work under the circumstances to send alarm information from the machine in the stop working under the PWC will not ignore. For the extension of anti-interference and signal transmission distance, DTMF application of technology for long-range double-communications, multi-user can achieve a joint collaboration alarm function. From the machine to receive warning information, received a report of information after the alarm is given instructions (ring tones, light).  Key words: AT89C51, master-slave alarm system, DTMF communications 第一章 绪论 1 1.1 研究背景 1 1.2 研究意义 1 1.3 电子防盗报警系统主要功能介绍 2 第二章 方案论证 6 2.1核心器件单片机的发展 6 2.2设计要求 7 2.3 主要芯片介绍 8 2.3.1. 8255芯