51单片机自动换挡测电容最终版原理图与程序源码 -

#include<reg52.h>
#include "lcd1602.h"
#define uchar unsigned char
#define uint unsigned int
sbit Key1M=P1^0;
sbit Key1K=P1^1;
sbit Key1=P1^2;
sbit Key2=P1^3;
sbit Key3=P1^4;
uchar plv[]={" Hz"};
uchar cap1[]={"0000000000 uF"};
uchar cap2[]={"0000000 nF"};
uchar cap3[]={"000 pF"};
uchar n[]={" "};
unsigned long Frequency;
unsigned long C1,C2;
uchar num;
uchar T1count;
uchar D1M,D1K,ZD;
bit flag;
void dangwei();
void display();
void main()
{
init_lcd1602();
Key1M=1;
Key1K=0;
TMOD=0x51;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
TH1=0;
TL1=0;
EA=1;
TR0=1;
ET0=1;
TR1=1;
ET1=1;
while(1)
{
dangwei();
if(flag==1)
{
flag=0;
Frequency=T1count*65536+TH1*256+TL1;
plv[0]=Frequency/1000000+48;
plv[1]=Frequency/100000%10+48;
plv[2]=Frequency/10000%10+48;
plv[3]=Frequency/1000%10+48;
plv[4]=Frequency/100%10+48;
plv[5]=Frequency/10%10+48;
plv[6]=Frequency%10+48;
display_lcd1602_text(1,0,plv);
if(D1K==1)
{
Key1M=0;
Key1K=1;
C1=1.4398*1000000/(1000+2*1000)/Frequency*1000000;
display();
}
if(D1M==1)
{
Key1M=1;
Key1K=0;
C1=1.4398*1000000/(1000+2*1000000)/Frequency*1000000;
display();
}
if(ZD==1)
{
if(Frequency>50 && Key1M==1) //一旦频率大于50HZ,且为1M档
{
C1=1.4398*1000000/(1000+2*1000000)/Frequency*1000000;
display(); //将频率用1M阻值换算
}
if(Frequency<50000 && Key1K==1) //一旦频率小于50000HZ,且为1k档
{
C1=1.4398*1000000/(1000+2*1000)/Frequency*1000000;
display(); //将频率用1k阻值换算
}
if(Frequency<50 && Key1M==1) //一旦频率小于50HZ,且为1M档因为6800pf 真实频率比100HZ小，但比50HZ大
{ //从而避免一直切换
Key1M=0;
Key1K=1; //切换为1M档，让频率重新更新换算
}
if(Frequency>50000 && Key1K==1) //一旦频率大于50000HZ,且为1k档因为10000pf 真实频率比48000HZ大,但比50000小
//从而避免一直切换
{
Key1M=1; //切换为1M档，让频率重新更新换算
Key1K=0;
}
}
num=0;
T1count=0;
TH1=0;
TL1=0;
TR1=1;
}
}
}
void display()
{
if(C1<1000)
{
C2=C1;
C2=C2-26;
cap3[0]=C2/100+48;
cap3[1]=C2/10%10+48;
cap3[2]=C2%10+48;
display_lcd1602_text(0,0,n);
display_lcd1602_text(0,0,cap3);
}
if(C1>=1000&&C1<1000000)
{
C2=C1;
C2=C2-26;
cap2[0]=C2/100000+48;
cap2[1]=C2/10000%10+48;
cap2[2]=C2/1000%10+48;
cap2[3]='.';
cap2[4]=C2/100%10+48;
cap2[5]=C2/10%10+48;
cap2[6]=C2%10+48;
display_lcd1602_text(0,0,n);
display_lcd1602_text(0,0,cap2);
}
if(C1>=1000000&&C1<=600000000)
{
C2=C1;
C2=C2-26;
cap1[0]=C2/100000000+48;
cap1[1]=C2/10000000%10+48;
cap1[2]=C2/1000000%10+48;
cap1[3]='.';
cap1[4]=C2/100000%10+48;
cap1[5]=C2/10000%10+48;
cap1[6]=C2/1000%10+48;
cap1[7]=C2/100%10+48;
cap1[8]=C2/10%10+48;
cap1[9]=C2%10+48;
display_lcd1602_text(0,0,n);
display_lcd1602_text(0,0,cap1);
}
}
void dangwei()
{
// D1K=0;
// D1M=0;
// ZD=1;
if(Key1==0) //1K档位
{
delay(20);
if(Key1==0)
{
D1K=1;
D1M=0;
ZD=0;
}
}
if(Key2==0) // 1M档位
{
delay(20);
if(Key2==0)
{
D1K=0;
D1M=1;
ZD=0;
}
}
if(Key3==0) // 自动换档位
{
delay(20);
if(Key3==0)
{
D1K=0;
D1M=0;
ZD=1;
}
}
}
void jishu() interrupt 3 using 0 //定时器1 计数
{
T1count++;
}
void timer0() interrupt 1 using 0 //定时0 定时1s
{
num++;
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