目录
1.步进电机控制电路设计
所需元件：
74ls04，at89c51，cap，cap-elec，crystal，motor-stepper，res，uln2003a，74ls04。
例图：
例图代码：
#include<AT89X52.H>
void mdelay(unsigned int delay)
{
unsigned int i;
for(;delay>0;delay--)
for(i=0;i<124;i++);
}
void main()
{
while(1)
{
P1=0x03; //0运行,0011,取反1100，a，b
mdelay(50);
P1=0x06;
mdelay(50);
P1=0x0C;
mdelay(50);
P1=0x09;
mdelay(50);
}
}?2.车灯控制
所需元件：
at89c51，cap，cap-elec，27n5771，crysal，led-red，res，respack-8，sw-rot-3
例图：
?例图代码：
#include<REG52.H>
sbit LEDL1=P2^0;
sbit LEDL2=P2^1;
sbit LEDR1=P2^2;
sbit LEDR2=P2^3;
sbit S1=P1^0;
sbit S2=P1^1;
void delay(unsigned int i)
{
while(i--);
}
void main()
{
while(1)
{
P1=0xff;
LEDL1=S1;
LEDL2=S1;
LEDR1=S2;
LEDR2=S2;
delay(20000);
LEDL1=1;
LEDL2=1;
LEDR1=1;
LEDR2=1;
delay(20000);
}
}
?3. 0-59倒计时
所需元件：
7SEG-MPX2-CC,74LS245,AT89C51-CAP,CAP-ELEC,CRYSTAL,RES,RESPACK-7
例图：
?例图代码：
#include<AT89X52.h>
#include<absacc.h>
unsigned char code
Tab[]={0x3f,0x06,0x5b,0x4f,0x66,0x6D,0x7D,0x07,0x7f,0x6f,0x77,0x7c};
unsigned char Dat[]={0,0,0,0,0,0};
unsigned char Second,t;
void Delay()
{
unsigned char i;
for(i=0;i<250;i++);
}
void main()
{
EA=1;
ET0=1;
TMOD=0x01;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
TR0=1;
while(1)
{
Dat[0]=Second/10;
Dat[1]=Second%10;
P0=Tab[Dat[0]];
P1=0xfe;
Delay();
P1=0xff;
P0=Tab[Dat[1]];
P1=0xfd;
Delay();
P1=0xff;
}
}
void intserv1 (void) interrupt 1 using 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
t++;
if(t==20)
{
t=0;
Second++;
if(Second>=60) Second=0;
}
}
4.定时器，计数器--弥红灯
所需元件：
AT89C51,CAP,CAP-ELEC,CRYSTAL,LED-BARGRAPH-RED,LED-BIBY,RES
例图：
例图代码：
#include<reg52.h>
unsigned char i10,i8,i6;
unsigned char mod1,mod2;
bit F;
void main(void)
{
i10=10;
i8=8;
i6=6;
mod1=0x01;
mod2=0xAA;
F0=0;
TMOD=0x10;
TH1=0x3C;
TL1=0xB0;
IE=0x88;
TR1=1;
while(1);
}
void timer0(void) interrupt 3 using 1
{
TH1=0x3C;
TL1=0xB0;
i10--;
if(i10==0)
{
i10=10;
if(F==0)
{
P1=~mod1;
mod1=mod1<<1;
i8--;
if(i8==0)
{
i8=8;
F=1;
mod1=0x01;
}
}
else
{
P1=mod2;
mod2=~mod2;
i6--;
if(i6==0)
{
i6=6;
F=0;
}
}
}
}?5.矩形键盘
所需元件：
7SEG-COM-CATHODE,74LS21,AT89C51,BUTTIN,CAP,
CAP-ELEC,CRYSTAL,RES,74LS21
例图：
例图代码：
/*#include<AT89X52.H>
unsigned char table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,
0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
void delay10ms(void)
{
unsigned char i,j;
for(i=20;i>0;i--)
for(j=248;j>0;j--);
}
unsigned char scan_key(void)
{
unsigned char scan,col,rol,tmp;
bit flag=0;
scan=0xef;
for(col=0;col<4;col++)
{
P0=scan;
tmp=~P0;
tmp=tmp&0x0f;
for(rol=0;rol<4;rol++)
{
if(tmp==(0x01<<rol) )
{
flag=1;
break;
}
}
if(flag==1)
{
while(tmp!=0x0f)
{
P0=0x0f;
tmp=P0;
}
break;
}
scan=(scan<<1)+1;
}
return(rol*4+col);
}
/*void key_led(void) interrupt 0
{
unsigned char tmp,key;
delay10ms();
P0=0x0f;
tmp=P0;
if(tmp!=0x0f)
{
key=scan_key();
P1=table[key];
}
} */
/*void main()
{
P1=0x00;
EA=1;
EX0=1;
IT0=1;
P0=0x0f;
while(1){
scan_key();
}
}
void key_led(void) interrupt 0
{
