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標題: 使用AT89C4051單片機+CD4069的簡易LC測試儀源程序電路原理圖 [打印本頁]

作者: 太陽雨ZW 時間: 2024-11-20 14:32
標題: 使用AT89C4051單片機+CD4069的簡易LC測試儀源程序電路原理圖
電路原理圖如下：

單片機源程序如下:
#include <reg51.h>
#include <intrins.h>
#define uint unsigned int
#define uchar unsigned char
#define ulong unsigned long
/**********1602************/
sbit RS=P1^7;
sbit EN=P1^6;
sbit LCD_D4=P1^3;
sbit LCD_D5=P1^2;
sbit LCD_D6=P1^1;
sbit LCD_D7=P1^0;
sbit L_C=P3^0;
//---------------------------
bit Lc=1;
uchar cnt=0;
float counter=0;
float F1=0;
float F2=0;
float C1=0;
float L1=0;
ulong temp1=0;
ulong temp2=0;
unsigned char Data[8];
unsigned char Table[]="0123456789";
/********以下是函數聲明********/
void LCD_en_write(void);//液晶使能
void LCD_by(uchar abc);//寫字節
void LCD_set_xy(uchar x, uchar y);//寫地址
void LCD_write_str(uchar X,uchar Y,uchar *s);//寫字符串
void LCD_init(void);//液晶初始化
void del_ms(uint n);//ms延時函數
void delay_5us(void);//5us延時函數
void delay_nus(uint n);//N us延時函數
void T0_T1_ini(void);//定時器初始化
void process_8(unsigned long i,unsigned char *p) ;
void display_8C(unsigned char x, unsigned char y, unsigned char *p);
ulong calc_Cx(float cl);//計算被測電容Cx
float calc_Lx(float cl);//計算被測電感Lx
void display_8L(unsigned char x, unsigned char y, uchar *p);
//-----------------------------------------
void process_8(unsigned long i,uchar *p)
{
  p[0]=i/10000000%10;
  p[1]=i/1000000%10;
  p[2]=i/100000%10;
  p[3]=i/10000%10;
  p[4]=i/1000%10;
  p[5]=i/100%10;
  p[6]=i/10%10;
  p[7]=i%10;
}
//-------------------------------------------------------
void display_8C(unsigned char x, unsigned char y, uchar *p)
{
  unsigned char i;
  LCD_set_xy( x, y );
  RS=1;
  for(i=0;i<8;i++)
  {
LCD_by(Table[p[ i]]);
  }
}
//--------------------------------------------------------
void display_8L(unsigned char x, unsigned char y, uchar *p)
{
  unsigned char i;
  LCD_set_xy( x, y );
  RS=1;
  for(i=0;i<8;i++)
  {
if(i==6)
{
   LCD_write_str(10,1,".");
}
   LCD_by(Table[p[ i]]);
  }
}
//---------------------------------------------
void LCD_en_write(void)
{
   delay_5us();
   EN=1;
   delay_5us();
   EN=0;
}
//---------------------------------------
void LCD_by(uchar abc)
{
delay_nus(500);
if(((abc<<0)&0x80)==0)
   LCD_D7=0;
   else LCD_D7=1;
if(((abc<<1)&0x80)==0)
   LCD_D6=0;
   else LCD_D6=1;
if(((abc<<2)&0x80)==0)
   LCD_D5=0;
   else LCD_D5=1;
if(((abc<<3)&0x80)==0)
   LCD_D4=0;
   else LCD_D4=1;
LCD_en_write();

if(((abc<<4)&0x80)==0)
   LCD_D7=0;
   else LCD_D7=1;
if(((abc<<5)&0x80)==0)
   LCD_D6=0;
   else LCD_D6=1;
if(((abc<<6)&0x80)==0)
   LCD_D5=0;
   else LCD_D5=1;
if(((abc<<7)&0x80)==0)
   LCD_D4=0;
   else LCD_D4=1;
LCD_en_write();
}
//----------------------------------------------
void LCD_set_xy( uchar x, uchar y )
  {
uchar address;
if (y == 0) address = 0x80 + x;
else
address = 0xc0 + x;
RS=0;
LCD_by(address);
  }
//---------------------------------------------
void LCD_write_str(uchar X,uchar Y,uchar *s)
  {
LCD_set_xy(X,Y);
RS=1;
while(*s)
{
   LCD_by(*s);
   s++;
}
  }
//------------------------------------
void LCD_init(void)
{
RS=0;
del_ms(500);

