项目概要在这个项目中，我们正在建设一个基本的和低成本的频率计数器电路。它可以测量从16Hz到100Hz的信号的最大振幅为15V。灵敏度高，分辨率为0.01Hz。该输入信号可以是正弦波，一个正方形或三角形波形。 项目简介该计数器可以用于许多应用。例如，要观察的振荡器的精度，测量电源频率，或者找出连接到编码器的电动机的转速。 提供的PCB图，您可以用熨烫的方法制作PCB板。
元件清单：
数码管是14.2毫米普通阴极七段LED红光数码管。
在测量频率的输入信号，信号必须被转换为方波。因此，一个光隔离器4N25光耦电路用于这一目的。因此，输入信号是从微控制器的电路的安全隔离，并转换为方波。信号幅度不得超过15V。如果发生这种情况，1K电阻可能会烧掉。如果你想测量电源频率，你应该使用一个220V/9V变压器转换。 电源电压应在8-12V之间。由于电路可能会投奔，你应该小心，同时连接电源的极性。
计数器电路原理图中，有4个LED显示数码管。为了进行测量，在RB3引脚连接到输出光纤隔离器。所述第二显示的5编号的引脚被连接到电源通过1K的电阻，所以点之后的第二显示亮色。在原理图中未示出此连接。
#p#分页标题#e#
我们使用了额外的两个插座。一（18针，2路）PIC16F628微控制器，另一种是（40针，2路）七段显示器。
频率计的PCB板图
源程序：
(责任编辑：admin)
//---------------------------------------------
// FREQUENCY COUNTER
// www.circuit-projects.com
// Y.Erol
//---------------------------------------------
#include <pic.h>
#include <delay.c>
__CONFIG(WDTDIS&PWRTEN&LVPDIS&XT);
unsigned char kontrol;
//---------------------------------------------
// CCP1 INTERRUPT
//---------------------------------------------
void interrupt interrupt(void){
TMR1H=0; TMR1L=0;
GIE=0;
#p#分页标题#e#
control=1;
CCP1IF=0;
GIE=1;
}
//---------------------------------------------
// MAIN PROGRAM
//---------------------------------------------
main(void)
{
unsigned const char number[10]={0x3F,0x06,0x5B,
0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};
unsigned char select[4]={1,2,4,8};
unsigned int counter,value,remainder1,remainder2;
float frekans;
unsigned char a,i,display[5],data;
TRISA=0x00;
TRISB=0x08;
CMCON=0x07;
cont=0;
PORTA=0; PORTB=0
CCP1IE=1;
CCP1CON=0b00000110;
T1CON=0b00100001;
GIE=1;
PEIE=1;
for(;;){
counter=256*CCPR1H+CCPR1L;
if(control==1)frequency=100000000/counter;
if(kontrol==0)frequency=0;
if(counter<10000)frequency=0;
control=0;
for(a=0;a<25;a++){
value=(int)frequency;
#p#分页标题#e#
display[1]=value/1000;
remainder1=value-display[1]*1000;
display[2]=remainder1/100;
remainder2=remainder1-display[2]*100;
display[3]=remainder2/10;
display[4]=remainder2-display[3]*10;
for(i=0;i<4;i++){
PORTB=0;
PORTA=0;
data=number[display[i+1]];
PORTB=data&0x07;
data=data<<1;
PORTB=PORTB|(data&0xF0);
PORTA=select[i];
DelayMs(3);
}
}
}
}
HEX文件：
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|
