#include ‘reg52.h’

#include ‘stdio.h’

#define uchar unsigned char

#define uint unsigned int

sbit s1=P2^0;

sbit s2=P2^1;

sbit s3=P2^2;

sbit s4=P2^3;

sbit s5=P2^4;

sbit ds=P2^5;

sbit beep=P2^6;

sbit rd=P1^0;

sbit rs=P1^1;

sbit wr=P1^2;

sbit lcden=P1^3;

sbit PWM=P1^6;

sbit led1=P1^4;

sbit led2=P1^5;

uchar set_temp,keytemp;

uint temp;

uchar c;

bit flag,flag1,flag2;

float f_temp,t;

int timecount,z;

float KP,KI,KD;

float e1,e2,e3;

float uk,duk;

uchar HighL,HighH,PWMH;

float k;

uchar code table[]={"设定温度："};

uchar code table1[]={"实测温度："};

uchar code table2[]={"加热"};

uchar code table3[]={"保温"};

uchar code table4[]={"作者：0903锋仔@"};

uchar code table5[]={"系统初始化"};

uchar code table6[]={"measured Temperature"};

uchar code table7[]={"水温控制系统设计"};

uchar code table8[]={"  "};

void delay(uint z)//延时函数，延时5ms

{

uint x,y;

for(x=z;x>0;x--)

for(y=110;y>0;y--);

}

void keyscan()

{

if(set_temp>=100)//将设定温度限定在0-100度之间

set_temp=100;

if(set_temp<=0)

set_temp=0;

if(s5==0)//此键按下设定温度加5

{

delay(10);

if(s5==0)

{

flag1=0;

set_temp+=5;

if(set_temp>=100)

{

set_temp=100;

beep=0;

delay(1000);

beep=1;

}

}while(s5==0);

}

if(s4==0)//此键按下设定温度减5

{

delay(10);

if(s4==0)

{

flag1=0;

set_temp-=5;

if(set_temp<=0)

{

set_temp=0;

beep=0;

delay(1000);

beep=1;

}

}while(s4==0);

}

if(s3==0)//此键按下设定温度加1

{

delay(10);

if(s3==0)

{

flag1=0;

set_temp++;

if(set_temp==100)

{

set_temp=100;

beep=0;

delay(1000);

beep=1;

}

}while(s3==0);

}

if(s2==0)//此键按下设定温度减1

{

delay(10);

if(s2==0)

{

flag1=0;

set_temp--;

if(set_temp==0)

{

set_temp=0;

beep=0;

delay(1000);

beep=1;

}

}while(s2==0);

}

if(s1==0)//确定加热状态(加热与不加热)

{

delay(10);

if(s1==0)

{

flag1=1;

}

while(s1==0);

}

}

void dsreset()//DS18B20复位函数

{

uint i;

ds=0;

i=103;

while(i>0)i--;

ds=1;

i=4;

while(i>0)i--;

}

bit tempreadbit()//从DS18B20 RAM读一位数据

{

uint i;

bit dat;

ds=0;i++;

ds=1;i++;i++;

dat=ds;

i=8;while(i>0)i--;

return(dat);

}

uchar tempread()//从DS18B20 RAM读一字节数据

{

uchar i,j,dat;

dat=0;

for(i=1;i<=8;i++)

{

j=tempreadbit();

dat=(j<<7)|(dat>>1);

}

return(dat);

}

void tempwritebyte(uchar dat)//向DS18B20写以字节的数据

{

uint i,j;

bit testb;

for(j=1;j<=8;j++)

{

testb=dat&0x01;

dat=dat>>1;

if(testb)//写1

{

ds=0;

i++;i++;

ds=1;

i=8;while(i>0)i--;

}

else//写0

{

ds=0;

i=8;while(i>0)i--;

ds=1;

i++;i++;

}

}

}

void tempchange()//启动温度转换

{

dsreset();

delay(1);

tempwritebyte(0xcc);

tempwritebyte(0x44);

}

float get_temp()//温度值读取与处理函数

{

uchar a,b;

dsreset();

delay(1);

tempwritebyte(0xcc);

tempwritebyte(0xbe);

a=tempread();

b=tempread();

temp=b;

temp<<=8;

temp=temp|a;

f_temp=(float)(temp*0.0625);

f_temp=f_temp*10;

return(f_temp);

}

void write_com(uchar com)//向12864写指令

{

rs=0;

wr=0;

delay(1);

P0=com;

lcden=1;

delay(1);

lcden=0;

delay(1);

}

void write_date(uchar date)//向12864写数据

{

rs=1;

wr=0;

delay(1);

P0=date;

lcden=1;

delay(1);

lcden=0;

delay(1);

}

void display(float m,uchar n)//显示设定温度、实测温度、加热状态

{

uint i,j;

float b;

float p;

uchar a1,a2,a3;

uchar b1,b2,b3,b4;

if(n<100)

{

a1=0;

a2=n/10;

a3=n;

}

else

{

a1=1;

a2=0;

a3=0;

