【正文】 他是不可見光，因此用他做防盜報警監(jiān)控器，具有良好的隱蔽性，白天黑夜均可使用，而且抗干擾能力強。本設計就是采用 AT89C51單 片機做的防盜報警器。此類裝置不僅能有效的判斷是否有人員闖入監(jiān)控區(qū)，而且還盡可能大地增加防護范圍。 中北大學 2020 屆畢業(yè)設計說 明書 A design Based on SCM Antitheft Alarm System Abstract In our daily life, safety hidden danger he may happen at any moment. The potential safety hazard, it has a sudden, unpredictable, it happened sometimes bring us a devastating blow, even cause the loss of life and property. Because the potential safety hazard is unpredictable, only the security industry, people just to use various tools and equipment to prevent us security events. Therefore, in order to improve our preventive measures, the antitheft alarm system research is very important. This system for low cost, convenient installation, strong antiinterference ability, suitable for most people to use, so the pyroelectric infrared sensor, the signal after monolithic integrated circuit system processing convenient and PC munication, is convenient for uniform management. The design includes the design of hardware and software in two parts. The hardware part prises a singlechip control circuit, infrared probe circuit, driving alarm circuit, an LED control circuit ponents. Processor with 51series single chip AT89C51, the system is in the system operates under software control. Key word: AT89C51 Monolithic integrated circuit, Infrared sensor, Alarm apparatus. 中北大學 2020 屆畢業(yè)設計說明書 第 I 頁 共 Ⅱ頁 目 錄 1 引言 ...................................................................................................................................... 1 選題背景及意義 ............................................................................................................... 1 課 題介紹 ........................................................................................................................... 1 國內外研究現(xiàn)狀 ............................................................................................................... 2 文本主要工作 ................................................................................................................... 2 2 單片機系統(tǒng)的硬件設計 ...................................................................................................... 4 單片機的選擇 ..................................................................................................................... 5 AT89C51 芯片的介紹 ....................................................................................................... 5 結構原理 .......................................................................................................................... 6 8255 的工作方式 .............................................................................................................. 8 AT89C51 與 8255 接口電路 ........................................................................................... 11 單片機與 7488 譯碼驅動器及 LED 的連接 ................................................................... 11 外部地址鎖存器 ............................................................................................................... 12 檢測信號放大電路設計 ................................................................................................... 13 熱釋紅外線傳感器典型電路 ........................................................................................ 13 紅外光敏二極管警燈電路 ............................................................................................ 15 光敏二極管控制電路 ..................................................................................................... 16 紅外線探測信號放大電路設計 ..................................................................................... 16 顯示器工作原理及其選擇 ............................................................................................... 18 液晶顯示和數(shù)碼顯示 .................................................................................................... 19 防盜報警選擇傳感器的選擇 ........................................................................................... 19 3 單片機系統(tǒng)的軟件設計 ...................................................................................................... 20 主程序設計 ....................................................................................................................... 20 核對子程序設計 ............................................................................................................... 21 中斷子程序設計 ............................................................................................................... 21 讀數(shù)子程序設計 ............................................................................................................... 22 程序設計說明 ................................................................................................................... 23 中北大學 2020 屆畢業(yè)設計說明書 第 II 頁 共 Ⅱ頁 4 總結 .................................................................................................................................... 25 附錄 .......................................................................................................................................... 26 參 考 文 獻 ............................................................................................................................ 30 致 謝 ........................................................................................................................................ 31 中北大學 2020 屆畢業(yè)設計說明書 第 1 頁 共 31 頁 1 引言 選題背景 及意義 近年來，隨著改革開放的深入發(fā)展 ，電子技術的日新月異和人類的不斷研究，人民的生活水平的提高和對私有財產(chǎn)安防意識的不斷增強，家庭安全防盜系統(tǒng)的應用日益廣泛。本設計包括硬件和軟件設計兩