基于51的数字电压表设计+原理图+源程序

#include<reg52.h> #include"1602.h" #define uint unsigned int #define uchar unsigned char sbit ale=P2^6; sbit start=P2^7; sbit eoc=P3^0; sbit oe=P3^1; sbit adda=P2^0; sbit addb=P2^1; sbit addc=P2^2; uchar add; uint voltdata,realvolt; void addselect() { switch(add) { case 0:adda=0;addb=0;addc=0;break; case 1:adda=1;addb=0;addc=1;break; case 2:adda=0;addb=1;addc=0;break; default:break; } } uint adtrans() { addselect(); ale=1; ale=0; start=1; //启动AD转换。 start=0; while(eoc==0); //等待转换结束。 oe=1; voltdata=P1; //出入转换结果。 delay(1); oe=0; voltdata=(100*voltdata)/51; //处理运算结果。 return voltdata; } void disvolt() { uchar qian,bai,shi,ge; switch(add) { case 0:realvolt=voltdata;writelcd_cmd(0x80+15);writelcd_dat('0');writelcd_cmd(0xc0+4);writelcd_dat('0');writelcd_dat('5');break; case 1:realvolt=voltdata*2;writelcd_cmd(0x80+15);writelcd_dat('1');writelcd_cmd(0xc0+4);writelcd_dat('1');writelcd_dat('0');break; case 2:realvolt=voltdata*10;writelcd_cmd(0x80+15);writelcd_dat('2');writelcd_cmd(0xc0+4);writelcd_dat('5');writelcd_dat('0');break; default:break; } qian=realvolt/1000; bai=realvolt%1000/100; shi=realvolt%100/10; ge=realvolt%10; writelcd_cmd(0xc0+9); writelcd_dat(qian+0x30); writelcd_dat(bai+0x30); writelcd_cmd(0xc0+12); writelcd_dat(shi+0x30); writelcd_dat(ge+0x30); } void init() { EA=1; EX0=1; IT0=1; add=0; lcd_init(); } void main() { init(); while(1) { adtrans(); disvolt(); } } void ext() interrupt 0 { add++; add=add%3; }