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<h2>新聞中心</h2> </div> <div id="d0zn6f0" class="hLocation"> <p><a href="http://dyxdggzs.com" target="_blank">EEPW首頁(yè)</a> > <a href="/info/industry/special/network">網(wǎng)絡(luò )與存儲</a> > <a href="/info/articlelist/special/network/type/5">設計應用</a> > 大牛談?dòng)布娮庸こ處煴貍浼寄?，你掌握了嗎?/p> </div> </div> </div>    <div class="qqmiia9" id="container"> <section> <article> <h1>大牛談?dòng)布娮庸こ處煴貍浼寄?，你掌握了嗎?/h1> <div id="9b9uzri" class="authorTimeSource"> <span>作者：</span> <span>時(shí)間：2017-10-27</span> <span>來(lái)源：網(wǎng)絡(luò )</span> <link rel="stylesheet" type="text/css"/> <span style="float:right; width:130px;margin-right:0px; text-align:right;"> <div id="ulpcybm" class="nav0"> <ul> <li><a href="javascript:void(0);"><img src="http://dyxdggzs.com/event/action/images/icon_add_4.png" width="20" border="0" align="absmiddle" />加入技術(shù)交流群</a> <ul> <li style="text-align:center;"><img src="http://dyxdggzs.com/event/company/images/code_1.jpg" width="130"><br />掃碼加入<br />和技術(shù)大咖面對面交流<br />海量資料庫查詢(xún)</li> </ul> </li> </ul> </div> </span> <span style="float:right; width:30px;margin-right:0px; text-align:right;"><a rel="nofollow">收藏</a></span> </div> <div id="gootlyp" class="hAd4_Afinal20a_back">  <iframe id='a890e388' name='a890e388' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='660' height='60'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE&n=a635e61e' border='0' alt='' /></a></iframe> </div> <div style="margin-top:28px;"></div> <div id="0jnrwxl" class="content" id="contentDiv" style="position:relative;"> <div id="ktl9zm1" class="ad_300x180_Afinal13_back">  <iframe id='a225770a' name='a225770a' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='300' height='200'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE&n=a576c0a2' border='0' alt='' /></a></iframe> </div> <span id="contentlabels" style="font-size:14px;"><p><strong>　　第一部分：硬件知識</strong></p>本文引用地址：<a href="http://dyxdggzs.com/article/201710/368907.htm">http://dyxdggzs.com/article/201710/368907.htm</a><p><strong>　　一、數字信號</strong></p><p>　　1、TTL和帶緩沖的TTL信號：邏輯門(mén)電路</p><p>　　2、RS232和定義：異步傳輸標準接口，通常以9個(gè)引腳（DB-9）或是25個(gè)引腳（DB-25）的型態(tài)出現，一般個(gè)人計算機上會(huì )有兩組RS-232接口，分別稱(chēng)為COM1和COM2。