unsigned char key,tmp;
delay10ms();
P0=0x0f;
tmp=P0;
if(tmp!=0x0f)
{
key=scan_key();
P1=table[key];
}
} */
/*#include<AT89X52.H>
unsigned char table[]={0x3f,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x77,0x7C,0x39,0x5E,0x79,0x71};
void delay10ms(void)
{
unsigned char i,j;
for(i=20;i>0;i--)
for(j=248;j>0;j--);
}
void main()
{
unsigned char tmp,key;
P1=0x00;
while(1)
{
while(tmp==0x0f)
{
P0=0x0f;
tmp=P0;
}
delay10ms();
P0=0x0f;
tmp=P0;
if(tmp==0x0f) continue;
key=scan_key();
P1=table[key];
}
}
unsigned char scan_key(void)
{
unsigned char scan,col,rol,tmp;
bit flag=0;
scan=0xef;
for(col=0;col<4;col++)
{
P0=scan;
tmp=P0;
switch(tmp&0x0f)
{
case 0x0e:rol=0;flag=1;break;
case 0x0e:rol=1;flag=1;break;
case 0x0e:rol=2;flag=1;break;
case 0x0e:rol=3;flag=1;break;
}
if(flag==1)break;
scan=(scan<<1)+1;
}
while(tmp!=0x0f)
{
P0=0x0f;
tmp=P0;
}
return(rol*4+col);
}
#include<AT89X52.H>
unsigned char table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,
0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
void delay10ms(void)
{
unsigned char i,j;
for(i=20;i>0;i--)
for(j=248;j>0;j--);
}
unsigned char scan_key(void)
{
unsigned char scan,col,rol,tmp;
bit flag=0;
scan=0xef;
for(col=0;col<4;col++)
{
P0=scan;
tmp=P0;
switch(tmp&0x0f)
{
case 0x0e: rol=0;flag=1;break;
case 0x0d: rol=1;flag=1;break;
case 0x0b: rol=2;flag=1;break;
case 0x07: rol=3;flag=1;break;
}
if( flag==1)break;
scan=(scan<<1)+1;
}
while(tmp!=0x0f)
{
P0=0x0f;
tmp=P0;
}
return(rol*4+col);
}
void main()
{
unsigned char tmp,key;
P1=0x00;
while(1)
{
while(tmp==0x0f)
{
P0=0x0f;
tmp=P0;
}
delay10ms();
P0=0x0f;
tmp=P0;
if(tmp==0x0f)continue;
key=scan_key();
P1=table[key];
}
}
*/
#include<AT89X52.H>
unsigned char table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,
0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
void delay10ms(void)
{
unsigned char i,j;
for(i=20;i>0;i--)
for(j=248;j>0;j--);
}
unsigned char scan_key(void)
{
unsigned char scan,col,rol,tmp;
bit flag=0;
scan=0xef;
for(col=0;col<4;col++)
{
P0=scan;
tmp=P0;
switch(tmp&0x0f)
{
case 0x0e: rol=0;flag=1;break;
case 0x0d: rol=1;flag=1;break;
case 0x0b: rol=2;flag=1;break;
case 0x07: rol=3;flag=1;break;
}
if( flag==1)break;
scan=(scan<<1)+1;
}
while(tmp!=0x0f)
{
P0=0x0f;
tmp=P0;
}
return(rol*4+col);
}
void main()
{
unsigned char tmp,key;
P1=0x00;
while(1)
{
while(tmp==0x0f)
{
P0=0x0f;
tmp=P0;
}
delay10ms();
P0=0x0f;
tmp=P0;
if(tmp==0x0f)continue;
key=scan_key();
P1=table[key];
}
}
6.模数转换
所需元件：
ADC0809,AT89C51,CAP,CAP-ELEC,CRYSTAL,LED-BARGRAPH-RED,LED-BIBY,
POT-HG,RES
例图：
例图代码：
#include<reg52.h>
#include<INTRINS.h>
sbit EOC=P2^4;
sbit START=P2^5;
sbit CLOCK=P2^6;
sbit OE=P2^7;
unsigned char temp;
void main(void)
{
TMOD=0x02;
TH0=206;
TL0=206;
EA=1;
ET0=1;
TR0=1;
while(1)
{
START=0;
START=1;
START=0;
while(EOC==0);
OE=1;
temp=P0;
P1=temp;
_nop_();
_nop_();
}
}
void t0(void) interrupt 1 using 0
{
CLOCK=~CLOCK;
}