}

p=m;

j=(uint)(p*10);

b1=(uchar)(j/1000);

b2=(uchar)(j00/100);

b3=(uchar)(j0/10);

b4=(uchar)(j);

write_com(0x90+5);//显示设定温度

write_date(0x30+a1);

write_date(0x30+a2);

write_date(0x30+a3);

write_com(0x88+5);//显示实测温度

write_date(0x30+b1);

write_date(0x30+b2);

write_date(0x2e);

write_date(0x30+b3);

write_date(0x30+b4);

b=((float)(b1*100+b2*10+b3))/10.0;

i=0;

if((b+0.2)

{

led1=0;

write_com(0x98+1);

while(table2[i]!='\0')

{

write_date(table2[i]);

i++;

}

flag2=1;

}

else

{

led1=1;

i=0;

write_com(0x98+1);

while(table8[i]!='\0')

{

write_date(table8[i]);

i++;

}

i=0;

if((b=n)||((b>n)&&((b-0.2)<=n))||((b=n)))

{

led2=0;

write_com(0x98+4);

while(table3[i]!='\0')

{

write_date(table3[i]);

i++;

}

}

}

if(flag2==1)

{

flag2=0;

led2=1;

i=0;

write_com(0x98+4);

while(table8[i]!='\0')

{

write_date(table8[i]);

i++;

}

}

}

void conversion()//定时器2初值处理函数

{

uint temp2;

temp2=65536-PWMH*10;

HighH=temp2/256;

HighL=temp2%6;

}

void senddate(float y)

{

// uint i;

if(flag==1)

{

ES=0;

flag=0;

c=0;

TI=1;

printf("The measured temp:%f",y);

// SBUF=1;

while(!TI);

TI=0;

ES=1;

}

}

void init()//初始化函数

{

uint i,j;

TMOD=0x21;

TH1=0xfd;

TL1=0xfd;

TH0=(65536-50000)/256;

TL0=(65536-50000)%6;

PWMH=0;

conversion();

TH2=(65536-50000)/256;

TL2=(65536-50000)%6;

rd=1;

lcden=0;

write_com(0x30);

write_com(0x0c);

write_com(0x01);

write_com(0x90);

while(table5[i]!='\0')//系统初始化

{

write_date(table5[i]);

i++;

delay(20);

}

for(j=0;j<=1;j++)//6个点的三次循环

{

write_com(0x88+4);

for(i=0;i<=5;i++)

{

write_date(0x2e);

delay(200);

}

delay(100);

write_com(0x88+4);

for(i=0;i<=5;i++)

{

write_date(0x20);

}

delay(100);

}

i=0;

write_com(0x80);//显示 水温控制系统设计标题

while(table7[i]!='\0')

{

write_date(table7[i]);

i++;

}

i=0;

write_com(0x90);//显示 设定温度

while(table[i]!='\0')

{

write_date(table[i]);

i++;

}

i=0;

write_com(0x88);//显示 实测温度

while(table1[i]!='\0')

{

write_date(table1[i]);

i++;

}

// tempwritebyte(0x4e);//设定DS18B20的分辨率为11位

// tempwritebyte(0x5f);

PWM=0;

e1=0;

e2=0;

e3=0;

duk=0;

uk=0;

KP=20;//PID控制算法参数

KI=0.061;

KD=30;

REN=1;//串口通信设置

SM0=0;

SM1=1;

ET0=1;

ET2=1;

TR0=1;

TR1=1;

TR2=1;//启动定时器2

EA=1;

ES=1;

}

void main()

{

init();

while(1)

{

keyscan();//调用键盘扫描函数

tempchange();//启动温度转换

t=get_temp();//提取实测温度

display(t,set_temp);//显示设定温度和实测温度

senddate(t);//向上位机发送数据函数

if((flag1==1))

{

if(timecount>=375)

{

timecount=0;

e1=set_temp-t;

duk=(KP*(e1-e2)+KI*e1+KD*(e1-2*e2+e3));//PID控制算法式

uk=uk+duk;

if(e1>=75)

{

z=4;

}

else if(e1>=50)

{

z=3;

}

else if(e1>=10)

{

z=2;

}

else

z=1;

}

if(uk>=2500)uk=2500;

if(uk<=0)uk=0;

if(uk<=0)

{

ET0=0;

ET2=0;

PWM=0;

}

else

{

ET0=1;

ET2=1;

PWMH=(uchar)uk;

k=(float)uk;

}

e3=e2;

e2=e1;

conversion();//调用定时器2初值处理函数

}

else

{

ET0=0;

ET2=0;

PWM=0;

}

}

}

void timer0() interrupt 1//定时器1中断

{

TH1=(65536-50000)/256;

TL1=(65536-50000)%6;

timecount++;

TH2=HighH;

TL2=HighL;

PWM=1;

}

void ser() interrupt 4//串口中断

{

RI=0;

c=SBUF;

flag=1;

}

void Timer2() interrupt 5//用定时器2控制PWM占空比

{

TF2=0;

PWM=0;

}