【正文】 ...... 16 系統(tǒng)軟件調(diào)試 .............................................. 17 PROTEUS 軟件簡介 ........................................... 17 PROTEUS 電路原理圖設(shè)計(jì) ..................................... 18 智能散熱系統(tǒng)的電路原理圖設(shè)計(jì)： ......................... 18 智能散熱核心的電路原理圖設(shè)計(jì)： ......................... 18 PROTEUS 系統(tǒng)仿真與分析 ..................................... 19 結(jié)論 ............................................................ 20 參考文獻(xiàn) ........................................................... 21 致 謝 ............................................................. 22 2 附 錄 ............................................................. 23 源程序代碼 ....................................................... 23 引 言 系統(tǒng)研究背 景 隨著科技 不斷進(jìn)步和發(fā)展， 單片機(jī) 的使用已經(jīng) 滲透到我們 日常 生活 的 各個(gè)領(lǐng)域，導(dǎo)彈的導(dǎo)航裝置，飛機(jī)上各種儀表的控制，計(jì)算機(jī)的網(wǎng)絡(luò)通訊與數(shù)據(jù)傳輸，工業(yè)自動(dòng)化過程的實(shí)時(shí)控制和數(shù)據(jù)處理，各種智能 IC 卡 的 廣泛使用， 轎車 、地鐵和公交車 的安全保障系統(tǒng)， 智能手 機(jī) 、 攝像機(jī) 等，這些 產(chǎn)品都與 開單片機(jī)息息相關(guān) 。在筆記本電腦底部一般都有散熱通風(fēng)口，或吸入或吹出，對筆記本電腦的散熱都非常重要。市場上的散熱底座多數(shù)是有內(nèi)置吸風(fēng)式風(fēng)扇的 。 對于方案一，采用熱敏電阻 雖 有價(jià)格便宜 、 元件易購的優(yōu)點(diǎn)，但 其 對溫度的細(xì)微變化不太敏 感，在信號采集、放大以轉(zhuǎn)換過程中會(huì)產(chǎn)生失真和誤差，并且 熱敏電阻的 RT 關(guān)系是 非線性 的而對溫度的變化存在較大誤差，雖可 通過一定電路來修正，但這不僅 會(huì)使電路變得更 復(fù)雜，而且在人體所處環(huán)境溫度變化過程中難以檢測到小的溫度變化。 AT89C52 單片機(jī)工作 性能高 、電壓低 ，片內(nèi)含 8k 字節(jié)的只讀程序存儲(chǔ)器 ROM 和 512 字節(jié)的隨機(jī)數(shù)據(jù)存儲(chǔ)器RAM，它兼容標(biāo)準(zhǔn)的 MCS51 指令系統(tǒng)，性價(jià)比高，適合本設(shè)計(jì) 的仿真 。達(dá)林頓管串聯(lián)在直流電機(jī)回路上，調(diào)節(jié)電位器改變電機(jī)回路中電流的大小，從而 控制電機(jī)的。此設(shè)計(jì)簡單，成本低，易于實(shí)現(xiàn)。 AT89C52有 40個(gè)引腳， 32個(gè)外部雙向輸入 /輸出（ I/O）端口，同 時(shí)內(nèi)含 2個(gè)外中斷口， 3個(gè) 16位可編程定時(shí)計(jì)數(shù)器 ,2個(gè)全雙工串行通信口， 2 個(gè)讀寫口線，AT89C52可以按照常規(guī)方法進(jìn)行編程，也可以在線編程。 3 個(gè) 16位可編程定時(shí) /計(jì)數(shù)器中斷 低功耗空閑和掉電模式 按結(jié)構(gòu)工藝分：合金管、平面管 。永磁直流電機(jī)既具有結(jié)構(gòu)簡單、 運(yùn)行可靠、維 護(hù)方便等優(yōu)點(diǎn)，又具備良好的調(diào)速特性，現(xiàn)已廣泛應(yīng)用于各種場合。晶振為 。進(jìn)行串行通訊時(shí) 是有 一定條件 的 ，計(jì) 算機(jī)的串口是 RS232 電平的，而單片機(jī)的串口是 TTL 電平的，兩者須有一個(gè)電平轉(zhuǎn)換電路，采 用專用芯片MAX232 進(jìn)行轉(zhuǎn)換，更簡單可靠。本系統(tǒng)的軟件部分主要包括主程序和系統(tǒng)初始化子程序、電機(jī)控制子程序、溫度采集子程序等。 4 查和修改存儲(chǔ)器單元的內(nèi)容。 PROTEUS 電路原理圖設(shè)計(jì) 智能散熱系統(tǒng)的 電路原理圖設(shè)計(jì) ： 圖 15 智能散熱系統(tǒng)的電路原理圖 智能散熱核心的電路原理圖設(shè)計(jì)： 19 圖 16 智能散熱核心的電路原理圖 PROTEUS 系統(tǒng)仿真與分析 （１） 當(dāng)溫度 25? Ｃ t=32? Ｃ 時(shí)，電機(jī)轉(zhuǎn)速較低，如圖： 圖 17 25? Ｃ t=32? Ｃ 時(shí)的仿真電路 （ 2） 當(dāng)溫度 t33? Ｃ 時(shí)，電機(jī)轉(zhuǎn)速加快，如圖： 20 圖 18 t=33? Ｃ 時(shí)的仿真電路 （ 3） 當(dāng)溫度變化時(shí)，溫度數(shù)值變化伴隨的波形變化， 原理圖 如圖 19： 圖 19 溫度數(shù)值變化伴隨的波形變化仿真 結(jié)論 畢業(yè)課題 選擇 時(shí) ， 因 我的散熱器壞了故 對筆 記本散熱問題非常感興趣。我感覺收獲非常大，我們獲得的不僅是理論上的收獲 ,還有實(shí)踐中的豐收。 //DS18B20 數(shù)據(jù)口 sbit dula=P2^6。 void delay_2(uint N) { int i。 i=10。x=148。 delay(25)。 return(DQ)。 for(i=0。 i++) { temp = val i。//定時(shí) 1mS if (count==PWM_ON) { PWM = 1。 for(i=0。 E = 0。 delay_3()。// 顯示關(guān)閉 } * 名稱 : L1602_char(uchar hang,uchar lie,char sign) * 功能 : 改變液晶中某位的值，如果要讓第一行，第五個(gè)字符顯示 b ，調(diào)用該函數(shù)如下 L1602_char(1,5,39。 } * 名稱 : L1602_string(uchar hang,uchar lie,uchar *p) * 功能 : 改變液晶中某位的值，如果要讓第一行，第五個(gè)字符開始顯示 ab cd ef ，調(diào)用該函數(shù)如下 L1602_string(1,5,ab cd ef。) break。 TL0=(655361000)%256。 L1602_string(2,1, dangwei )。 TMPL = read_byte()。 if(temp25amp。s behaviors to care for eyes, basedon the timely and factual statistics the survey series of followup events will also be held in six cities, including Jinan in Shandongprovince, and Changsha in Hunan province, to educate people on how to care for eyes afterthe survey started. More and more Chinese are jogging to get and stay fit. Most joggers will run alone, but some will jog with friends or even coaches. The Beijing Olympic Forest Park is one of the most popular spots. It is packed with runners in the afternoon, usually after work, and at weekends. Jogging after a whole day39。s ovarian function has declined and a bilateral oviduct blockage has occurred, meaning that in vitro fertilization is her only option. So, after reducing her workload, Xiao underwent IVF treatment. Luckily, she got pregnant after just one treatment cycle, but later experienced vaginal bleeding, and rushed to the hospital. I told her to rest and carry on with the treatment (to prevent a miscarriage). As Zubin Zarthoshtimanesh, a yoga guru, demonstrated postures at a high school stadium in Dujiangyan city, Sichuan province, some 200 students sat on colorful mats watching him closely. It was part of the first IndiaChina international yoga festival in the provincial capital, Chengdu, in Southwest China, where more than 1,000 fans from home and abroad gathered for lessons from 20 leading practitioners of the ancient Indian regimen, from June 1721. Yoga is to India what perhaps tai chi is to China. Many countries other than India and China, also held the first World Yoga Day on June 21, after the United Nations last year agreed to Indian Prime Minister Narendra Modi39。s Pink Revolution, an annual campaign that seeks to raise awareness and funds for breast cancer research, the hotel recently announced. A major sponsor of the campaign for three years in a row, Conrad Macao has pledged to donate a portion of its proceeds to the fund, includ ing those collected from selling its popular bear and rubber duck merchandise, in limited pink editions. Pink is the theme for floral arrangements and decorations in the hotel in October. In addition, on Fridays that month, members of the management and staff will add something pink to their uniforms, regular s and handwritten guest cards. Breast cancer is the most prevalent type of cancer among women in Hong Kong and is also of significant concern in Macao and around the world, regardless of age, general manager Bede Barry said in a statement. The hotel has enlisted the 33 support of a number of international and local celebrities to help drive the cause, including South Korean actor Jung Suk Won. This year, a lucky guest who stays at the hotel during the campaign and also donates money for the cause will win a necklace specially designed by Arte Madrid, a Spanish jewelry brand. Women should strive to balance quality of work and life, and have children at a young age. As a doctor I see much suff