PID控制的单片机炉温控制系统源码和Proteus仿真 -

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PID控制仿真图

2017-6-4 15:01 上传

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DS18B20仿真图

2017-6-4 15:01 上传

PID控制仿真如图，电加热炉OVEN输出的模拟量经ADC0804转化成数字量，再送到LCD显示。OVEN的温度与设定温度在单片机内进行PID运算，PID输出量控制晶闸管的导通，从而控制OVEN的加热。

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2017-6-4 16:12 上传

下面是51单片机的源码：

#include<reg52.h>
#include<math.h>
float R;
float Kp;
float T;
float Ti;
float Td;
float e2;
float e1,e;
float a0,a1,a2;
#define ui unsigned int
#define uc unsigned char
sbit bj=P2^4; //低电平报警模块工作
sbit lcden=P2^7; //LCD E
sbit lcdrs=P2^6; //LCD RS
sbit lcdrw=P2^5; // //LCD RW
sbit control=P2^3; //加热模块相关。低电平启动
char lshi,lge,hshi,hge;
uc num,flag;
ui temp;
sbit dsio=P3^7; //DS18B20输入口
//延时
void delay(ui z)
{
uc x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
//DS18B20控制
void dsinit()
{
uc i;
dsio=0;
i=70;
while(i--);
dsio=1;
i=4;
while(i--);
}
void dswritebyte(uc dat)
{
uc i,j;
for(j=0;j<8;j++)
{
dsio=0;
i++;
dsio=dat&0x01;
i=6;
while(i--);
dsio=1;
dat>>=1;
}
}
uc dsreadbyte()
{
uc i,j,byte,b;
for(j=0;j<8;j++)
{
dsio=0;
i++;
dsio=1;
i++;i++;
b=dsio;
byte=(byte>>1)|(b<<7);
i=4;
while(i--);
}
return byte;
}
void dschangetemp()
{
dsinit();
delay(1);
dswritebyte(0xcc);
dswritebyte(0x44);
}
void dsreadtemp()
{
dsinit();
delay(1);
dswritebyte(0xcc);
dswritebyte(0xbe);
}
ui gettemp()
{
int temp;
uc h,l;
dschangetemp();
dsreadtemp();
l=dsreadbyte();
h=dsreadbyte();
temp=h;
temp<<=8;
temp|=l;
temp=temp*0.0625*100+0.5;
return temp;
}
//LCD控制程序
void lcdwritecom(uc com)
{
lcdrs=0;
P0=com;
delay(10);
lcden=1;
delay(10);
lcden=0;
}
void lcdwritedata(uc date)
{
lcdrs=1;
P0=date;
delay(10);
lcden=1;
delay(10);
lcden=0;
}
void lcdinit()
{
lcdrw=0;
lcden=0;
lcdwritecom(0x38);
lcdwritecom(0x0c);
lcdwritecom(0x06);
lcdwritecom(0x01);
}
//LCD显示
void lcddisplay(int temp)
{
ui tab[]={0,0,0,-2,0,0};
lcdwritecom(0x80);
lcdwritedata('+');
tab[0]=temp/10000;
tab[1]=temp%10000/1000;
tab[2]=temp%1000/100;
tab[4]=temp%100/10;
tab[5]=temp%10;
lcdwritecom(0x81);
for(num=0;num<6;num++)
{
lcdwritedata('0'+tab[num]);
}
}
void adjust()
{
delay(100);
flag++;
if(flag==5)flag=1;
if(flag==1)
{
lcdwritecom(0x80+0x44);
lcdwritecom(0x0f);
}
if(flag==2)
{
lcdwritecom(0x80+0x45);
lcdwritecom(0x0f);
}
if(flag==3)
{
lcdwritecom(0x80+0x47);
lcdwritecom(0x0f);
}
if(flag==4)
{
lcdwritecom(0x80+0x48);
lcdwritecom(0x0f);
}
}
void inc()
{
delay(100);
switch(flag)
{
case 1:lshi++; if(lshi==10)lshi=0;
lcdwritedata('0'+lshi);
lcdwritecom(0x10);
break;
case 2:lge++; if(lge==10)lge=0;
lcdwritedata('0'+lge);
lcdwritecom(0x10);
break;
case 3:hshi++; if(hshi==10)hshi=0;
lcdwritedata('0'+hshi);
lcdwritecom(0x10);
break;
case 4:hge++; if(hge==10)hge=0;
lcdwritedata('0'+hge);
lcdwritecom(0x10);
break;
}
}
void dec()
{
delay(100);
switch(flag)
{
case 1:lshi--; if(lshi<0)lshi=9;
lcdwritedata('0'+lshi);
lcdwritecom(0x10);
break;
case 2:lge--; if(lge<0)lge=9;
lcdwritedata('0'+lge);
lcdwritecom(0x10);
break;
case 3:hshi--; if(hshi<0)hshi=9;
lcdwritedata('0'+hshi);
lcdwritecom(0x10);
break;
case 4:hge--; if(hge<0)hge=9;
lcdwritedata('0'+hge);
lcdwritecom(0x10);
break;
}
}
//键盘扫描
void keyscan()
{
uc test,num;
num=0;
test=P1;
if(test!=0xff)
delay(5);
test=P1;
if(test==0xf7)
{
while(P1!=0xff);
num++;
while(1)
{
test=P1;
if(test!=0xff)
delay(5);
test=P1;
if(test!=0xff)
{
if(test==0xf7)
num++;
if(num==2)
{ lcdwritecom(0x0c);
break;}
switch(test)
{
case 0xfe:adjust();
break;
case 0xfd:inc();
break;
case 0xfb:dec();
break;
}
}
while(P1!=0xff);
}
}
}
//PID
void PIDinit()
{
Kp=2;Ti=4;Td=1;T=1;R=25;
a0=Kp*(1+T/Ti+Td/T);
a1=-Kp*(1+(2*Td)/T);
a2=Kp*(Td/T);
e2=e1=0;
}
void PIDdeal()
{
float y ,u ;
y=gettemp();
e=y/100-R;
u=a0*e+a1*e1+a2*e2;
e2=e1;e1=e;
if(u>0.5||u<-0.5)
control=0;
else control=1;
}
void main()
{
uc code tab2[]="SET:20~80C";
uc i;
TMOD=0x01;
TH0=(65535-10900)/256;
TL0=(65535-10900)%256;
ET0=1;
TR0=1;
lcdinit();
lcdwritecom(0x87);
lcdwritedata('C');
lcdwritecom(0x80+0x40);
for(i=0;i<10;i++)
lcdwritedata(tab2[i]) ;
lshi=2;lge=0;hshi=5;hge=0;
while(1)
{
lcddisplay(gettemp());
keyscan() ;
EA=1; while(1);
}
}
void t0() interrupt 1
{
uc i;
TH0=(65535-10900)/256;
TL0=(65535-10900)%256;
i++;
if(i==100)
{
void PIDinit();
void PIDdeal();
}
}

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