LCD_by(0x30);
del_ms(60);
LCD_by(0x30);
del_ms(10);
LCD_by(0x30);
del_ms(10);
LCD_by(0x02);
del_ms(10);
LCD_by(0x28);
del_ms(10);
LCD_by(0x08);
del_ms(10);
LCD_by(0x01);
del_ms(10);
LCD_by(0x06);
del_ms(10);
LCD_by(0x0C);
del_ms(100);
}
//----------------------------------------------
void delay_nus(uint n)//N us延時函數
  {
uint i=0;
for (i=0;i<n;i++){;}
  }
//------------------------------
void delay_5us(void)//@12.000MHz//5us延時函數
{
unsigned char data i;

_nop_();
_nop_();
i = 12;
while (--i);
}

//------------------------------
void del_ms(uint n)//ms延時函數
{
uchar j;
while(n--)
  {for(j=0;j<125;j++);}
}
//------------------------------
void T0_T1_ini(void)
{
TMOD=0x15;//T1方式1定時，T0方式1計數
TH1=(65536-50000)/256;//50ms
TL1=(65536-50000)%256;
TH0=0x00;
TL0=0x00;
TR0=1;
TR1=1;
EA=1;
ET1=1;
}
//-------------------------------
void timer1(void) interrupt 3 using 2//測頻率
{
TH1=(65536-50000)/256;//50ms
TL1=(65536-50000)%256;
TF1=0;
cnt++;
if(cnt==2)//0.1秒閘門
{
   cnt=0;
   temp1=TL0;
   temp2=TH0;
   TR0=0;
   TL0=0;
   TH0=0;
   TR0=1;
   counter=((temp2*256)+temp1)*10;
   if(Lc==1)//先測出頻率值F1
   {
   Lc=0;
   F1=counter;
   }
}
}
//--------------------------------
ulong calc_Cx(float cx)//計算C
{
  float x;
  float temp1;

  temp1=(float)F1/(float)F2;
  x=(float)(((temp1*temp1)-1)*cx);
  return x;
}
//--------------------------------
float calc_Lx(float lx)//計算L
{
  float x;
  float temp1;

  temp1=(float)F1/(float)F2;
  x=(float)(((temp1*temp1)-1)*lx);
  x=x*100;
  return x;
}
//--------------------------------
void main(void)
{
  float L2,C2;

  del_ms(1000);//等待震蕩穩定
  T0_T1_ini();
  LCD_init();
  del_ms(100);
  if(L_C==0)//檔位錯誤
  {
while(1)
{
   LCD_write_str(4,0,"Error !!!");
}
}

  while(1)
  {
F2=counter;//測頻率值F2

LCD_write_str(0,0,"fq=");
process_8(counter,Data);
display_8C(4,0,Data);
LCD_write_str(14,0,"Hz");

   if(L_C==0)//測電感
   {
      L1=76.95;//uH
      L2=calc_Lx(L1);
      LCD_write_str(0,1,"Lx=");
      process_8(L2,Data);
      display_8L(4,1,Data);
      LCD_write_str(14,1,"uH");
   }
   if(L_C==1)//測電容
   {
      LCD_write_str(12,1," ");
      C1=2408;//pF
      C2=calc_Cx(C1);
      LCD_write_str(0,1,"Cx=");
      process_8(C2,Data);
      display_8C(4,1,Data);
      LCD_write_str(14,1,"pF");
   }
}
}

作者: 太陽雨ZW 時間: 2024-11-22 11:19
電路圖中的電容C8容量應該是2200PF

作者: 太陽雨ZW 時間: 2024-11-22 11:21
電路圖中的電容C8改為2200PF

作者: uid71955 時間: 2024-11-24 16:38
問一下使用cd4069對比lm393哪一個頻率穩，我用lm393做的頻率很不穩導致數字亂跳

作者: 太陽雨ZW 時間: 2024-11-24 17:37
用CD4069的震蕩頻率在10HZ位跳動，測試值還比較穩定。C8用的是2200PF滌綸電容，其它的是獨石電容。

作者: 太陽雨ZW 時間: 2024-11-25 16:49
精度還是可以滿足一般應用的

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