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align=middle>利用PID算法和PWM調制實現溫度自動控制的源程序</TD></TR>
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<TD align=middle><A href="http://ilovec.123ye.com/">葉風</A> ycitsj
（2005-08-09 08:53）</TD></TR>
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<P>#include<reg51.h><BR>#include<intrins.h><BR>#include<math.h><BR>#include<string.h><BR>struct
PID {<BR>unsigned int SetPoint; // 設定目標 Desired Value<BR>unsigned
int Proportion; // 比例常數 Proportional Const<BR>unsigned int Integral;
// 積分常數 Integral Const<BR>unsigned int Derivative; // 微分常數
Derivative Const<BR>unsigned int LastError; // Error[-1]<BR>unsigned
int PrevError; // Error[-2]<BR>unsigned int SumError; // Sums of
Errors<BR>};<BR>struct PID spid; // PID Control
Structure<BR>unsigned int rout; // PID Response (Output)<BR>unsigned
int rin; // PID Feedback (Input)</P>
<P>sbit data1=P1^0;<BR>sbit clk=P1^1;<BR>sbit plus=P2^0;<BR>sbit
subs=P2^1;<BR>sbit stop=P2^2;<BR>sbit output=P3^4;<BR>sbit
DQ=P3^3;<BR>unsigned char flag,flag_1=0;<BR>unsigned char
high_time,low_time,count=0;//占空比調節參數<BR>unsigned char
set_temper=35; </P>
<P>unsigned char temper;
<BR>unsigned char i;<BR>unsigned char j=0;<BR>unsigned int
s;<BR>/***********************************************************<BR>延時子程序,延時時間以12M晶振為準,延時時間為30us×time<BR>***********************************************************/<BR>void
delay(unsigned char time)<BR> {<BR> unsigned char
m,n;<BR>
for(n=0;n<time;n++)<BR>
for(m=0;m<2;m++){}<BR>
}<BR>/***********************************************************<BR>寫一位數據子程序<BR>***********************************************************/<BR>void
write_bit(unsigned char bitval)<BR> {<BR>
EA=0;<BR>
DQ=0; /*拉低DQ以開始一個寫時序*/<BR>
if(bitval==1)<BR>
{<BR>
_nop_();<BR>
DQ=1; /*如要寫1，則將總線置高*/<BR>
}<BR>
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