基于单片机的简易电子琴设计（电路+程序）

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基于51单片机设计的简易电子琴下面直接给出proteus仿真

#include <reg51.h> 

#define uint unsigned int 

#define uchar unsigned char

#define output P1

#define input P1

//方便移植在其他电路板上，我的电路使用P1口做键盘输入接口

//定义16个按键

enum KEY{key0,key1,key2,key3,key4,key5,key6,key7,key8,key9,key10,key11,key12,key13,key14,key15};

uchar code table[]={                  //数组定义,显示数码管

        0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,

        0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00};

unsigned int code Freqtab[] = {     //定时半周期的初始值

     64021,64103,64260,64400,      //低音3 4 5 6

     64524,64580,64684,64777,      //低音7,中音1 2 3

     64820,64898,64968,65030,      //中音4 5 6 7

     65058,65110,65157,65178};     //高音1 2 3 4

uint FreqTemp;

//蜂鸣器声音不怎么样，我们使用扬声器，接P3.7口

sbit SPEAK = P3^7;

void delay1ms(uint n)   //误差 0us ,延时n毫秒

{

    uint a,b,c;

    for(c=n;c>0;c--)

        for(b=199;b>0;b--)

            for(a=1;a>0;a--);

}

 

uint key_input(void)

{

    uchar temp1,temp2;          //临时保存读取的行或者列

    uchar num = 16;             //返回按键的值

    output = 0x0f;      

    temp1 = input;              //先读取行

    if(0x0f != temp1)           //按键按下

    {                   

        delay1ms(5);            //延时，消除抖动

        temp1 = input;          //再次读取行

        if(0x0f != temp1)       //说明按键确实按下  

        {

            temp1 = temp1 & 0x0f;   //保留低4位

            output = 0xf0;          //准备读取列

            delay1ms(1);            //延时一下，防止下一句读不到

            temp2 = input;          //直接读取列

            temp2 = temp2 & 0xf0;   //保留高4位

            temp1 = temp1 | temp2;  //将temp1和temp2的值合并

        }

    }

    switch(temp1)

    {

        case 0xee:num=0;break;  

        case 0xde:num=1;break;  

        case 0xbe:num=2;break;   

        case 0x7e:num=3;break; 

        case 0xed:num=4;break;               

        case 0xdd:num=5;break;           

        case 0xbd:num=6;break;             

        case 0x7d:num=7;break;   

        case 0xeb:num=8;break;    

        case 0xdb:num=9;break;    

        case 0xbb:num=10;break;   

        case 0x7b:num=11;break;    

        case 0xe7:num=12;break;   

        case 0xd7:num=13;break;   

        case 0xb7:num=14;break;    

        case 0x77:num=15;break;      

        default:break;

    }

    return num;

}

void T0_INT(void) interrupt 1

{

     TL0 = FreqTemp;                //载入定时半周期的初始值

     TH0 = FreqTemp >> 8;

     SPEAK = ~SPEAK;                    //发音

} 

int main()

{

    TMOD = 0X01;        //定时器T0设置为方式1

    EA = 1;

    ET0 = 1;

    TR0 = 0;

    while(1)

    {

        uint num,temp;

        num = key_input();

        temp = num;

        P0 = table[num];

        if(16 != num)

        {

            FreqTemp = Freqtab[num];

            TR0 = 1;

            while(0xf0 != output);      //检测按键松开

            TR0 = 0;

            SPEAK = 1;  

        }       

    }

    return 0;

}