1923_基于單片機(jī)的多功能信號(hào)發(fā)生器

1923_基于單片機(jī)的多功能信號(hào)發(fā)生器,基于,單片機(jī),多功能,信號(hào)發(fā)生器 黃 河 科 技 學(xué) 院 畢 業(yè) 設(shè) 計(jì) 說 明 書 第 I 頁基于單片機(jī)的多功能信號(hào)發(fā)生器摘 要信號(hào)發(fā)生器是一種常用的信號(hào)源，廣泛地應(yīng)用于電子電路、自動(dòng)控制系統(tǒng)和教學(xué)實(shí)驗(yàn)等領(lǐng)域。目前使用的信號(hào)發(fā)生器大部分是函數(shù)信號(hào)發(fā)生器，且特殊波形發(fā)生器的價(jià)格昂貴。所以本設(shè)計(jì)使用的是 AT89C51 單片機(jī)構(gòu)成的發(fā)生器，可產(chǎn)生三角波、方波、正弦波等多種特殊波形和任意波形，波形的頻率可用程序控制改變。在單片機(jī)上加外圍器件距陣式鍵盤，通過鍵盤控制波形頻率的增減以及波形的選擇，并用了 LCD 顯示頻率大小。在單片機(jī)的輸出端口接 DAC0832 進(jìn)行 D/A 轉(zhuǎn)換，再通過運(yùn)放進(jìn)行波形調(diào)整，最后輸出波形接在示波器上顯示。本設(shè)計(jì)具有線路簡(jiǎn)單、結(jié)構(gòu)緊湊、價(jià)格低廉、性能優(yōu)越等優(yōu)點(diǎn)。關(guān)鍵詞：信號(hào)發(fā)生器，單片機(jī)，波形調(diào)整 黃 河 科 技 學(xué) 院 畢 業(yè) 設(shè) 計(jì) 說 明 書 第 II 頁Design Of Signal-generator Combing With One-chip ComputerAbstractAuthor：Liu BingTutor：Niu YuelanSignal-generator is a kind of signal source in common use, broadly applied at the electronics electric circuit, auto control system and teaching experiment etc. Currently used mostly function signal generator signal generator, waveform generator and a special price of expensive . So the dissertation is usage of the AT89C51 single-chip microcomputer constitute of wave-form generator, which can generate triangle wave, square wave, sine wave etc variety wave-form, the period of wave can be controlled by procedure, at outer circle spare part of the machine, plus independence type keyboard , which can control wave increase or decrease of form-frequency and the choice of wave-form, at the same time LED display frequency size. The output of the machine connect DAC0832 to carry on a DA conversion，again pass operation amplifier to put an end exportation wave-form. This design has advantage of simple circuit, tightly packed structure, cheap price, superior function etc.Key words：Signal generator, MCU, Wave-form adjustment 黃 河 科 技 學(xué) 院 畢 業(yè) 設(shè) 計(jì) 說 明 書 第 III 頁目錄1 緒 論 ...................................................................11.1 課題背景 ..........................................................11.2 課題意義 ..........................................................11.3 國(guó)內(nèi)外的研究狀況 ..................................................21.3.1 波形發(fā)生器的發(fā)展?fàn)顩r .........................................21.3.2 本課題在國(guó)內(nèi)外的研究現(xiàn)狀 ....................................32 信號(hào)發(fā)生器的方案研究 ....................................................42.1 總體方案論證與設(shè)計(jì) ................................................42.2 系統(tǒng)整體設(shè)計(jì)方案 ...................................................43 硬件電路的設(shè)計(jì) ..........................................................53.1 主控芯片的選擇 .....................................................53.1.1 AT89C51 主要特性 ..............................................53.1.2 AT89C51 時(shí)鐘及復(fù)位電路設(shè)計(jì) ....................................53.2 D/A 轉(zhuǎn)換電路設(shè)計(jì) ...................................................73.2.1 DAC0832 芯片 ..................................................73.2.2 DAC0832 波形產(chǎn)生原理 ..........................................93.2.3 D/A 轉(zhuǎn)換電路 ..................................................93.3 數(shù)碼管顯示電路設(shè)計(jì) ................................................103.3.1 顯示原理 .....................................................103.3.2 顯示電路 .....................................................123.4 通信接口電路設(shè)計(jì) ..................................................123.5 電源電路設(shè)計(jì) ......................................................133.6 整體硬件電路設(shè)計(jì) ..................................................144 軟件設(shè)計(jì) ...............................................................154.1 系統(tǒng)主程序設(shè)計(jì) ....................................................154.2 方波子程序設(shè)計(jì) ....................................................164.2.1 方波程序總流程 ...............................................16 黃 河 科 技 學(xué) 院 畢 業(yè) 設(shè) 計(jì) 說 明 書 第 IV 頁4.2.2 方波產(chǎn)生程序設(shè)計(jì) .............................................164.2.3 方波顯示程序設(shè)計(jì) .............................................174.3 鋸齒波子程序設(shè)計(jì) ..................................................174.3.1 鋸齒波產(chǎn)生原理 ...............................................174.3.2 鋸齒波程序設(shè)計(jì) ...............................................184.4 三角波子程序設(shè)計(jì) ..................................................194.5 正弦波子程序設(shè)計(jì) ..................................................204.5.1 正弦波產(chǎn)生原理 ...............................................204.5.2 正弦波程序設(shè)計(jì) ...............................................215 系統(tǒng)硬件的調(diào)試及系統(tǒng)分析 ................................................225.1 仿真工具 ..........................................................225.2 仿真原理圖 ........................................................225.3 顯示模塊調(diào)試 ......................................................235.4 D/A 模塊調(diào)試 ......................................................24結(jié) 論 ...................................................................28致 謝 ...................................................................29參考文獻(xiàn) .................................................................30附錄 .....................................................................31附錄 A ................................................................31附錄 B ................................................................32