基于单片机的温度报警系统+proteus仿真

1、#include<reg51.h>#include<intrins.h>#define uchar unsigned char#define uint unsigned int#define delayNOP() _nop_();_nop_();_nop_();_nop_();sbit HI_LED=P23; /高温，低温白净闪烁 LEDsbit LO_LED=P26;sbit DQ=P33; /DS18B20数据线sbit BEEP=P37; /报警sbit RS=P20; sbit RW=P21; sbit EN=P22; sbit K1=P17; /正常显示温度，

2、越界时报警sbit K2=P14; /显示报警温度sbit K3=P11; /查看 ROM CODEuchar code RomCodeStr="- ROM CODE -"uchar RomCode8=0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00; /64位ROM CODEuchar code Temp_Disp_Title ="Current Temp: "uchar Current_Temp_Display_Buffer="TEMPE: "uchar code Temperature_Char8=

3、0x0c,0x12,0x12,0x0c,0x00,0x00,0x00,0x00; /温度示字符uchar code Alarm_Temp="ALARM TEMP Hi Lo"uchar Alarm_HI_LO_STR="Hi: Lo: "uchar temp_data2=0x00,0x00;uchar temp_alarm2=0x00,0x00;uchar display5=0x00,0x00,0x00,0x00,0x00,; /温度值uchar display13=0x00,0x00,0x00; /温度报警值uchar code df_Table=0,

4、1,1,2,3,3,4,4,5,6,6,7,8,8,9,9; /温度小数位对照表/./报警温度上下限（取值范围：-128+127）（DS18B20温度范围为：-55+125）/数组中前一位为高温值，后一位为低温值/此处类型注意设为char,否则不能进行有符号数的比较char Alarm_Temp_HL2=70,-20;/.uchar CurrentT=0; /当前读取温度整数部分uchar Temp_Value=0x00,0x00;/从DS18B20读取的温度值uchar Display_Digit=0,0,0,0;/待显示的各温度数位bit HI_Alarm=0,LO_Alarm=0; /高

5、低温报警标志bit DS18B20_IS_OK=1; /传感器正常标志uint Time0_Count=0; /定时器延时累加/./延时/.void DelayXus(int x) uchar i; while(x-)for(i=0;i<200;i+);/. /忙检测bit LCD_Busy_Check()bit LCD_Status;RS=0;/寄存器选择RW=1;/读状态寄存器EN=1;/开始读DelayXus(1);LCD_Status=(bit)(P0&0x80) ;EN=0;return LCD_Status;/写LCD指令void Write_LCD_Command(

6、uchar cmd) while(LCD_Busy_Check()&0x80)=0x80); /忙等待 RS=0; /写选择命令寄存器 RW=0; /写 EN=0; P0=cmd; EN=1; DelayXus(1); EN=0;/向LCD写数据void Write_LCD_Data(uchar dat) while(LCD_Busy_Check()&0x80)=0x80); /忙等待 RS=1;RW=0;EN=0;P0=dat;EN=1; DelayXus(1); EN=0;/设置液晶显示位置void Set_LCD_POS(uchar pos) Write_LCD_Comm

7、and(pos |0x80);/LCD初始化void LCD_Initialise() Write_LCD_Command(0x38);DelayXus(1); Write_LCD_Command(0x01); /清屏DelayXus(1); Write_LCD_Command(0x06); /字符进入模式：屏幕不动，字符后移DelayXus(1); Write_LCD_Command(0x0C); /显示开，关光标DelayXus(1); /././自定义字符写CGRAM/.void Write_NEW_LCD_Char() uchar i; Write_LCD_Command(0x40);

8、 /写CGRAM for(i=0;i<8;i+) Write_LCD_Data(Temperature_Chari); /写入温度符号/./延时/.void Delay(uint num) while(-num);/./初始化DS18B20/.uchar Init_DS18B20() uchar status; DQ=1;Delay(8); DQ=0;Delay(90); DQ=1;Delay(8); status=DQ; Delay(100); DQ=1; return status; /初始化成功时返回0/./读一节/.uchar ReadOneByte() uchar i,dat=

