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数控直流稳压电源的设计 输出电压0~9.9v，步进0.1v可调，数模转换，数码管显示电压值。电路图和设计报告非常齐全。

#include #define uchar unsigned char #define uint unsigned int sbit led=P2^5; sbit wei=P2^7; sbit duan=P2^6; sbit DQ=P2^2; uchar mazhi_duan[]={0x3f,0x06,0x5b,0x4f, 0x66,0x6d,0x7d,0x07, 0x7f,0x6f,0x77,0x7c, 0x39,0x5e,0x79,0x71,0x00}; uchar mazhi_wei[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xff}; void delayl(uint n) { uint i,j; for(i=n;i>0;i--) for(j=114;j>0;j--); } void delays(uchar i) { while(i--); } bit init_DS18B20() //DS8B20初始化 { bit x; DQ=1; //DQ复位 delays(8); DQ=0; //单片机将DQ拉低 delays(75); DQ=1; //拉高总线 delays(15); x=DQ; //延时过后 若x=0则初始化成功 若x=1则初始化失败 delays(5); return x; } void write_data(uchar dat) { uchar i,temp; temp=dat; DQ=1; for(i=0;i>=1; } } uchar read_data() { uchar i,dat; DQ=1; for(i=0;i>=1; DQ=1;//配置为输入 if(DQ) dat|=0x80; delays(4); } return dat; } uint readtemp() { uchar temph,templ; uint temp; float wendu; init_DS18B20(); write_data(0xcc);//跳过ROM write_data(0x44);//启动温度转换 //delayl(100); init_DS18B20(); write_data(0xcc);//跳过ROM write_data(0xBE);//读温度 //以下读温度，低八位在前 //高8位在后 templ=read_data(); temph=read_data(); temp = (temph<<8)|templ; wendu = temp*0.625+0.5;//温度扩大10倍，四舍五入 temp = wendu;//10倍温度 return temp; } void STC_init() { P1=0x00;//关闭led led=0; //锁存 wei=0; duan=0; } void display(uchar weil,uchar duanl,bit dp) { wei=1; P0=mazhi_wei[weil-1]; wei=0; duan=1; if(dp==1) P0=(mazhi_duan[duanl]|0x80); else P0=mazhi_duan[duanl]; duan=0; } void main() { uchar i; uint wendu; STC_init(); wendu=readtemp(); delayl(500); wendu=readtemp(); delayl(500); while(1) { wendu=readtemp(); for(i=0;i<80;i++) { display(1,wendu/100,0); delayl(3); display(2,wendu0/10,1); delayl(3); display(3,wendu,0); delayl(3); } } }

单片机数模转换程序 将da#include //52系列单片机头文件 #include #define uchar unsigned char #define uint unsigned int sbit dula=P2^6; //申明U1锁存器的锁存端 sbit wela=P2^7; //申明U2锁存器的锁存端 sbit adwr=P3^6; //定义AD的WR端口 sbit adrd=P3^7; //定义AD的RD端口 sbit led=P2^5; sbit DAC0832_CS = P3^2; sbit DAC0832_WR = P3^6; sbit AD_CS=P0^7; uchar code table[]={ 0x3f,0x06,0x5b,0x4f, 0x66,0x6d,0x7d,0x07, 0x7f,0x6f,0x77,0x7c, 0x39,0x5e,0x79,0x71}; uchar weima[] = {0xff,0xfe,0xfd,0xfb,0xf7,0xef,0xdf}; void delayms(uint xms) { uint i,j; for(i=xms;i>0;i--) //i=xms即延时约xms毫秒 for(j=110;j>0;j--); } void display(uchar bai,uchar shi,uchar ge) //显示子函数 { dula=1; P0=table[bai]|0x80; //送段选数据 dula=0; P0=0xff; //送位选数据前关闭所有显示，防止打开位选锁存时 wela=1; //原来段选数据通过位选锁存器造成混乱 P0=0x7e; //送位选数据 wela=0; delayms(1); //延时 dula=1; P0=table[shi]; dula=0; P0=0xff; wela=1; P0=0x7d; wela=0; delayms(1); dula=1; P0=table[ge]; dula=0; P0=0xff; wela=1; P0=0x7b; wela=0; delayms(1); } /*void displays(uchar a ,uchar b,uchar c) //显示子函数 { dula=1; P0=table[a]; //送段选数据 dula=0; P0=0xff; //送位选数据前关闭所有显示，防止打开位选锁存时 wela=1; //原来段选数据通过位选锁存器造成混乱 P0=0x77; //送位选数据 wela=0; delayms(1); //延时 dula=1; P0=table[b]; dula=0; P0=0xff; wela=1; P0=0x6f; wela=0; delayms(1); dula=1; P0=table[c]; dula=0; P0=0xff; wela=1; P0=0x5f; wela=0; delayms(1); } */ void displays(uchar shuzi,uchar weizhi,bit dp) { dula=1; if(dp) P0 = table[shuzi]|0x80; else P0 = table[shuzi]; dula=0; wela=1; P0 = weima[weizhi]; wela=0; } void main() // 主程序 { uint ad; uchar A1,A2,A3,adval; AD_CS=1; //置CSAD为0，选通ADCS 以后不必再管ADCS DAC0832_CS = 0; DAC0832_WR = 0; while(1) { wela=1; P0=0x7f; wela=0; adwr=1; _nop_(); adwr=0; //启动AD转换 _nop_(); adwr=1; P1=0xff; //读取P1口之前先给其写全1 adrd=1; //选通ADCS _nop_(); adrd=0; //AD读使能 _nop_(); adval=P1; ad=adval*1.941; //AD数据读取赋给P1口 adrd=1; A1=ad/100; //分出百，十，和个位 A2=ad0/10; A3=ad; P1=(~adval); P0=adval; displays(adval/100,4,0); delayms(1); displays(adval0/10,5,0); delayms(1); displays(adval,6,0); delayms(1); display(A1,A2,A3); } } ad的数据相互转换