【正文】 achers to remind conducive to a reasonable arrangement of the teachers and students to school and learning, but also as a reminder of the schedule of the students schedule, so that teachers and students cana law and scientific timing. Therefore, the core part is the clock part of the bell system, the system provides a time reference. This design is mainly for the applicable requirements of the campus bell system, introduced a microcontrollerbased automatic bell system design method, the system controller is AT89S51 SCM , the DS1307 clock chip provide the system with time, and the LCD displayed on the monitor button can set the time interval of the timer rang the bell time and rang the bell. System software design using C language, C language syntax is simple, easy to use, very convenient to be used to plete the software design. This paper presents the design circuit is simple, low cost, and practical. Key words: Rang the bell AT89S51 SCM the DS1307 LCD monitors 河南理工大學(xué)畢業(yè)設(shè)計(jì)（論文）說明書 III 目錄 摘要 ............................................................................................................................................. I Abstract ...................................................................................................................................... II 1 緒論 ........................................................................................................................................ 1 選題目的及意義 ...............................................................................................................1 技術(shù)發(fā)展概況 ...................................................................................................................1 論文內(nèi)容與結(jié)構(gòu) ...............................................................................................................3 2 方案設(shè)計(jì) ................................................................................................................................ 4 方案比較與選擇 ...............................................................................................................4 系統(tǒng)方案選擇 .........................................................................................................4 時(shí)鐘芯片選擇 .........................................................................................................4 顯示器件選擇 .........................................................................................................5 設(shè)計(jì)方案 ..........................................................................................................................5 3 系統(tǒng)硬件設(shè)計(jì) ........................................................................................................................ 7 硬件電路圖 ......................................................................................................................7 時(shí)鐘電路 ..........................................................................................................................7 DS1307 簡介 ............................................................................................................7 時(shí)鐘電路 設(shè)計(jì) .........................................................................................................8 按鍵電路 ..........................................................................................................................8 單片機(jī)電路 ......................................................................................................................9 單片機(jī)簡介 .............................................................................................................9 單片機(jī)最小系統(tǒng)電路 ............................................................................................. 13 顯示電路 ........................................................................................................................ 14 打鈴電路 ........................................................................................................................ 15 4 系統(tǒng)軟件設(shè)計(jì) ...................................................................................................................... 17 軟件設(shè)計(jì)流程圖 ............................................................................................................. 17 讀取 DS1307 時(shí)間程序設(shè)計(jì) ............................................................................................. 18 顯示程序設(shè)計(jì) ................................................................................................................. 19 按鍵設(shè)定程序設(shè)計(jì) .......................................................................................................... 22 5 系統(tǒng)調(diào)試 .............................................................................................................................. 23 元件清單 ........................................................................................................................ 23 調(diào)試過程 ........................................................................................................................ 23 6 總結(jié)與展望 .......................................................................................................................... 26 致謝 .......................................................................................................................................... 27 參考文獻(xiàn) .................................................................................................................................. 28 附錄 .......................................................................................................................................... 29 附錄一：電路圖 ................................................................................................................... 29 附錄二：源程序 ................................................................................................................... 30 河南理工大學(xué)畢業(yè)設(shè)計(jì)（論文）說明書 1 1 緒論 選題目的及意義 隨著現(xiàn)代科技的發(fā)展，管理水 平的完善，具有自動提示功能的打