9、0; DQ=1;_nop_(); for(i=0;i<8;i+) DQ=0;dat>>=1;DQ=1;_nop_(); _nop_(); if(DQ) dat |=0x80;Delay(30);DQ=1; return dat;/./写一字节/.void WriteOneByte(uchar dat) uchar i; for(i=0;i<8;i+) DQ=0;DQ=dat&0x01;Delay(5);DQ=1;dat>>=1; /./读取温度值/.void Read_Temperature() if(Init_DS18B20()=1) /DS18B

10、20故障 DS18B20_IS_OK=0; else WriteOneByte(0xCC); /跳过序列号 WriteOneByte(0x44); /启动温度转换 Init_DS18B20(); WriteOneByte(0xCC); /跳过序列号 WriteOneByte(0xBE); /读取温度寄存器 Temp_Value0=ReadOneByte(); /温度低8位 Temp_Value1=ReadOneByte(); /温度高8位 Alarm_Temp_HL0=ReadOneByte(); /报警温度TH Alarm_Temp_HL1=ReadOneByte(); /报警温度TL DS

11、18B20_IS_OK=1; /./设置DS18B20温度报警值/.void Set_Alarm_Temp_Value() Init_DS18B20(); WriteOneByte(0xCC); /跳过序列号 WriteOneByte(0x4E); /将设定的温度报警值写入DS18B20 WriteOneByte(Alarm_Temp_HL0); /写TH WriteOneByte(Alarm_Temp_HL1); /写TL WriteOneByte(0x7F); /12位精度 Init_DS18B20(); WriteOneByte(0xCC); /跳过序列号 WriteOneByte(0x

12、48); /温度报警值存入DS18B20/./在LCD上显示当前温度/.void Display_Temperature() uchar i; uchar t=150; /延时值 uchar ng=0; /负数标识 char Signed_Current_Temp;/如果为负数则取反加1，并设置负数标识if(Temp_Value1&0xF8)=0xF8) Temp_Value1=Temp_Value1; Temp_Value0=Temp_Value0+1; if(Temp_Value0=0x00) Temp_Value1+; ng=1; /设负数标识/查表得到温度小数部分Display

13、_Digit0=df_TableTemp_Value0&0x0F;/获取温度整数部分（无符号）CurrentT=(Temp_Value0&0xF0)>>4)|(Temp_Value1&0x07)<<4);/有符号的当前温度值，注意此处定义为char, 其值可为-128+127Signed_Current_Temp=ng?-CurrentT:CurrentT;/高低温报警标志设置（与定义为char类型的Alarm_Temp_HL比较，这样可区分正负比较）HI_Alarm=Signed_Current_Temp>=Alarm_Temp_HL0?

14、1:0;LO_Alarm=Signed_Current_Temp<=Alarm_Temp_HL1?1:0;/将整数部分分解为三位待显示数字Display_Digit3=CurrentT/100;Display_Digit2=CurrentT%100/10;Display_Digit1=CurrentT%10;/刷新LCD显示缓冲Current_Temp_Display_Buffer11=Display_Digit0+'0'Current_Temp_Display_Buffer10='.'Current_Temp_Display_Buffer9=Displa

15、y_Digit1+'0'Current_Temp_Display_Buffer8=Display_Digit2+'0'Current_Temp_Display_Buffer7=Display_Digit3+'0'/高位为0时不显示if(Display_Digit3=0) Current_Temp_Display_Buffer7=' '/高位为0且次高位为0时，次高位不显示if(Display_Digit2=0&&Display_Digit3=0)Current_Temp_Display_Buffer8='

16、'/负数符号显示恰当位置if (ng) if(Current_Temp_Display_Buffer8=' ') Current_Temp_Display_Buffer8='_' else if(Current_Temp_Display_Buffer7=' ') Current_Temp_Display_Buffer7='_' else Current_Temp_Display_Buffer6='_'/在第一行显示标题Set_LCD_POS(0X00);for(i=0;i<16;i+) Write_L

