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实时温度测量及显示,超出温度范围相应的继电器工作,继电器可以驱动相应的加 ,本数字温度报警器是基于51 单片机及温度传感器DS18B20来设计的,温度测量范围0到99.9摄氏度,精度为0.1摄氏度, 7 ~) }2 T" d( `! d0 Q+ r5 j3 ^( G
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元件清单
+ {6 p0 t& h& J* P6 h![]()
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% q+ |/ @; E) }: Y3 ^电路原理图
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# ~. G) ?( a$ P; k源程序
; G, D3 J% ]9 h#include<reg52.h> 8 n8 l, D9 _' C1 @; B) y
( h8 f6 F7 p. {0 T2 m0 J#include<intrins.h> # W. ?7 C, U' `8 W/ e
#include<math.h>
% T0 v9 s* [ G! @0 e#include<string.h> 2 I% P/ Y" Z2 i
struct PID {
# j8 D3 l, |' o+ O# d* i& u5 Yunsigned int SetPoint; // 设定目标 Desired Value ) V$ f A* ~# L; | e+ G9 B- |
unsigned int Proportion; // 比例常数 Proportional Const $ e! W; `6 R9 z3 B2 `' Z
unsigned int Integral; // 积分常数 Integral Const
6 f- x1 K& ^/ n" |& ]unsigned int Derivative; // 微分常数 Derivative Const
, l% d& y7 B/ e. g! M3 [- yunsigned int LastError; // Error[-1] ( t$ {4 Q9 ^0 [# n5 W. s
unsigned int PrevError; // Error[-2]
: F- U6 S9 o' k2 U. vunsigned int SumError; // Sums of Errors
6 X' V) B8 ^6 `) Y}; . k7 U& L% u0 Q0 z/ s
struct PID spid; // PID Control Structure
% h' t$ G" c5 kunsigned int rout; // PID Response (Output) 响应输出, N3 \4 V% _& L. z4 r9 H; T
unsigned int rin; // PID Feedback (Input)//反馈输入
9 h2 I( E6 `2 {' P6 ~ unsigned char high_time,low_time,count=0;//占空比调节参数 6 a0 x1 L5 u" e$ f4 u
#define uchar unsigned char: f8 z2 S, K! T& u
#define uint unsigned int, W! j0 ?) p" W O2 y5 g
sbit output=P1^0;
7 M; F8 d- q& x3 asbit ds=P3^2;
1 j1 {" `5 E7 d3 l, Nsbit DQ=P3^2;//ds18b20与单片机连接口
2 `1 d4 ~! O; Psbit lcden=P2^7;//LCE使能引脚
( ^3 c" a( S- T; I0 msbit lcdrs=P2^5;+ H! V* ~7 V, @! X
sbit lcdrw=P2^6;& t& B: j N' ?! _( D2 Q( C6 x1 Z9 q
sbit ledred=P1^6;/ y( j7 \- j# M; ]$ U2 X
sbit ledgreen=P1^7;0 Y; W1 _% \( Y
sbit key0=P2^0;//按键引脚
/ i8 N* B# z( t/ }. A' y, X0 Fsbit key1=P2^1;& ^) B0 A/ w* L6 m. j7 d- O
uchar set[2]={0};- e% o$ S. z# j
uchar code str1[]="now temp: C";! H& a4 o$ @# m: c2 T
uchar code str2[]="set temp: C";
0 _6 i3 I8 Z5 F8 m: Z1 W- N: i- luchar code table[]={0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39};
# u. ?; i/ [- N; y8 Xuchar n,num;
* ]/ c0 O% g- Q: A3 K* Kint set_temper=30,temper,temp; //温度变量定义, r2 t, ]( t2 `5 r) s
unsigned int s;; F0 `' E0 U. Y
float f_temp;//转换后的温度
7 t3 n( P$ f* ^' C6 zuint tvalue;
* l2 Y, ?' J2 K z: G( Muchar tflag;//温度正负标志
6 s* \9 a y7 Svoid delay(i)//延时函数# U$ g' [1 n8 j. t- h
{
