PIC16F628频率计数器的制作

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：
1个PIC16F628 - 04 / P微控制器
4位共阴极7段LED显示器
1×通用光电耦合器4N25
5所述BC547NPN晶体管
1×7805稳压器
7×330欧姆1/4 W电阻
7×1K 1/4 W电阻
1 1/4 W×470欧姆电阻
1×10K 1/4电阻
1×4.7K 1/4 W电阻
1×1N4148二极管
2×220nF的涤纶电容器
2×22pF电容陶瓷电容器
2×100uF的16V电解电容器
1×4MHz晶振振荡器

制作频率计需要的元件

　　数码管是14.2毫米普通阴极七段LED红光数码管。

制作完成的频率计

　　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。

频率计的电源电路原理图

频率计的信号探测原理图

频率计的电路原理

工作中的频率计

　　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板元件布局图

频率计的PCB板图源程序：
//---------------------------------------------// FREQUENCY COUNTER// www.circuit-projects.com // Y.Erol//---------------------------------------------#include pic.h#include delay.c__CONFIG(WDTDISPWRTENLVPDISXT);unsigned char kontrol;//---------------------------------------------// CCP1 INTERRUPT//---------------------------------------------void interrupt interrupt(void){TMR1H=0; TMR1L=0;GIE=0;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=0CCP1IE=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(counter10000)frequency=0;control=0;for(a=0;a25;a++){value=(int)frequency;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;i4;i++){PORTB=0;PORTA=0;data=number[display[i+1]];PORTB=data0x07;data=data1;PORTB=PORTB|(data0xF0);PORTA=select[i];DelayMs(3);}}}}

HEX文件：
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