有相關電子知識的話,自己DIY一個數位溫度控製器,控溫精度0.5℃,採用AT89C2051 MCU.綫路圖不知道怎么上傳,C程式如下:
/*-------------------------------
温度控制器V1.51
显示为三个共阳极LED
温度传感器用单总线DS18B20
CPU为2051，三个按键，分别为UP，DOWN，SET
温度调节上限为125度，下限为-55度
只能用于单只18B20
本软件仅供DIY使用
silentguiding@21cn.com-------------------------------*/
#include <AT89X051.H>
#include <intrins.h>
#define Key_UP P3_0 //上调温度
#define Key_DOWN P3_1 //下调温度
#define Key_SET P1_7 //设定键（温度设定，长按开电源）
#define RelayOutPort P3_5 //继电器输出
#define LEDPort P1 //LED控制口
#define LEDOneC P3_2 //LED DS1控制（百位）
#define LEDTwoC P3_3 //LED DS2控制（十位）
#define LEDThreeC P3_4 //LED DS3控制（个位）
#define TMPort P3_7 //DS1820 DataPort
unsigned char code LEDDis[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0xFF,0xBF}; //0-9的LED笔划,0xFF为空,0xF7为负号
static unsigned char bdata StateREG; //可位寻址的状态寄存器
sbit DS1820ON = StateREG^0; //DS1820是否存在
sbit SetTF = StateREG^1; //是否是在温度设置状态
sbit KeySETDown = StateREG^2; //是否已按过SET键标识
sbit PowTF = StateREG^3; //电源电源标识
sbit KeyTF = StateREG^4; //键盘是否允许
//sbit KeySETDowning = StateREG^5; //SET是否正在按下
static unsigned char bdata TLV _at_ 0x0029; //温度变量高低位
static unsigned char bdata THV _at_ 0x0028;
static signed char TMV; //转换后的温度值
static unsigned char KeyV,TempKeyV; //键值
static signed char TMRomV _at_ 0x0027; //高温限制
static signed char TMSetV _at_ 0x0026; //温度设定值
static unsigned char KSDNum; //SET键连按时的采集次数
static unsigned char IntNum,IntNum2,IntNum3; //中断发生次数，IntNum用于SET长按检测，IntNum2用于设定状态时LED闪烁
static signed char LED_One,LED_Two,LED_Three; //LED的显示位 LED_One为十位，LED_Two为个位
static unsigned char Sign; //负号标识
void main(void)
{
void InitDS1820(void); //定义函数
void ROMDS1820(void);
void TMVDS1820(void);
void TMRDS1820(void);
void TMWDS1820(void);
void TMREDS1820(void);
void TMERDS1820(void);
void ReadDS1820(void);
void WriteDS1820(void);
void Delay_510(void);
void Delay_110(void);
void Delay_10ms(void);
void Delay_4s(void);
void V2ToV(void);
StateREG = 0; //初始化变量
SetTF = 1;
PowTF = 1; //关电源
THV = 0;
TLV = 0;
TMV = 0;
KeyV = 0;
TempKeyV = 0;
KSDNum = 0;
IntNum = 0;
IntNum2 = 0;
IntNum3 = 0;
LED_One = 0;
LED_Two = 0;
InitDS1820(); //初始化
ROMDS1820(); //跳过ROM
TMERDS1820(); //E2PRAM中温度上限值调入RAM
InitDS1820(); //初始化
