单片机PID水温控制程序.doc

单片机PID水温控制程序#include<>#include<>#include<>#include<>#defineZ55sbitP27=P2^7;sbittemp=P2^0;sbitP21=P2^1;sbitP22=P2^2;uintnnn;uchart_min,t_minf,t_sec,t_ge,shii,gee,shiff;ucharuk_qian,uk_bai,uk_shi,uk_ge;//uk显示位uinttime;uintz_uk;ucharw_shi,w_ge,w_shif,w_baif;//实际温度数字显示;ucharq_ge,q_shif,q_baif;//占空比显示位ucharidatabai,shi,ge;//预设温度数字显示;bitw_fh;//实际值符号位;uinttvalue;//10倍实际温度。uintp=20000;uintf,g;//floatidatabfb;//占空比设定。ucharset_temp=60;floatidatatemperature;ucharidatacount=1;ucharidatacont=500;ucharidataxx;voidrst18b20(){temp=1;delay10us(1);temp=0;delay10us(70);//延时916us。temp=1;delay10us(20);//延时266us。}voidwritedata(uchardat)//向ds18b20写数据。{uchari;for(i=0;i<8;i++){temp=0;temp=dat&0x01;delay10us(10);temp=1;dat>>=1;//先写低位。}}ucharreaddata()//从ds18b20读数据。{uchardat;uchari;for(i=0;i<8;i++){temp=0;dat>>=1;//先读低位。temp=1;if(temp)dat=dat|0x80;delay10us(10);//延时136us;temp=1;}return(dat);}voidreadtemperature(){uchartemperh,temperl;rst18b20();writedata();//跳过读rom命令直接给器件发命令。writedata(0x44);//启动ds18b20读取温度。rst18b20();//必须二次复位。writedata();writedata(0xbe);temperl=readdata();//读取温度低字节。temperh=readdata();//读取温度高字节。tvalue=temperh;tvalue<<=8;tvalue=tvalue|temperl;//组成16位合成字。if(tvalue<0x0fff)//是否为正数。w_fh=0;else//负数转换程序。{w_fh=1;tvalue=~tvalue+1;}temperature=tvalue*;tvalue=(tvalue*);//温度转换,强制转换成整形数。w_shi=tvalue/1000;//十位w_ge=tvalue%1000/100;//个位w_shif=tvalue%100/10;//shifen位w_baif=tvalue%10;//baifenwei}voidinit(){P27=1;TMOD=0x11;TH0=0x3c;//50ms采样一次;TL0=0xb0;//TH1=0x9c;//TL1=0x9c;TH1=(65536-1000)/256;TL1=(65536-1000)%256;EX0=1;IT0=1;ET0=1;TR0=1;ET1=1;TR1=1;}voidrupttime1()interrupt3{/*if(--f==0){P27=0;}if(--p==0){P27=1;p=20000;f=g;}*/TH1=(65536-1000)/256;TL1=(65536-1000)%256;nnn++;if(nnn==g){P27=0;}if(nnn==1000){P27=1;nnn=0;}}voidrupttime0()interrupt1{ucharmin,sec;TH0=0x3c;//50ms采样一次;TL0=0xb0;readtemperature();if(--count==0){time++;//执行时间t_min=time/60;//分min=t_min;//保持t_min=t_min/10;//分十位t_minf=min%10;//分个位t_sec=time%60;//秒sec=t_sec;//保持t_sec=t_sec/10;//秒十位t_ge=sec%10