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標(biāo)題: 單片機+ADC0808芯片，現(xiàn)在精確度是0.05，希望精確度是0.02，求指導(dǎo)如何修改? [打印本頁]

作者: 元亨利貞 時間: 2020-5-13 16:42
標(biāo)題: 單片機+ADC0808芯片，現(xiàn)在精確度是0.05，希望精確度是0.02，求指導(dǎo)如何修改?

這是文件，里面有仿真和程序

數(shù)字電壓表.rar (108.94 KB, 下載次數(shù): 14)

這是程序
#include<reg52.h>
#define LCD_DB  P2
sbit LCD_RS = P1^0;
sbit LCD_RW = P1^1;
sbit LCD_EN = P1^2;
sbit AD_OE=P3^1;
sbit AD_EOC=P3^2;
sbit AD_A=P3^4;
sbit AD_B=P3^5;
sbit AD_C=P3^6;
sbit AD_START=P3^0;
unsigned char Zh1[]=" voltmeter ";
unsigned char Zh2[]=" Voltage:    ";
unsigned char sj,ai;
int AD_sj=0,AD_ai=0;

void Busy()                //檢忙
{
unsigned char sta;
LCD_DB = 0xff;
LCD_RS = 0;
LCD_RW = 1;
do
{
LCD_EN = 1;
sta = LCD_DB;
LCD_EN = 0;
}
while(sta&0x80);
}

void Lcd_Write_Cmd(unsigned char cmd)    //命令
{
Busy();
LCD_RS = 0;
LCD_RW = 0;
LCD_DB = cmd;
LCD_EN = 1;
LCD_EN = 0;
}

void Lcd_Write_Data(unsigned char dat)    //數(shù)據(jù)
{
Busy();
LCD_RS = 1;
LCD_RW = 0;
LCD_DB = dat;
LCD_EN = 1;
LCD_EN = 0;
}
void InitLcd()                         //初始化
{
Lcd_Write_Cmd(0x38);
Lcd_Write_Cmd(0x08);
Lcd_Write_Cmd(0x01);
Lcd_Write_Cmd(0x06);
Lcd_Write_Cmd(0x0c);
}

void LcdSetCursor(unsigned char x,unsigned char y) //坐標(biāo)
{
unsigned char addr;
if(y == 0)
      addr = 0x00 + x;
else
      addr = 0x40 + x;

Lcd_Write_Cmd(addr|0X80);
}

void LcdShowStr(unsigned char x,unsigned char y,unsigned char *s)  //字符串
{
LcdSetCursor(x,y);
while(*s)
{
      Lcd_Write_Data(*s);
      s++;
}
}

//AD轉(zhuǎn)換

void AD_xsgs()  //顯示格式
{

// AD_sj=100- sj*5.00/25.5;
      AD_sj=5.00*100/255*sj;
Zh2[10]=(AD_sj/100)+0x30;
Zh2[11]='.';
Zh2[12]=(AD_sj%100/10)+0x30;
Zh2[13]=(AD_sj%100%10)+0x30;
Zh2[14]='V';
}

void AD_csh()    //AD主程序
{
      AD_A=0;
      AD_B=0;
      AD_C=0;
      AD_START=1;
      AD_START=0;
      AD_OE=0;
      AD_START=1;
      AD_START=0;
      while(AD_EOC==1);
      AD_OE=1;
      sj=P0;
      AD_OE=0;
}
void ad ()
{
      AD_A=1;
      AD_B=0;
      AD_C=0;
      AD_START=1;
      AD_START=0;
      AD_OE=0;
      AD_START=1;
      AD_START=0;
      while(AD_EOC==1);
      AD_OE=1;
      ai=P0;
      AD_OE=0;
}

void main()
{
      InitLcd();
      LcdShowStr(0,0,Zh1);
LcdShowStr(0,1,Zh2);
while(1)
{
   AD_csh();
   AD_xsgs();
   ad ();
   LcdShowStr(0,1,Zh2);
}
}

數(shù)字電壓表.rar

175.59 KB, 下載次數(shù): 7

作者: 51hei**1140 時間: 2020-5-14 08:35
你好！
1、首先，仿真里面可調(diào)電位器的變化量是1%
2、0808直接加外接時鐘，實物測量沒有任何意義

作者: wulin 時間: 2020-5-14 08:41
分辨率可以做到0.02V，精確度做不到±0.02V。

作者: 元亨利貞 時間: 2020-5-14 15:08

wulin 發(fā)表于 2020-5-14 08:41
分辨率可以做到0.02V，精確度做不到±0.02V。

分辨率怎么改為0.02V呢，可以解釋一下嗎。麻煩了

作者: w254489035 時間: 2020-5-21 15:40
不容易做到

歡迎光臨 (http://www.raoushi.com/bbs/)

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