ROMDS1820(); //跳过ROM
TMRDS1820(); //读出温度指令
ReadDS1820(); //读出温度值和上限值
TMSetV = TMRomV; //拷贝保存在DS18B20ROM里的上限值到TMSetV
EA = 1; //允许CPU中断
ET0 = 1; //定时器0中断打开
TMOD = 0x1; //设定时器0为模式1，16位模式
TH0=0xB1;
TL0=0xDF; //设定时值为20000us（20ms）
TR0 = 1; //开始定时
while(1);
}
//定时器0中断外理中键扫描和显示
void KeyAndDis_Time0(void) interrupt 1 using 2
{
TH0=0xB1;
TL0=0xDF; //设定时值为20000us（20ms)
LEDPort = 0xFF;
if (!Key_UP)
KeyV = 1;
if (!Key_DOWN)
KeyV = 2;
if (!Key_SET)
KeyV = 3;
//KeySETDowning = 0; //清除
if (KeyV != 0) //有键按下
{
Delay_10ms(); //延时防抖 按下10ms再测
if (!Key_UP)
TempKeyV = 1;
if (!Key_DOWN)
TempKeyV = 2;
if (!Key_SET)
TempKeyV = 3;
if (KeyV == TempKeyV) //两次值相等为确定接下了键
{
if (KeyV == 3) //按下SET键，如在SET状态就退出，否则进入
{
//KeySETDowning = 1; //表明SET正在按下
PowTF = 0; //电源标识开
if (!KeyTF)
if (SetTF)
{
SetTF = 0; //标识位标识退出设定
InitDS1820(); //初始化
ROMDS1820(); //跳过ROM
TMWDS1820(); //写温度上限指令
WriteDS1820(); //写温度上限到DS18B20ROM
WriteDS1820(); //写温度上限到DS18B20ROM
WriteDS1820(); //写温度上限到DS18B20ROM
InitDS1820(); //初始化
ROMDS1820(); //跳过ROM
TMREDS1820(); //温度上限值COPY回E2PRAM
}
else
SetTF = 1;
if (!KeySETDown) //没有第一次按下SET时，KeySETDown标识置1
KeySETDown = 1;
else
KSDNum = KSDNum + 1; //前一秒内有按过SET则开始计数
}
if (SetTF) //在SET状态下
{
if ((KeyV == 1) && (!KeyTF))
TMSetV = TMSetV + 1; //上调温度
if ((KeyV == 2) && (!KeyTF))
TMSetV = TMSetV - 1; //下调温度
if (TMSetV <= -55) //限制温度上下限
TMSetV = -55;
if (TMSetV >= 125)
TMSetV = 125;
}
if ((!KeyTF) && (IntNum3 == 0)) KeyTF = 1; //当键盘处于可用时，锁定
}
if (KeySETDown) //在2秒内按下了SET则计中断发生次数用于长按SET时计时用
IntNum = IntNum + 1;
if (IntNum > 55) //中断发生了55次时（大约1.2秒）75为1.5秒左右
{
IntNum = 0;
KeySETDown = 0;
if (KSDNum == 55) //如一直长按了SET1.2秒左右
{
RelayOutPort = 1; //关闭继电器输出
PowTF = 1; //电源标识关
LEDOneC = 0;
LEDTwoC = 0;
LEDThreeC = 0;
LEDPort = 0xBF; //显示"--"
Delay_4s(); //延时
LEDOneC = 1;
LEDTwoC = 1; //关显示
LEDThreeC = 1;
Delay_4s();
IntNum = 0;
IntNum2 = 0;
IntNum3 = 0;
}
KSDNum = 0;
}
}
KeyV = 0;
TempKeyV = 0; //清空变量准备下次键扫描
if (!PowTF)
{
InitDS1820(); //初始化
ROMDS1820(); //跳过ROM
TMVDS1820(); //温度转换指令
Delay_510();
Delay_510(); //延时等待转换完成
InitDS1820(); //初始化
ROMDS1820(); //跳过ROM
TMRDS1820(); //读出温度指令
ReadDS1820(); //读出温度值
V2ToV(); //转换显示值
if (TMV > TMSetV) //根据采集到的温度值控制继电器
