【正文】 畢業(yè)設(shè)計(jì)用紙 共 頁 第 頁 中文摘要 目前，青少年視力低下已成為國(guó)內(nèi)外共同關(guān)心的問題。資料顯示，我國(guó)小學(xué)生視力低下率為%，初中生 %，高中生 %，大學(xué)生 %。特別是調(diào)查顯示 50%以上的學(xué)生及家長(zhǎng)缺乏視力保健最基本的科普知識(shí)，不懂得不提前預(yù)防和及時(shí)治療近視的危害性，因而有 %視力低下的學(xué)生并未采取任何矯正措施，又缺專業(yè)機(jī)構(gòu)的治療。 基于以上原因，本論文提出了 智能紅外視力保護(hù)儀 的設(shè)計(jì)思路。 智能紅外視力保護(hù)儀 主要包含測(cè)距、感光和定時(shí)三大功能。其中測(cè)距和感光模塊由相應(yīng)功能的傳感器構(gòu)成，能實(shí)現(xiàn)對(duì)使用者距離與 周圍光線強(qiáng)弱的檢測(cè)和報(bào)警功能。 處理 模塊由 STC89C51 單片機(jī)運(yùn)行程序構(gòu)成，能實(shí)現(xiàn)對(duì)學(xué)習(xí)時(shí)間進(jìn)行定時(shí)并通過報(bào)警來提示時(shí)間已到的功能?？傮w上講，本設(shè)計(jì)的這三個(gè)功能能同時(shí)生效，并通過報(bào)警燈閃爍和蜂鳴器報(bào)警的方式提醒使用者注意用眼衛(wèi)生。 本文 通過實(shí)踐證明該視力保護(hù)器可行且可靠性很 好，使用方便。本文期望通過該電子硬件的制作和理論的研究，能為后期進(jìn)一步設(shè)計(jì)多功能視力保護(hù)器并采取合理措施提高視力保護(hù)的有效性提供可靠和有效的數(shù)據(jù)源和信息依據(jù)。 關(guān)鍵詞： 傳感器 ， 測(cè)距 ， 紅外，視力保護(hù) 畢業(yè)設(shè)計(jì)用紙 共 頁 第 頁 ABSTRACT At present, adolescent eyesight has bee the domestic and international issues of mon concern. Data show that China39。s primary vision, low rate of %, % junior high school students, % senior high school students, college students %. Especially the survey shows that 50% more of the students and parents lack of vision care the most basic science knowledge,harmfulness does not know ahead of time is not timely prevention andtreatment of myopia, thus there are % low vision students did not take any corrective measures, treatment and lack of professional anizations. Based on the above reasons, this paper puts forward intelligent infrared vision protection design instrument. Intelligent infraredeyesight protecting instrument mainly includes the location, sensitiveand timing of three functions. The location and the photosensitivesensor module is posed of the corresponding functions, can realize the detection of the user distance and ambient light intensityand alarm function. The processing module is posed ofSTC89C51 microcontroller running the program, can realize time and through the alarm to prompt the time has e for the function oflearning time. Generally speaking, the three function of this designcan in effect at the same time, and through the alarm lights andbuzzer alarm way to remind users to pay attention to eye health. In this paper, through the practice proved the vision protector is feasible and has good reliability, easy to use. In this paper, through the study of the electronic hardware production and theoretical, for the latter part of the further design of multifunction vision protectionand provide the reliable and effective source of data and informationon the basis of improving the effectiveness of vision protection and reasonable measures taken. Keywords: Sensor, ranging, infrared, eyesight protection 畢業(yè)設(shè)計(jì)用紙 共 頁 第 頁 目 錄 第一章 緒論 ....................................................................................................... 5 課題的選題背景 ........................................................................................... 5 國(guó)內(nèi)外發(fā)展現(xiàn)狀 ........................................................................................ 6 本論文主要研究?jī)?nèi)容 ................................................................................ 7 主要內(nèi)容 ............................................................................................. 7 基本要求 .......................................................................................... 7 第二章 智 能視力保護(hù)器總系統(tǒng)設(shè)計(jì) ............................................................. 8 系統(tǒng)總框圖 ................................................................................................ 8 單片機(jī)的選擇 ............................................................................................ 8 傳感器的選 擇 ............................................................................................ 9 編程語言的選擇 ........................................................................................ 9 第三章 系統(tǒng)硬件電路的設(shè)計(jì) ......................................................................... 10 系統(tǒng)硬件總電路構(gòu)成 ................................................................................. 10 單片機(jī)系統(tǒng) ................................................................................................. 10 單片機(jī)引腳介紹 ................................................................................11 單片機(jī)最小系統(tǒng) ............................................................................... 13 顯示系統(tǒng) ..................................................................................................... 14 LED 提示電路 ............................................................................... 14 數(shù)碼管顯示 ....................................................................................... 15 蜂鳴器報(bào)警電路 ......................................................................................... 16 按鍵電路 ..................................................................................................... 17 光敏模塊電路 ............................................................................................. 17 測(cè)距電路 ..................................................................................................... 18 第四章 系統(tǒng)軟件程序的設(shè)計(jì) ......................................................................... 19 Keil C51 軟件平臺(tái) .................................................................................. 20 程序的模塊化劃分 .................................................................................. 21 第五章 結(jié)論及展望 ....................................................................................... 23 參考文獻(xiàn) ........................................................................................................... 24 畢業(yè)設(shè)計(jì)用紙 共 頁 第 頁 附錄 A .............................................................................................................. 25 附錄 B .............................................................................................................. 26 致謝 ...................................................................................................