分布式电压采集系统分布式电压采集系统1．目的利用单片机双机通信实现多通道采集控制以及采集电压的异地显示。

2．系统组成图1 系统组成3．基本设计要求（1）甲机用于电压信号的采集，要求采集2路电压信号（信号源可由电位器分压得到），将当前采样的通道号和电压值在数码管或LCD进行显示。

（2）实现甲机和乙机的数据通信，采用RS-232方式完成通信接口。

（3）乙机通过键盘设置甲机的采集电压通道，并将给信息发送给甲机。

4．发挥部分（1）乙机控制甲机电压采集通道，并接收甲机的采集电压数据在乙机的数码管或LCD上进行显示。

（2）增加实现2路信号的同时采集的功能，并进行采样电压的同时显示。

（3）其他发挥。

注：发挥部分前两点可不用同时满足。

留出相关测试点，程序固化到单片机中。

电路图：略甲机程序：#include <reg52.h>#define uint unsigned int#define uchar unsigned char///////相关变量定义///////bit shift;uchar num,key;float temp;uchar val_int;uchar val_decimal;uchar flag=0;///////I/O口定义/////////sbit STA_ALE = P3^6;sbit EOC = P3^1;sbit OE = P3^7;sbit ADC_C = P2^0;sbit ADC_B = P2^1;sbit ADC_A = P2^2;sbit W1=P2^3;sbit W2=P2^4;sbit W3=P2^5;sbit W4=P2^6;sbit wela=P2^7;////////带小数点数码管显示编码/////////// uchar data numtable_DE[] ={0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10};////////不带小数点数码管显示编码/////////// uchar data numtable[] ={0xb0,0xf9,0xa4,0xa0,0x99,0x92,0x82,0xf8,0x80,0x90};///////数码管动态显示函数声明/////// void disp();///////延时函数///////void delay(uint x){uint a,b;for ( a = x; a > 0; a--)for ( b = 110; b > 0; b--);}///////数码管动态显示函数/////// void disp(){P0 = numtable_DE[val_int];wela=1;W3=1;wela=0;delay(5);W3=0;P0 = numtable[(val_decimal/10)]; wela=1;W2=1;wela=0;delay(5);W2=0;P0 = numtable[(val_decimal)%10];wela=1;W1=1;wela=0;delay(5);W1=0;}///////通道编号的数码管显示函数/////// void disp_in(uchar a){P0 = numtable[a];wela=1;W4=1;wela=0;delay(5);W4=0;}///////通道1的AD转换函数///////void ADC_1(){STA_ALE = 0;ADC_C = 0;ADC_B = 0;ADC_A = 0;STA_ALE = 1;delay(5);STA_ALE = 0;}///////通道2的AD转换函数///////void ADC_2(){STA_ALE = 0;ADC_C = 0;ADC_B = 0;ADC_A = 1;STA_ALE = 1;delay(5);STA_ALE = 0;}///////判别是哪条通道AD转换函数///////void ADC(uchar ad_dat) {if (!shift){OE=0;ADC_1();delay(5);while(!EOC);OE=1;disp();disp_in(1);ES=0;SBUF=0xaa;while(!TI);TI=0;SBUF=P1;while(!TI);TI=0;ES=1;}if (shift){OE=0;ADC_2();while(!EOC);OE=1;disp();disp_in(2);ES=0;SBUF=0xff;while(!TI);TI=0;SBUF=P1;while(!TI);TI=0;ES=1;}temp = ad_dat*0.0196078;val_int = (uchar) temp;val_decimal = (uchar) ((temp - val_int)*100); }//初始化void init(){TMOD=0x21;TH1=0xfd;TH0 =(65535-45872)/256; TL0 =(65535-45872)%256; TR1=1;ET0=1;SM0=0;SM1=1;REN=1;EA=1;ES=1;}///////主函数//////int main (){init();while(!flag);while(1){if(key==0xa1){ TR0=0;shift=0;ADC(P1);}if(key==0xb2){ TR0=0;shift=1;ADC(P1);}if(key==0xc3){TR0=1;}ADC(P1);}}void T0_srv() interrupt 1 {TH0 =(65535-45872)/256; TL0 =(65535-45872)%256; num++;if(num==30){num=0;shift=!shift;}}void ser() interrupt 4 {RI=0;key=SBUF;flag=1;}乙机程序：1602头文件：#define uchar unsigned char#define uint unsigned intsbit lcd_rs=P3^5;sbit lcd_en=P3^4;void delay(uint z);void write_com(uchar com);void write_data(uchar date);void init();1602c文件#include<reg52.h>#define uchar unsigned char#define uint unsigned intsbit lcd_rs=P3^5;sbit lcd_en=P3^4;void delay(uint z){uint x,y;for(x=z;x>0;x--)for(y=110;y>0;y--); }void write_com(uchar com){lcd_rs=0;P0=com;delay(5);lcd_en=1;delay(5);lcd_en=0;}void write_data(uchar date){lcd_rs=1;P0=date;delay(5);lcd_en=1;delay(5);lcd_en=0;}void init(){lcd_en=0;write_com(0x38);write_com(0x0c);write_com(0x06);write_com(0x01);}主程序：#include<reg52.h>#include<1602.h>#define uchar unsigned char#define uint unsigned intuchar key,ad_data,num,num1;float temp;uchar a,b,c;bit flag;sbit key1=P3^2;sbit key2=P3^3;sbit key3=P3^6;uchar d[2];uchar code table[]="tongdao1: ";uchar code table1[]="tongdao2: ";uchar val_int;uchar val_decimal;void keyscan() //键盘扫描，并发送按键值{if(key1==0){delay(10);if(key1==0)key=1;while(!key1);write_com(0x01);ES=0;SBUF=0xa1;while(!TI);TI=0;ES=1;}if(key2==0){delay(10);if(key2==0)key=2;while(!key2);write_com(0x01);ES=0;SBUF=0xb2;while(!TI);TI=0;ES=1;}if(key3==0){delay(10);if(key3==0)key=3;while(!key3);ES=0;SBUF=0xc3;while(!TI);TI=0;ES=1;}}void display1(uchar a1,uchar b1,uchar c1) //1通道显示{write_com(0x80);for(num=0;num<10;num++){write_data(table[num]);delay(5);}write_data(a1+0x30);write_data('.');write_data(b1+0x30);write_data(c1+0x30);write_data('V');}void display2(uchar a2,uchar b2,uchar c2) //2通道显示{if(key==2)write_com(0x80);else write_com(0x80+0x40);for(num=0;num<10;num++){write_data(table1[num]);delay(5);}write_data(a2+0x30);write_data('.');write_data(b2+0x30);write_data(c2+0x30);write_data('V');}void chuli(){if(key==1){if(d[0]==0xaa)display1(a,b,c);}if(key==2){if(d[0]==0xff)display2(a,b,c);}if(key==3){if(d[0]==0xaa)display1(a,b,c);if(d[0]==0xff)display2(a,b,c);}temp = ad_data*0.0196078;val_int = (uchar) temp;val_decimal = (uchar) ((temp - val_int)*100); a=val_int;b=val_decimal/10;c=val_decimal%10;}void init_kz(){TMOD=0x20;TH1=0xfd;TL1=0xfd;EA=1;TR1=1;SM0=0;SM1=1;REN=1;ES=1;}main(){init();init_kz();while(1){keyscan();if(key==1||key==2||key==3) {delay(10);while(!flag);flag=0;chuli();}}}void ser() interrupt 4{RI=0;for(num1=0;num1<2;num1++) {d[num1]=SBUF;}ad_data=d[1];flag=1;}。