{
RelayOutPort = 0;
}
else
{
RelayOutPort = 1;
}
if (SetTF) IntNum2 = IntNum2 + 1; //用于闪烁计数
if (IntNum2 > 50 ) IntNum2 = 0;
if (KeyTF) IntNum3 = IntNum3 + 1; //用于防止按键连按
if (IntNum3 > 25)
{
IntNum3 = 0;
KeyTF = 0;
}
if ((SetTF) && (IntNum2 < 25)) goto InitEnd; //计数在后半段时显示
LEDPort = LED_One;
LEDOneC = 0;
Delay_510();
LEDOneC = 1; //显示百位数
LEDPort = LED_Two;
LEDTwoC = 0;
Delay_510();
LEDTwoC = 1; //显示十位数
LEDPort = LED_Three;
LEDThreeC = 0;
Delay_510();
LEDThreeC = 1; //显示个位数
}
InitEnd:;
}
void V2ToV(void) //数值转换
{
TLV = TLV >> 4;
THV = THV << 4; //读出的高低位数值移位
TMV = TLV | THV; //合并高低位放入TM为实际温度值
Sign = 0;
if (SetTF || !Key_SET)
Sign = TMSetV >> 7; //取符号
else
Sign = TMV >> 7;
if (Sign)
{
if (SetTF || !Key_SET)
{
LED_One = (~(TMSetV-1)) / 100; //SET状态下显示设定值
LED_Two = ((~(TMSetV-1)) - LED_One * 100)/10;
LED_Three = (~(TMSetV-1)) - LED_One * 100 - LED_Two * 10;
}
else
{
LED_One = (~(TMV-1)) / 100; //转换百位值
LED_Two = ((~(TMV-1)) - LED_One * 100)/10;
LED_Three = (~(TMV-1)) - LED_One * 100 - LED_Two * 10;
}
}
else
{
if (SetTF || !Key_SET)
{
LED_One = (TMSetV) / 100; //SET状态下显示设定值
LED_Two = (TMSetV - LED_One * 100)/10;
LED_Three = TMSetV - LED_One * 100 - LED_Two * 10;
}
else
{
LED_One = (TMV) / 100; //转换百位值
LED_Two = (TMV - LED_One * 100)/10;
LED_Three = TMV - LED_One * 100 - LED_Two * 10;
}
}
//转LED字段
if (LED_One) //超过百时十位的处理
LED_Two = LEDDis[LED_Two];
else
{
if (LED_Two == 0)
LED_Two = LEDDis[10];
else
LED_Two = LEDDis[LED_Two];
}
if (Sign)
LED_One = LEDDis[11];
else
{
if (LED_One == 0)
LED_One = LEDDis[10];
else
LED_One = LEDDis[LED_One];
}
LED_Three = LEDDis[LED_Three];
}
void InitDS1820(void) //初始化DS1820
{
TMPort = 1; //拉高TMPort
_nop_(); //保持一个周期
TMPort = 0; //拉低TMPort
Delay_510(); //延时 DS1820复位时间要500us的低电平
TMPort = 1; //拉高TMPort
_nop_(); //保持
_nop_();
_nop_();
Delay_110(); //延时110us 等待DS1820回应
if (!TMPort) //回应信号为低电平
DS1820ON = 1;
else
DS1820ON = 0;
Delay_110(); //延时
Delay_110();
TMPort = 1; //拉高TMPort
}
void ROMDS1820(void) //跳过ROM匹配
{
#pragma asm
MOV A,#0CCH
MOV R2,#8
CLR C
WR1:
CLR P3_7
MOV R3,#6
DJNZ R3,$
RRC A
MOV P3_7,C
MOV R3,#23
DJNZ R3,$
SETB P3_7
NOP
DJNZ R2,WR1
SETB P3_7
#pragma endasm
}