; B2 q2 @2 A7 t$ d0 q9 X6 n uint j;2 M" m5 W5 D* |5 b8 k& U9 ]
for(i;i>0;i--)9 V# R: D7 k. z4 \
for(j=110;j>0;j--);. ]0 E/ s7 S, H2 \
}
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void wr_com(uchar ml)//写命令: h1 C' z! S9 S) k
{$ P8 A$ ^% O' L. I! W
lcdrs=0;4 A: q9 ^& x7 n; h
P0=ml;
2 {; {$ V; _9 V8 \ delay(5);+ ^, m; n n7 C) W; H$ j
lcden=1;1 H* s; u+ G% o( s- ^9 Q0 h
delay(5);
" q9 e& f7 O+ _# C) l& d: J3 Z lcden=0;
# B N1 N) t9 E- |}. S* B R3 ^: B0 x# o# V4 B+ e
/ m$ J8 \ ]6 M$ J8 @$ gvoid wr_data(uchar shuju)//写数据; n: D0 _6 x7 z, x4 R
{
( b& t& H% \& N5 Q; g. a lcdrs=1;
3 W/ ^2 d6 d* A) c& R! _' c' P //lcden=1;
& o' {1 `+ H) y; ~- V1 O3 J$ ]6 v% U P0=shuju;
) Q" }' X+ S6 h7 C( c delay(5);0 l t$ p9 s' E
lcden=1;: J9 O% }4 M# j6 y7 S0 g
delay(5);1 { o/ q, X& U, d, f8 ?1 c$ ]
lcden=0;% ~1 x ~' q5 c# L) Q! ~
}
: y8 `3 Z& {9 tvoid init() //按照时序操作的初始化
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/ B6 ]; h l4 L$ `+ i3 I. r7 E lcdrw=0;
/ D) ^; e, z; ~ wr_com(0x38);//显示模式设置,设置为16*2显示,5*7点阵,八位数据口
& n. x0 D3 s* p3 B+ z( x+ } wr_com(0x0c);//开显示,但不开光标,光标不闪9 H& e" Y1 @% W4 _0 ]3 `
wr_com(0x06);//显示光标移动设置
! { _. k; L9 P3 |: c: {) G: v wr_com(0x01);// 清屏' m2 i/ D) s5 B* @5 |/ ^1 _- ~, h
wr_com(0x80); // 数据指针初始化1 I6 F g$ S+ U( f8 O9 n C* q
for(num=0;num<16;num++)
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0 q& I/ ^+ h4 l G! z( I$ M9 { wr_data(str1[num]);//now temp3 f: r6 C0 B; {0 J/ m; N, O
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wr_com(0x80+0x40); //地址初始化7 \" E7 D, _- t! l: A$ e/ Z! f# H
for(num=0;num<16;num++)9 e+ @' Z! M, [
{, W. _" G' \1 X
wr_data(str2[num]);//set temp
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/*************************DS1820程序****************************/$ z) |3 }' R: D; z5 B
void delay_18B20(unsigned int i)//延时1微秒
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2 P6 ^$ E* T ~2 s# e! @ while(i--);. E2 f( T- @5 d
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void ds1820rst(void)/*ds1820复位*/
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' Q# f% |! m O# e4 V$ O, L! S unsigned char x=0;6 j' Z: V9 i# f+ v# z4 n
DQ = 1; //DQ复位
$ I5 y8 G k4 n* j delay_18B20(4); //延时
5 z P6 I( E6 a' n DQ = 0; //DQ拉低3 h4 t# b+ h O# A4 S/ B9 v) }
TR0=0;1 I! _8 X: ?" Q: X' ?
delay_18B20(100); //精确延时大于
1 \( m; f; Y' C$ b9 g$ _ TR0=1;. s+ r" E& ]3 J0 n
DQ = 1; //拉高
8 K9 E" \+ y, N+ v" z9 | delay_18B20(40); 0 P) \ K) D9 A! |7 Y* h+ ]
}
2 n- f- v; N4 p* P% ~7 l* @. f, buchar ds1820rd(void)/*读数据*// p" ^ ~- ^4 Q; a7 L1 U9 P) ?