數據傳輸速率為每秒50、75、100、150、300、600、1200、2400、4800、9600、19200波特。</p><p>　　3、RS485/422（平衡信號）半雙工/全雙工</p><p>　　4、干接點(diǎn)信號：無(wú)源開(kāi)關(guān)，具有閉合和斷開(kāi)的2種狀態(tài)，2個(gè)接點(diǎn)之間沒(méi)有極性，可以互換。各種開(kāi)關(guān)如：限位開(kāi)關(guān)、行程開(kāi)關(guān)、腳踏開(kāi)關(guān)、旋轉開(kāi)關(guān)、溫度開(kāi)關(guān)、液位開(kāi)關(guān)等；各種按鍵；各種傳感器的輸出，如：環(huán)境動(dòng)力監控中的傳感器、水浸傳感器、火災報警傳感器、玻璃破碎、振動(dòng)、煙霧和凝結傳感器；繼電器、干簧管的輸出。</p><p>　　濕接點(diǎn)信號：有源開(kāi)關(guān)；具有有電和無(wú)電的2種狀態(tài)；2個(gè)接點(diǎn)之間有極性，不能反接。</p><p><strong>　　二、模擬信號視頻</strong></p><p>　　1、非平衡信號：非平穩信號是指分布參數或者分布律隨時(shí)間發(fā)生變化的信號?，F實(shí)世界中我們所碰到的信號大都是非平穩信號。平穩和非平穩都是針對隨機信號說(shuō)的，非平穩信號分析和處理的一般方法有時(shí)域分析、頻域分析、時(shí)頻聯(lián)合分析。</p><p>　　2、平衡信號：信號在傳輸過(guò)程中，如果被直接傳送就是非平衡信號，如果把信號反相，然后同時(shí)傳送反相的信號和原始信號，就叫做平衡信號，平衡信號送入差動(dòng)放大器，原信號和反相位信號相減，得到加強的原始信號，由于在傳送中，兩條線(xiàn)路受到的干擾差不多，在相減的過(guò)程中，減掉了一樣的干擾信號，因此更加抗干擾。這種在平衡式信號線(xiàn)中抑制兩極導線(xiàn)中所共同有的噪聲的現象便稱(chēng)為共模抑制。所以平衡線(xiàn)路只需要在輸入輸出信號增加一個(gè)差動(dòng)放大器就可以實(shí)現。</p><p><strong>　　三、芯片</strong></p><p>　　1、封裝</p><p>　　2、7407：TTL集電極開(kāi)路六正相高壓驅動(dòng)器。1入2出3進(jìn)4輸出5進(jìn)6輸出9進(jìn)8輸出11進(jìn)10輸出13進(jìn)12輸出。</p><p>　　3、7404：六組反向器。1入2出3進(jìn)4輸出5進(jìn)6輸出9進(jìn)8輸出11進(jìn)10輸出13進(jìn)12輸出。</p><p>　　4、7400：四組與門(mén)。1.2入3出，4.5入6出，9.10入8出，12.13入11出。</p><p>　　5、74LS573：八位三狀態(tài)輸出D觸發(fā)器。</p><p>　　6、ULN2003：高耐壓、大電流達林頓陳列，由七個(gè)硅NPN達林頓管組成。</p><p>　　7、74LS244：3態(tài)8位緩沖器，一般用作總線(xiàn)驅動(dòng)器，沒(méi)有鎖存的功能。</p><p>　　8、74LS240：3態(tài)總線(xiàn)轉換器，一般用于總線(xiàn)的電平匹配問(wèn)題，為單向傳送。</p><p>　　9、74LS245：3態(tài)總線(xiàn)轉換器，一般用于總線(xiàn)的電平匹配問(wèn)題，為雙向傳送。</p><p>　　10、74LS138：3線(xiàn)-8線(xiàn)譯碼器</p><p>　　74LS238：加法器</p><p>　　11、CPLD（EPM7128）</p><p>　　12、1161</p><p>　　13、max691</p><p>　　14、max485/75176</p><p>　　15、mc1489</p><p>　　16、mc1488</p><p>　　17、ICL232/max232</p><p>　　18、89C51</p><p>　　四、分立器件</p><p>　　1、封裝</p><p>　　2、電阻：功耗和容值</p><p>　　3、電容</p><p>　　1）獨石電容</p><p>　　2）瓷片電容</p><p>　　3）電解電容</p><p>　　4、電感</p><p>　　5、電源轉換模塊</p><p>　　6、接線(xiàn)端子</p><p>　　7、LED發(fā)光管</p><p>　　8、8字（共陽(yáng)和共陰）</p><p>　　9、三極管2N5551</p><p>　　10、蜂鳴器</p><p><strong>　　五、單片機最小系統</strong></p><p>　　1、單片機</p><p>　　2、看門(mén)狗和上電復位電路</p><p>　　3、晶振和瓷片電容</p><p>　　六、串行接口芯片</p><p>　　1、eeprom</p><p>　　2、串行I/O接口芯片</p><p>　　3、串行AD、DA</p><p>　　4、串行LED驅動(dòng)、max7129</p><p>　　七、電源設計</p><p>　　1、開(kāi)關(guān)電源：器件的選擇</p><p>　　2、線(xiàn)性電源：</p><p>　　