【正文】 thod, 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(jiǎn)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(jiǎn)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(dòng)提示功能的打鈴器能夠?yàn)槠髽I(yè)節(jié)省人力資源，減少開支，對(duì)做到一體化管理具有很大的幫助 。因此，打 鈴系統(tǒng)的核心部分也是時(shí)鐘部分，為系統(tǒng)提供時(shí)間基準(zhǔn)。河南理工大學(xué)畢業(yè)設(shè)計(jì)（論文）說明書 I 摘要 在現(xiàn)如今快節(jié)奏的生活中，人們對(duì)于時(shí)間的要求越來越苛刻，很多時(shí)候都需要對(duì)時(shí)間進(jìn)行規(guī)劃，然后到時(shí)間點(diǎn)就要有時(shí)間提醒，這就必須用到時(shí)鐘提醒裝置，亦可稱為打鈴裝置。打鈴器可以為上下課的學(xué)生和老師們提供時(shí)間提醒，有利于師生對(duì)上課和學(xué)習(xí)的合理安排，同時(shí)，也可作為一個(gè)提醒學(xué)生們作息時(shí)間的時(shí)間表，讓老師和學(xué)生都能有一個(gè)規(guī)律和科學(xué)的時(shí)間安排。本文提出的設(shè)計(jì)方法電路簡(jiǎn)單、成本低廉、實(shí)用性強(qiáng)。目前自動(dòng)打鈴系統(tǒng)的研究和使用已經(jīng)非常普及，之所以選這個(gè)課題就是看在他的成熟性和普遍性。 打鈴器作為一個(gè)提醒人們時(shí)間的設(shè)備，自然離不開提供時(shí)間的系統(tǒng)，最原始的打鈴器是人工根據(jù)時(shí)間通過敲鐘來提醒，隨著技術(shù)的發(fā)展，開始有了機(jī)械時(shí)打鈴器。 基于以上原因，本課題設(shè)計(jì)了一款基于單片機(jī)的自動(dòng)打鈴系統(tǒng)，使用簡(jiǎn)單方便、功能齊全。它是根據(jù)流河南理工大學(xué)畢業(yè)設(shè)計(jì)（論文