{
$ I/ E$ J% s$ p. t unsigned char i=0;/ ~# u/ w3 D$ x& n2 ~0 \. C
unsigned char dat = 0;
4 G" G- b3 v: O' h% H: o9 w# O% i TR0=0;, a8 W8 p1 b1 e8 w' w
for (i=8;i>0;i--)* t2 g- W6 |' s/ c
{
6 b. r6 l% o, E! ]# V! L H DQ = 0; //给脉冲信号
2 u8 a+ S' I9 M' B* ?' e; ~ dat>>=1;; ~+ q6 ]" F) s& b9 G* f4 J
DQ = 1; //给脉冲信号
, m0 V0 T$ G( s. S/ E; k( t7 M if(DQ)
: ^" H% ?, V' }9 W) g5 G dat|=0x80;
8 o- W, E* T( h6 }# a: \ delay_18B20(10);
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return(dat);3 W9 g* {$ x( `( O4 Q3 H
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void ds1820wr(uchar wdata)/*写数据*/+ x7 Z) O# `7 z% Z2 I4 W. o
{
! I: p6 _( I3 b4 q unsigned char i=0;
/ m2 ]$ P! ~5 [' L* f TR0=0;- C- u9 b. k2 h) w* y6 I8 G: q5 I
for (i=8; i>0; i--)
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7 j" E" [& f- j6 h$ H7 y- f DQ = 0;
! A5 s* T! L E- H+ W7 @ DQ = wdata&0x01;
9 v. E/ t( p8 P delay_18B20(10);9 a9 ]9 }1 E; k6 [9 v
DQ = 1;# e2 `/ I# E! }0 P0 j6 _& z& }
wdata>>=1;
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uint get_temper()//获取温度. N1 s) y5 y e, S7 \* \- V4 ^
{ 8 \7 m4 I+ A' v4 i8 R
7 Q8 H9 t1 _% T/ Z' T) A' } uchar a,b;
; N. j! P2 Y7 c/ ^' p4 I* m$ j ds1820rst(); 3 P2 a- p% s/ N9 h" Q2 t( X
ds1820wr(0xcc);//*跳过读序列号*/
! q% I. `# ^4 M( ^# R! h H" l ds1820wr(0x44);//*启动温度转换*/
& t* H* L( M. b) @) z ds1820rst();
( o. Y, s$ D$ o- g ds1820wr(0xcc);//*跳过读序列号*/ 4 l0 P5 f& r" A0 r9 ^2 V
ds1820wr(0xbe);//*读取温度*/ % p3 B0 D/ h# J
a=ds1820rd();$ v/ Q9 p p8 d7 D+ n. i
b=ds1820rd();9 O4 W+ d Z4 u
3 {! n) i' @, T2 G' x tvalue=b;
9 Z3 B6 y* A+ ~' n/ ` tvalue<<=8;( S+ n3 b# X" S6 F, H/ i
tvalue=tvalue|a;
7 a- R3 B5 s0 n5 t/ X m- {' p TR0=1;
L% V2 Q, L- A j2 v+ U3 z* n if(tvalue<0x0fff) tflag=0;
9 e: K) }, g7 z/ w else {tvalue=~tvalue+1;tflag=1;}8 H/ `! P; C& A
tvalue=tvalue*(0.625);//温度值扩大10倍,精确到1位小数
4 p6 O0 ^9 U7 ]2 w* L) D5 T temp=tvalue;( o% j+ _! I2 k1 \0 |
return temp;
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# x$ G* f `4 Z
; E; |. P `( D/ a) y; qvoid dis_temp(int t)//显示温度, a1 Q* ? d0 W1 }: d
{
+ ^! Q7 |" i, B: W* B3 h8 Y uchar d0,d1,d2,d3;- ]% ?; \4 K4 k
//t=26;
# z. h% `0 {" [# e' @. t if(tflag==0)' O5 M, E q1 X. S
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d0=t/1000+0x30;; a+ b" ^/ l4 M% Q6 o1 r6 p
d1=t%1000/100+0x30;