1）變壓器</p><p>　　2）橋</p><p>　　3）電解電容</p><p>　　3、電源的保護</p><p>　　1）橋的保護</p><p>　　2）單二極管保護</p><p>　　八、維修</p><p>　　1、電源</p><p>　　2、看門(mén)狗</p><p>　　3、信號</p><p>　　九、設計思路</p><p>　　1、電源：電壓和電流</p><p>　　2、接口：串口、開(kāi)關(guān)量輸入、開(kāi)關(guān)量輸出</p><p>　　3、開(kāi)關(guān)量信號輸出調理</p><p>　　1）TTL―》繼電器</p><p>　　2）TTL―》繼電器（反向邏輯）</p><p>　　3）TTL―》固態(tài)繼電器</p><p>　　4）TTL―》LED（8字）</p><p>　　5）繼電器―》繼電器</p><p>　　6）繼電器―》固態(tài)繼電器</p><p>　　4、開(kāi)關(guān)量信號輸入調理</p><p>　　1）干接點(diǎn)―》光耦</p><p>　　2）TTL―》光耦</p><p>　　5、CPU處理能力的考慮</p><p>　　6、成為產(chǎn)品的考慮：</p><p>　　1）電路板外形：大小尺寸、異形、連接器、空間體積</p><p>　　2）電路板模塊化設計</p><p>　　3）成本分析</p><p>　　4）器件的冗余度</p><p>　　1.電阻的功耗</p><p>　　2.電容的耐壓值等</p><p>　　5）機箱</p><p>　　6）電源的選擇</p><p>　　7）模塊化設計</p><p>　　8）成本核算</p><p>　　1.如何計算電路板的成本？</p><p>　　2.如何降低成本？選用功能滿(mǎn)足價(jià)格便宜的器件</p><p>　　十、思考題</p><p>　　1、如何檢測和指示RS422信號</p><p>　　2、如何檢測和指示RS232信號</p><p>　　3、設計一個(gè)4位8字的顯示板</p><p>　　1）電源：DC12</p><p>　　2）接口：RS232</p><p>　　3）4位3”8字（連在一起）</p><p>　　4）亮度檢測</p><p>　　5）二級調光</p><p>　　4、設計一個(gè)33位1”8字的顯示板</p><p>　　1）電源：DC5V</p><p>　　2）接口：RS232</p><p>　　3）3排11位8字，分4個(gè)、3個(gè)、4個(gè)3組，帶行與行之間帶間隔</p><p>　　4）單片機最小系統</p><p>　　5）譯碼邏輯</p><p>　　6）顯示驅動(dòng)和驅動(dòng)器件</p><p>　　5、設計一個(gè)PCL725和MOXAC168P的接口板</p><p>　　1）電源：DC5V</p><p>　　2）接口：PCL725/MOXA8個(gè)RS232</p><p>　　1.PCL725，直立DB37，孔</p><p>　　2.MOXAC168P，DB62彎</p><p>　　3）開(kāi)關(guān)量輸出信號調理：6個(gè)固態(tài)繼電器和8個(gè)繼電器，可以被任何一路信號控制和驅動(dòng)，接口：固態(tài)繼電器5.08直立，繼電器3.81直立</p><p>　　4）開(kāi)關(guān)量輸入調理：干接點(diǎn)閉合為1或0可選，接口：3.81直立</p><p>　　5）RS232調理：</p><p>　　1.LED指示</p><p>　　2.前4路RS232全信號，后4路只需要TX、RX、0</p><p>　　3.無(wú)需光電隔離</p><p>　　4.接口形式：DB9（針）直立<br /></p><p><strong>　　第二部分：軟件知識</strong></p><p>　　一、匯編語(yǔ)言</p><p>　　二、C51</p><p>　　該部分可以從市場(chǎng)上買(mǎi)到的N種開(kāi)發(fā)板上學(xué)到，至于第一部分，需要人來(lái)帶吧。</p><p>　　為什么要掌握這些知識？</p><p>　　實(shí)際上，<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/電子工程師"><em>電子工程師</em></a>就是將一堆器件搭在一起，注入思想（程序），完成原來(lái)的這些器件分離時(shí)無(wú)法完成的功能，做成一個(gè)成品。所需要的技能越高、功能越復雜成本越低、市場(chǎng)上對相應的東東的需求越大，就越成功。這就是<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/電子工程師"><em>電子工程師</em></a>的自身的價(jià)值。從成本到產(chǎn)品售出，之間的差價(jià)就是企業(yè)的追求。作為企業(yè)的老板，是在市場(chǎng)上去尋找這樣的應用；對<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/電子工程師"><em>電子工程師</em></a>而言，是將老板提出的需求或者應用按照一定的構思原則（成本最低、可靠性最高、電路板最小、功能最強大等）在最短的時(shí)間內完成。