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/************* main.c ******************/
#include <reg51.h>
#define uchar unsigned char
#define uint unsigned int
#include "18b20.c"
#include<pid.c>
uchar count,high_time;
uchar set;
uchar code dis_7[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
main()
{
uint t;
TMOD=0x01;
TH0 =0x20;
TL0 =0x00;
EA = 1;
ET0 = 1;
TR0 = 1;
set=32;
init_pid();
while(1)
{
t=ReadTemperature();
if(t>999)
{
P0=dis_7[t/1000];
P3=0xfe;
delay(200);
P0=dis_7[(t%1000)/100];
P3=0xfd;
delay(200);
}
else
{
P0=dis_7[t/100];
P3=0xfd;
delay(200);
}
P0=(dis_7[(t%100)/10]&0x7f);
P3=0xfb;
delay(200);
P0=dis_7[t%10];
P3=0xf7;
duty_cycle(t);
}
}
//---------------------------------------------------------------
void t0_int(void) interrupt 1 //PWM波輸出
{
if(++count<=(high_time))
SWH=0;
else if(count<=100)
SWH=1;
else
count=0;
TH0=0x10; //定時(shí)器初始化
TL0=0x10;
}
/************* pid.c ******************/
uchar set; //溫度初始值
uint rout; // PID Response (Output)
uchar high_time,count=0; //占空比調(diào)節(jié)參數(shù)
/*************PID**********************************/
struct PID {
uint SetPoint; // 設(shè)定目標(biāo) Desired Value
uint Proportion; // 比例常數(shù) Proportional Const
uint Integral; // 積分常數(shù) Integral Const
uint Derivative; // 微分常數(shù) Derivative Const
signed int LastError; // Error[-1]
signed int PrevError; // Error[-2]
signed int SumError; // Sums of Errors
};
struct PID spid; // PID Control Structure
/****************pid初始化*********************/
void init_pid()
{
high_time=50;
spid.Proportion = 23; // Set PID Coefficients
spid.Integral = 2;
spid.Derivative =6;
spid.SetPoint = set; // Set PID Setpoint
}
/***************************PID算法**************************/
unsigned int PIDCalc( struct PID *pp, unsigned int NextPoint )
{
signed int dError,Error;
Error = pp->SetPoint - NextPoint; // 偏差
pp->SumError += Error; // 積分
dError = pp->LastError - pp->PrevError; // 當(dāng)前微分
pp->PrevError = pp->LastError;
pp->LastError = Error;
return (pp->Proportion * Error+ pp->Integral * pp->SumError + pp->Derivative * dError);
}
/********************PID控制占空比*************************/
//high_time表示高電平數(shù)
void duty_cycle(uint t) // 占空比
{
uchar s;
t=t/10;
s=set;
if(s>t)
{
if(s-t>2)
high_time=100;
else
{
rout = PIDCalc ( &spid,t ); // Perform PID Interation
if(high_time<=100)
high_time=(uchar)(rout/600);
else
high_time=100;
}
}
else
{
high_time=0;
}
}
/************* 18b20.c ******************/
sbit DQ = P2^7; //定義DS18B20數(shù)據(jù)線
sbit SWH = P2^4; //PWM開關(guān)
sbit BEEP = P2^1; //蜂鳴器
void delay(unsigned int t)
{
while(t--)
;
}
void Init_DS18B20(void)//初始化ds1820
{
unsigned char x=0;
DQ = 1; //DQ復(fù)位
delay(8); //稍做延時(shí)
DQ = 0; //單片機(jī)將DQ拉低
delay(80); //精確延時(shí) 大于 480us
DQ = 1; //拉高總線
delay(14);
x=DQ; //稍做延時(shí)后如果x=0則初始化成功 x=1則初始化失敗
delay(20);
}
/******************************************************************************/
unsigned char ReadOneChar(void)//讀一個(gè)字節(jié)
{
unsigned char i=0;
unsigned char dat = 0;
for (i=8;i>0;i--)
{
DQ = 0; // 給脈沖信號
dat>>=1;
DQ = 1; // 給脈沖信號
if(DQ)
dat|=0x80;
delay(4);
}
return(dat);
}
/******************************************************************************/
void WriteOneChar(unsigned char dat)//寫一個(gè)字節(jié)
{
unsigned char i=0;
for (i=8; i>0; i--)
{
DQ = 0;
DQ = dat&0x01;
delay(5);
DQ = 1;
dat>>=1;
}
}
/******************************************************************************/
uint ReadTemperature(void)//讀取溫度
{
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