, a% }% x8 h b W d2=t%100/10+0x30;# I! c& w3 u6 E" Y1 v/ O
d3=t%10+0x30;
% P5 q( u1 |( H+ Z if(d0==0x30)7 ~4 K: x6 C/ C( z, w& C
{+ Z5 y& q# C7 K& k% u9 j; G8 e1 | M
wr_com(0x80+9);0 Z+ ?, u! n" a; |7 u
wr_data(d1);
w6 [9 i9 T& w* B8 { wr_com(0x80+10);
( X" w! a0 J" T8 x wr_data(d2);- b" W8 r5 {2 c6 k
wr_com(0x80+11);
# K2 P) Z& w- h5 n; R wr_data(0x2e);
6 N/ t5 H2 t: u5 Q& V7 X wr_com(0x80+12);
& \4 ]4 u" C! e; r6 \; f, { wr_data(d3);: L3 T7 i0 r2 n, w
}
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{
! c" E7 Z1 p/ T. Z g& Y0 }% o) F wr_com(0x80+9);- e6 l1 L* L& o" ^! l
wr_data(d0);
& T( a; U4 [* }& V9 \7 f wr_com(0x80+10);/ F L+ ~4 A8 p9 j
wr_data(d1);9 e( H' |0 {+ t2 m) D
wr_com(0x80+11);
. m# a" V5 y; F& j- v o wr_data(d2);* y- [& \3 @ j# g* t: _; T
wr_com(0x80+12);
/ t& b# `& I5 ^9 |1 `8 P wr_data(' ');
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else$ X7 E* J2 c8 {, t5 C
{
: e) I+ h- ^) E$ Q wr_com(0x80+9);
% B! `/ E! I7 W$ L" c) K0 D: k wr_data('-'); f0 w0 i% \/ a7 Z8 q
wr_com(0x80+10);
% T8 c3 M! _/ k6 x wr_data(d1);1 x0 F; y* v& ^# y, g0 u
wr_com(0x80+11);, r1 t8 E2 q+ g" m h+ J
wr_data(d2);
5 q5 I- X* v6 w9 Z% h. L- t k wr_com(0x80+12);
9 p, m. J! l/ [( F3 w9 u8 o5 P. G wr_data(' ');2 @* u, m3 H7 ~& E
//wr_com(0x80+12);
- ~1 i0 V% L$ G) m4 S5 V //wr_data(d3);
# e$ `! }" o3 G' ] }
9 K$ f$ h; \+ I' k+ t/ m* A wr_com(0x80+14);0 }4 Z8 P+ v* [$ x! a, z& y5 U
wr_data(0xdf);
6 X+ c/ C2 M$ Y P temper=t/10;) ~" n+ d' O% d) B
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- [5 ^1 t, m- E+ f2 Avoid keyscan()//键盘扫描8 Z, \- t- M# X& X
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if(key0==0)4 U1 u6 |4 c; E. \) g
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delay(1);
3 T5 H" g B+ V- \9 k if(key0==0)5 V9 f9 a; Z+ y, Y
{
2 p7 ~; q$ N8 @. e. i. w6 Z s3 z while(!key0);
: Q" J4 V7 k7 d$ J delay(1);' b3 q: z( m# C( x1 e! G+ \
while(!key0);
8 p1 v3 M% j) Y$ V+ K6 @ set_temper++;
- F; ?' }. b7 w6 |/ L }
( L1 S3 M3 g" V7 m3 ]: E set[0]=set_temper/10; //获得设置温度显示值
: `! S) X, G5 `8 k) F# Q; S! A set[1]=set_temper%10;, ^& t2 U, H! o. X2 b
wr_com(0x80+0x40+9);
# D; P, [4 [7 Y# M7 I wr_data(table[set[0]]);3 B) N# O* A% [5 Y2 a$ L- q" i
delay(1);
% s1 B& h4 N$ r( R/ i: f! W3 Y+ u% J wr_com(0x80+0x40+10);
6 V3 T+ _& L- u3 D2 I( v wr_data(table[set[1]]);; C% x1 t9 l ^" n. \& b% w