void TMVDS1820(void) //温度转换指令
{
#pragma asm
MOV A,#44H
MOV R2,#8
CLR C
WR2:
CLR P3_7
MOV R3,#6
DJNZ R3,$
RRC A
MOV P3_7,C
MOV R3,#23
DJNZ R3,$
SETB P3_7
NOP
DJNZ R2,WR2
SETB P3_7
#pragma endasm
}
void TMRDS1820(void) //读出温度指令
{
#pragma asm
MOV A,#0BEH
MOV R2,#8
CLR C
WR3:
CLR P3_7
MOV R3,#6
DJNZ R3,$
RRC A
MOV P3_7,C
MOV R3,#23
DJNZ R3,$
SETB P3_7
NOP
DJNZ R2,WR3
SETB P3_7
#pragma endasm
}
void TMWDS1820(void) //写入温度限制指令
{
#pragma asm
MOV A,#04EH
MOV R2,#8
CLR C
WR13:
CLR P3_7
MOV R3,#6
DJNZ R3,$
RRC A
MOV P3_7,C
MOV R3,#23
DJNZ R3,$
SETB P3_7
NOP
DJNZ R2,WR13
SETB P3_7
#pragma endasm
}
void TMREDS1820(void) //COPY RAM to E2PRAM
{
#pragma asm
MOV A,#48H
MOV R2,#8
CLR C
WR33:
CLR P3_7
MOV R3,#6
DJNZ R3,$
RRC A
MOV P3_7,C
MOV R3,#23
DJNZ R3,$
SETB P3_7
NOP
DJNZ R2,WR33
SETB P3_7
#pragma endasm
}
void TMERDS1820(void) //COPY E2PRAM to RAM
{
#pragma asm
MOV A,#0B8H
MOV R2,#8
CLR C
WR43:
CLR P3_7
MOV R3,#6
DJNZ R3,$
RRC A
MOV P3_7,C
MOV R3,#23
DJNZ R3,$
SETB P3_7
NOP
DJNZ R2,WR43
SETB P3_7
#pragma endasm
}
void WriteDS1820(void) //写入温度限制值
{
#pragma asm
MOV A,26H //发出4EH写ROM指令后连发两个字节分别为上下限
MOV R2,#8
CLR C
WR23:
CLR P3_7
MOV R3,#6
DJNZ R3,$
RRC A
MOV P3_7,C
MOV R3,#23
DJNZ R3,$
SETB P3_7
NOP
DJNZ R2,WR23
SETB P3_7
#pragma endasm
}
void ReadDS1820(void) //读出温度值
{
#pragma asm
MOV R4,#3 ; 将温度高位和低位，高温限制位从DS18B20中读出
MOV R1,#29H ; 低位存入29H(TEMPER_L),高位存入28H(TEMPER_H)，高温限制位存入27H(TMRomV)
RE00:
MOV R2,#8
RE01:
CLR C
SETB P3_7
NOP
NOP
CLR P3_7
NOP
NOP
NOP
SETB P3_7
MOV R3,#09
RE10:
DJNZ R3,RE10
MOV C,P3_7
MOV R3,#23
RE20:
DJNZ R3,RE20
RRC A
DJNZ R2,RE01
MOV @R1,A
DEC R1
DJNZ R4,RE00
#pragma endasm
}
void Delay_510(void) //延时510微秒
{
#pragma asm
MOV R0,#7DH
MOV R1,#02H
TSR1:
DJNZ R0,TSR1
MOV R0,#7DH
DJNZ R1,TSR1
#pragma endasm
}
void Delay_110(void) //延时110微秒
{
#pragma asm
MOV R0,#19H
MOV R1,#02H
TSR2:
DJNZ R0,TSR2
MOV R0,#19H
DJNZ R1,TSR2
#pragma endasm
}
void Delay_10ms(void) //延时10ms
{
#pragma asm
MOV R0,#19H
MOV R1,#0C8H
TSR3:
DJNZ R0,TSR3
MOV R0,#19H
DJNZ R1,TSR3
#pragma endasm
}
void Delay_4s(void) //延时4s
{
#pragma asm
MOV R2,#28H
TSR5:
MOV R0,#0FAH
MOV R1,#0C8H
TSR4:
DJNZ R0,TSR4
MOV R0,#0FAH
DJNZ R1,TSR4
DJNZ R2,TSR5
#pragma endasm
}