最短的時(shí)間，跟電子工程師的熟練程度、工作效率和工作時(shí)間直接有關(guān)。這就是電子工程師的價(jià)值將電子產(chǎn)品抽象成一個(gè)硬件的模型，大約有以下組成：</p><p>　　1）輸入</p><p>　　2）處理核心</p><p>　　3）輸出</p><p>　　輸入基本上有以下的可能：</p><p>　　1）鍵盤(pán)</p><p>　　2）串行接口（RS232/485/canbus/以太網(wǎng)/USB）</p><p>　　3）開(kāi)關(guān)量（TTL，電流環(huán)路，干接點(diǎn)）</p><p>　　4）模擬量（4~20ma、0~10ma、0~5V（平衡和非平衡信號））</p><p>　　輸出基本上有以下組成：</p><p>　　1）串行接口（RS232/485/canbus/以太網(wǎng)/USB）</p><p>　　2）開(kāi)關(guān)量（TTL、電流環(huán)路、干接點(diǎn)、功率驅動(dòng)）</p><p>　　3）模擬量（4~20ma，0~10ma，0~5V（平衡和非平衡信號））</p><p>　　4）LED顯示：發(fā)光管、八字</p><p>　　5）液晶顯示器</p><p>　　6）蜂鳴器</p><p>　　處理核心主要有：</p><p>　　1）8位單片機，主要就是51系列</p><p>　　2）32位arm單片機，主要有atmel和三星系列</p><p>　　51系列單片機現在看來(lái)，只能做一些簡(jiǎn)單的應用，說(shuō)白了，這個(gè)芯片也就是做單一的一件事情，做多了，不如使用arm來(lái)做；還可以在arm上加一個(gè)操作系統，程序既可靠又容易編寫(xiě)最近三星的arm受到追捧，價(jià)格便宜，以太網(wǎng)和USB的接口也有，周立功的開(kāi)發(fā)系統也便宜，作為學(xué)習ARM的產(chǎn)品來(lái)說(shuō)，應該是最好的；作為工業(yè)級的控制，是不是合適，在網(wǎng)友中有不同的看法和爭議。本公司使用atmelARM91系列開(kāi)發(fā)的1個(gè)室外使的產(chǎn)品，在北京室外使用，沒(méi)有任何的通風(fēng)和加熱的措施，從去年的5月份到現在，運行情況良好。已經(jīng)有個(gè)成功應用的案例。</p><p>　　但對于初學(xué)者來(lái)說(shuō)，應該從51著(zhù)手，一方面，51還是入門(mén)級的芯片，作為初學(xué)者練手還是比較好的，可以將以上的概念走一遍；很多特殊的單片機也是在51的核的基礎上增加了一些I/O和A/D、D/A；也為今后學(xué)習更高一級的單片機和ARM打下基礎。</p><p>　　再說(shuō)了，哪個(gè)老板會(huì )將ARM級別的開(kāi)發(fā)放在連51也沒(méi)有學(xué)過(guò)的新手手中在51上面去做復雜的并行擴展是沒(méi)有必要的，比如，擴展I/O口和A/D、D/A等等，</p><p>　　可以直接買(mǎi)帶有A/D、D/A的單片機；或者直接使用ARM，它的I/O口線(xiàn)口多?？梢允褂肐2C接口的芯片，擴展I/O口和A/D、D/A，以及SPI接口擴展LED顯示，例如MAX7219等芯片</p><p>　　市面上一些比較古老的書(shū)籍中還有一些并行擴展的例子，如：RAM、EPROM、A/D、D/A等，我覺(jué)得已經(jīng)沒(méi)有必要去看了，知道歷史上有這些一回事就行了</p><p>　　這些知識，是所有產(chǎn)品都具備的要素。所以要學(xué)，再具體應用。</p></span>  <div class="ndutxcd" id="coverDiv" class="article_reg" style="width:100%;overflow:hidden;display:none;z-index:10;position:absolute;left:0;background:#fff;"> <center> <img src="https://webstorage.eepw.com.cn/images/display/reg.jpg" border="0" usemap="#Map" /> <map name="Map" id="Map"> <area shape="rect" coords="133,235,319,253" target="_blank" /> <area shape="rect" coords="132,315,319,335" /> </map> </center> </div>  <span id="ssonsx0" class="hAd8"> <br></span>   </div> </article> <div id="0opuz0f" class="clear"></div> <br/> <div id="6awo0hl" class="hAd6"> <div class="mvao04i" id="relA" style="width:auto;height:auto;"> 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