delay(1);7 D6 r7 {5 q9 y# o% D" m# V. O
//wr_com(0x80+0x40+11);% E& W1 X6 ~0 F4 @. ]
//wr_data(0x2e);* ~( r! u! f% O
//wr_com(0x80+0x40+14);
8 N" f3 `- {) A: m! i //wr_data(0xdf);
) \2 y1 n! R+ y* r delay(1);0 g4 g; X/ f0 M( e: ^
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if(key1==0)
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delay(3);//延时去抖$ U6 y ~( n) \& N, N
if(key1==0)1 W y9 T4 m) \9 b {
{+ f, A# ^" A, m( ^" _ ]* m
while(!key1);
# \( n$ V% ^4 W, |2 M delay(3);
" {6 ^' d5 H3 X while(!key1);2 q4 Q' F |: f6 T+ J" D3 U/ \
set_temper--;//温度减! B9 G0 e9 X) J& C
if(set_temper==0)& p* Y( I8 G7 K% o/ F! ~3 P
{set_temper=0;}# ^, [1 k9 A; _2 ~' n" {+ E
}
( s; q `7 Q" o- @ 9 e C$ b# n! U& t
set[0]=set_temper/10; //获得设置温度显示值 N+ S: e" {! ]9 C- \
set[1]=set_temper%10;
" J% A7 n9 p- J wr_com(0x80+0x40+9); //显示设置温度值! G' G0 D4 Y" s7 R8 A* B
wr_data(table[set[0]]);8 U% T l$ k* V" {/ s2 C
delay(1);
- f6 [$ X7 {3 d. v# M. O wr_com(0x80+0x40+10);
$ ]/ F# k2 F" Q. [ F2 [ wr_data(table[set[1]]);
- o5 W6 P" K2 F# a' |9 Q delay(1);! z0 T) H2 F! z4 v
//wr_com(0x80+0x40+11);- }: W* I+ O; ~$ P( [5 L+ Y
//wr_data(0x2e);8 |: b3 |% w# ]* W$ a- C
wr_com(0x80+0x40+14);
# x: k/ Z0 `; J$ E wr_data(0xdf);" |8 e0 [' I1 ^) y( m( k
delay(1);1 }% _- h, k, k' V: N4 o
}
: C) t, z# p' D}
# n2 ?9 G' J' F$ qvoid PIDInit (struct PID *pp)
' P5 @1 w5 B8 y# g{ # E. |7 v/ n+ K
memset ( pp,0,sizeof(struct PID)); //用参数0初始化pp% I' m4 R2 y0 Q
} Q4 H- S+ P1 K A
2 M( N8 k4 [4 w2 P6 J8 g6 cunsigned int PIDCalc( struct PID *pp, unsigned int NextPoint ) //PID计算
0 ~* S) ]* Y( K0 P7 L n% f" O: j{
+ I/ N. E0 @' X9 z" p unsigned int dError,Error;
0 w) {2 ^! w! U3 }7 o: X Error = pp->SetPoint - NextPoint; // 偏差 & P5 U7 |2 i- S, H# U. h% i
pp->SumError += Error; // 积分 8 {. @9 O( P+ e# s4 D$ ^
dError = pp->LastError - pp->PrevError; // 当前微分 3 J, n7 r) M( s* Q- s7 n0 I6 R
pp->PrevError = pp->LastError;
! Y; q( _% Z, X& R' B( S pp->LastError = Error;
; x' }+ M6 _% e; \ return (pp->Proportion * Error//比例+ c2 f0 f5 G1 r! `6 H6 U4 g
+ pp->Integral * pp->SumError //积分项7 N2 K1 j: S" _1 a
+ pp->Derivative * dError); // 微分项 : L1 k7 z5 `5 t* S
}
; }5 n3 U2 m/ K( r+ i+ E7 w2 @/***********************************************************
& e* b/ l7 A3 b, M温度比较处理子程序 " V) a" E) b6 m2 d
***********************************************************/ 2 Z! P. I" L; F# C5 Q4 j
void compare_temper(void)
