毕业设计(论文)-基于51单片机数字电压表的设计.doc

基于51单片机数字电压表的设计目 录一、系统总体方案选择与说明11.1设计要求11.2 设计思路11.3 设计方案1二、硬件电路设计22.1 AT89C51的功能介绍22.1.1简单概述22.1.2主要功能特性32.1.3 AT89C51的引脚介绍32.2 ADC0808的引脚及功能介绍52.2.1芯片概述5ADC0808芯片模型52.2.2 引脚简介52.2.3 ADC0808的转换原理62.2.4 ADC0808的内部结构62.2.5 ADC0808电路接线图62.3 显示电路72.3.1 LM016L的结构及功能72.3.2 LM016L的引脚功能介绍72.3.3 LM016L的电路接线图132.4 复位电路设计132.5振荡电路设计14三、软件设计与说明10四、系统仿真与调试12五、总 结13参考文献14附 录15附录A 系统原理图15附录B 程序清单16 一、系统总体方案选择与说明1.1设计要求（1）使用51单片机,AD0809,数码管等元件组成（2）能测量0-5V的直流电压（3）能连续、稳定显示所测电压（4）测量误差999)uiNumber=999;ucaNumber0=uiNumber/100;/把计算数字的每个位存入数组。ucaNumber1=(uiNumber-100*(int)ucaNumber0)/10ucaNumber2=uiNumber-100*(int)ucaNumber0-10*ucaNumber1;for(ucCount=0;ucCount: vWriteData(0x27);break;case (: vWriteData(0x28);break;case ): vWriteData(0x29);break;case *: vWriteData(0x20);break;case +: vWriteData(0x2A);break;case -: vWriteData(0x2D);break;case /: vWriteData(0x2F);break;case =: vWriteData(0x3D);break;case : vWriteData(0x3E);break;case ?: vWriteData(0x3F);break;case .: vWriteData(0x2E);break;case : vWriteData(0x3A);break;case 0: vWriteData(0x30);break;case 1: vWriteData(0x31);break;case 2: vWriteData(0x32);break;case 3: vWriteData(0x33);break;case 4: vWriteData(0x34);break;case 5: vWriteData(0x35);break;case 6: vWriteData(0x36);break;case 7: vWriteData(0x37);break;case 8: vWriteData(0x38);break;case 9: vWriteData(0x39);break;case A: vWriteData(0x41);break;case B: vWriteData(0x42);break;case C: vWriteData(0x43);break;case D: vWriteData(0x44);break;case E: vWriteData(0x45);break;case F: vWriteData(0x46);break;case G: vWriteData(0x47);break;case H: vWriteData(0x48);break;case I: vWriteData(0x49);break;case J: vWriteData(0x4A);break;case K: vWriteData(0x4B);break;case L: vWriteData(0x4C);break;case M: vWriteData(0x4D);break;case N: vWriteData(0x4E);break;case O: vWriteData(0x4F);break;case P: vWriteData(0x50);break;case Q: vWriteData(0x51);break;case R: vWriteData(0x52);break;case S: vWriteData(0x53);break;case T: vWriteData(0x54);break;case U: vWriteData(0x55);break;case V: vWriteData(0x56);break;case W: vWriteData(0x57);break;case X: vWriteData(0x58);break;case Y: vWriteData(0x59);break;case Z: vWriteData(0x5A);break;case a: vWriteData(0x61);break;case b: vWriteData(0x62);break;case c: vWriteData(0x63);break;case d: vWriteData(0x64);break;case e: vWriteData(0x65);break;case f: vWriteData(0x66);break;case g: vWriteData(0x67);break;case h: vWriteData(0x68);break;case i: vWriteData(0x69);break;case j: vWriteData(0x6A);break;case k: vWriteData(0x6B);break;case l: vWriteData(0x6C);break;case m: vWriteData(0x6D);break;case n: vWriteData(0x6E);break;case o: vWriteData(0x6F);break;case p: vWriteData(0x70);break;case q: vWriteData(0x71);break;case r: vWriteData(0x72);break;case s: vWriteData(0x73);break;case t: vWriteData(0x74);break;case u: vWriteData(0x75);break;case v: vWriteData(0x76);break;case w: vWriteData(0x77);break;case x: vWriteData(0x78);break;case y: vWriteData(0x79);break;case z: vWriteData(0x7A);break;default: break;void vShowChar(unsigned char ucaChar)unsigned char ucCount;for(ucCount=0;ucCount+)vShowOneChar(ucaCharucCount);if(ucaCharucCount+1=0)break; void vDelay() /延时函数unsigned int uiCount;for(uiCount=0;uiCount250;uiCount+); #include /AD转换函数#define START P3_4 /SATART，ALE接口。0-1-0:启动AD转换。#define EOC P3_3 /转换完毕由0变1.#define OUTPORT P2 /AD转换函数，返回转换结果。/转换结果是3位数，小数点在百位与十位之间。unsigned int uiADTransform()unsigned int uiResult;START=1; /启动AD转换。START=0;while(EOC=0); /等待转换结束。uiResult=OUTPORT; /出入转换结果。uiResult=(100*uiResult)/51; /处理运算结果。return uiResult;电气信息学院课程设计评分表项 目评 价优良中及格差设计方案的合理性与创造性软件设计完成情况硬件调试完成情况设计说明书与设计图纸质量答辩情况独立工作能力完成任务情况出勤情况综 合 评 分 指导教师签名：_ 日 期：_设计内容与设计要求设计内容：设计一个简易数字电压表，设计内容包括：(1)使用51单片机,AD0809,数码管等元件组成(2)能测量0-5V的直流电压(3)能连续、稳定显示所测电压(4)测量误差0.02V）设计要求：1）确定系统设计方案； 2）进行系统的硬件设计3）完成必要的参数计算与元器件选择；4）完成应用程序设计