, ^& _/ M$ B Z1 J$ ?( @; V* k$ F{ . k8 A% i" {4 w- i' b* u- F
unsigned char i; 4 C$ @$ @. a! Q7 X* N6 q
if(set_temper>temper) //设置温度大于当前温度
/ s- J6 B! ?+ h" c6 I. W, Y {
& `; a& I' I7 ?6 e% b5 C( e ledred=0;
1 }& r, x d4 i4 ~ ledgreen=1;0 e9 m1 n$ X3 c/ J
if(set_temper-temper>1) //温度相差1度以上
* j1 M/ E" ~9 b0 A" U, t {
) X. Z( Y) A1 C' ] high_time=100; 8 }4 j% u% K7 e5 T- u. Y' J
low_time=0;' R1 j7 X7 H( M8 M
} : }! T3 u3 g! M7 d; o$ f
else //设置温度不大于当前温度
0 D6 t; i) j% \/ M# J( A {
- a0 z2 O4 a6 R for(i=0;i<10;i++) # R6 a) l' }0 D ?9 {
{ ' ?5 ]- L; }. q8 W1 l% T4 Y
get_temper(); $ C9 Q* J9 O/ f. z
rin = s; // Read Input
5 o8 C+ x4 B$ V' @ rout = PIDCalc ( &spid,rin ); // PeRForm PID Interation
* B7 G, N( e6 o- W. y a1 n# J } ) d3 A. x. |3 A0 V5 c3 Y
if (high_time<=100) high_time=(unsigned char)(rout/800); , _% Z/ Q- N; d1 ~; Q
else high_time=100; . O1 n! H, |5 G' c' S! h7 j3 c+ f2 Z' m
low_time= (100-high_time); , X, Q& Z( o$ i
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}
- N0 p# o; D! B( D. b; ` else if(set_temper<=temper) //设置温度不大于当前温度# D4 M2 N# R+ Z7 g0 ^8 w7 k# f
{ : {6 D6 S3 B( n& Z! g
ledred=1;
) h9 ]2 ^1 T. j6 p* S, L4 a0 H+ s ledgreen=0;
- H# I( {* |1 q9 R! ]' s1 s+ Y. b4 L if(temper-set_temper>0) //温度相差0度以上
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high_time=0; 2 W: |" D0 `8 S) Q* i+ }
low_time=100; 4 b5 n$ ^% ?# p5 s; B! ]
} # P& n; e% D+ _: F" W! B1 T( L
else
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for(i=0;i<10;i++) ( a$ \; v/ B* S. y
{ ; J' P. n7 q( ^4 Z3 g9 M T! I4 ~
get_temper();
: P3 g i- P% R! ^9 E" x, u rin = s; // Read Input
* q- r2 c9 c3 p( |4 {4 z rout = PIDCalc ( &spid,rin ); // Perform PID Interation
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if (high_time<100) high_time=(unsigned char)(rout/10000); 3 y; I* }& b3 [( T8 a8 f! d( f0 H3 V
else high_time=0; ' D) a. g! E: G8 c1 m! u% l7 @
low_time= (100-high_time); 9 z* K e w2 h v
} , @/ W+ [8 }/ ~! Q/ u8 W3 E) b# k
}
5 \* T& b* e; J$ Q7 B* \/ \* p} 9 W' @- {3 ~* U0 _0 S
/***************************************************** ' t1 `# ^7 v4 _
T0中断服务子程序,用于控制电平的翻转 ,40us*100=4ms周期
+ T" [2 |8 q: a3 P6 ^( }" J f- G******************************************************/ ) M& E0 `% f9 j: F4 _7 V5 W8 m
void serve_T0() interrupt 1 using 1 4 v! u k% m$ d( Y* w& k
{
2 _5 D N, s& T, \/ w if(++count<=(high_time)) output=0;8 k+ Z( A1 B! c. u( G; @! @2 E4 V
else if(count<=100)
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output=1; - K/ l5 \- u0 A0 k# w J1 E
}
) S- r, `; R6 W; \ else count=0; ! u4 `/ F; }& ^
TH0=0x2f; * l! U$ H8 L# a) d$ H* i
TL0=0x40;
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7 I" s* X# r# e z# m& o1 r; Y3 i) |: H6 A5 S. C. y
/***********主函数**********// l8 K6 K% \" x! f8 K
void main(void)' I0 m, H$ x: f$ Q' M
{( u; o1 r2 O" m+ i$ f
unsigned char i;
+ j( R6 J6 x/ G& ~" W init();//LCD初始化
! c" b+ A1 N# p3 r7 ^# M9 y- G A TMOD=0x01;
7 V6 e" F$ r1 K TH0=0x2f;
$ Z( L. d9 _7 l+ W% M TL0=0x40;
/ f2 ?& e: @' W# w* L( ?+ ] EA=1;
# ]3 N B2 d- P% m ET0=1;; x% K5 Q4 e% i) ^6 ^9 p
TR0=1;- g' |1 I0 T2 \+ g
high_time=50; ' Y- [: w; G" U$ h1 ], C# [/ S9 h- ]+ S
low_time=50; * E8 ` t1 ]; Y) r/ r' Y3 N% W: u
PIDInit ( &spid ); // Initialize Structure " E- u" k8 W$ I( ] }8 g
spid.Proportion= 10; // Set PID Coefficients
" s9 i3 d/ p8 e1 H% G* b. l spid.Integral = 8; ) m6 [+ m1 v1 m2 e! n2 }6 ^
spid.Derivative =6; 1 C% S5 v" X4 v
spid.SetPoint =100; // Set PID Setpoint
, y& Y7 k- J& o set[0]=set_temper/10;
2 y/ O. k0 O" l s1 B% b1 Y! y set[1]=set_temper%10;& n/ n7 c9 J; O
wr_com(0x80+0x40+9); //显示设置温度- n1 R' `& s, [5 \0 |8 x4 `* ^
wr_data(table[set[0]]);
. s( B" k" f$ b delay(1);
4 G- u' Q7 c/ |, E wr_com(0x80+0x40+10);6 j" `+ u( A& k4 O
wr_data(table[set[1]]);+ d" j* C; L% C o
delay(1);
. w) q1 S& Z6 a: T; E0 Y wr_com(0x80+0x40+14); //显示温度符号 p- Q4 N1 M2 U3 r f( k" z5 q
wr_data(0xdf);+ G5 y. f: g+ @
delay(1);6 F* o2 n+ D+ P4 I* G
while(1)1 F1 v/ P: A6 g; `# v C+ G4 ^
{
5 z9 W6 m, W0 X% \' k+ g2 f keyscan(); //按键扫描 {, Y1 M7 ~2 v: Z+ [# m' \% O
for(i=0;i<10;i++) //循环10次
- u+ Z0 {# m( {: B' A, w {5 U" p( |! c( T5 t! o
dis_temp(get_temper()); //显示温度值4 `1 S8 A8 ]" \2 M0 d
if((key0==0)||(key1==0)) break; //如果有按键退出显示循环6 j d9 U5 k% h8 |7 M5 M
}, M# V5 U8 J: M9 l: K6 I
if((key0!=0)&&(key1!=0)) compare_temper(); //比较温度; D5 h+ W/ E$ l7 D
}" {! ?, g6 v/ t k4 @$ @
}
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D$ t4 g5 W3 `! y- H( W/ |; x7 d s
4 C) p3 f0 j- l9 \3 f5 Q. l
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- d6 `" ?2 u& \9 M+ Y) S; E
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