17、CD_Data( Temp_Disp_Titlei);/在第二行显示当前温度Set_LCD_POS(0X40);for(i=0;i<16;i+) Write_LCD_Data(Current_Temp_Display_Bufferi);/显示温度符号Set_LCD_POS(0X4D);Write_LCD_Data(0x00);Set_LCD_POS(0X4E);Write_LCD_Data('C');/./定时器中断，控制报警声音/.void T0_INT() interrupt 1 TH0=-1000/256; TL0=-1000%256; BEEP=!BEEP; if

18、(+Time0_Count=400) Time0_Count=0; if(HI_Alarm) HI_LED=HI_LED; else HI_LED=0; if(LO_Alarm) LO_LED=LO_LED; else LO_LED=0; TR0=0;/./ROM CODE转换与显示/.void Display_Rom_Code() uchar i,t; Set_LCD_POS(0x40); for(i=0;i<8;i+) t=(RomCodei&0xF0)>>4); if(t>9) t+=0x37;else t+='0' Write_LCD_D

19、ata(t); /高位数显示 t=RomCodei&0x0F; if(t>9) t+=0x37;else t+='0' Write_LCD_Data(t); /低位数显示 /./读64位序列码/.void Read_Rom_Code() uchar i; Init_DS18B20(); WriteOneByte(0x33); /读序列码 for (i=0;i<8;i+) RomCodei=ReadOneByte();/./显示ROM CODE/.void Display_RomCode() uchar i; Set_LCD_POS(0x00); for(i=

20、0;i<16;i+) /显示标题 Write_LCD_Data(RomCodeStri); Read_Rom_Code(); /读64位序列码 Display_Rom_Code(); /显示64位ROM CODE/./显示报警温度/.void Disp_Alarm_Temperature() uchar i,ng;/显示Alarm_Temp_HL数组中的报警温度值/由于Alarm_Temp_HL类型为char，故可以直接进行正负比较/高温报警值. ng=0; if(Alarm_Temp_HL0<0) /如果为负数则取反加1 Alarm_Temp_HL0=Alarm_Temp_HL0

21、+1; ng=1;/分解高温各数位到待显示串中Alarm_HI_LO_STR4=Alarm_Temp_HL0/100+'0'Alarm_HI_LO_STR5=Alarm_Temp_HL0/10%10+'0'Alarm_HI_LO_STR6=Alarm_Temp_HL0%10+'0'/屏蔽高位不显示的0if(Alarm_HI_LO_STR4='0') Alarm_HI_LO_STR4=' 'if(Alarm_HI_LO_STR4=' '&& Alarm_HI_LO_STR5='

22、0') Alarm_HI_LO_STR5=' '/"-"符号显示if (ng) if (Alarm_HI_LO_STR5=' ') Alarm_HI_LO_STR5='-' else if(Alarm_HI_LO_STR4=' ') Alarm_HI_LO_STR4='-' else Alarm_HI_LO_STR3='-'/低温报警值ng=0;if(Alarm_Temp_HL1<0) /如果为负数则取反加1 Alarm_Temp_HL1=Alarm_Temp_HL

23、1+1; ng=1;/分解低温各数位到待显示串中Alarm_HI_LO_STR12=Alarm_Temp_HL1/100+'0'Alarm_HI_LO_STR13=Alarm_Temp_HL0/10%10+'0'Alarm_HI_LO_STR14=Alarm_Temp_HL0%10+'0'/屏蔽高位不显示的0if(Alarm_HI_LO_STR12='0') Alarm_HI_LO_STR12=' 'if(Alarm_HI_LO_STR12=' '&& Alarm_HI_LO_STR13='0') Alarm_HI_LO_STR13=' '/"-"符号显示if (ng) if (Alarm_HI_LO_STR13=' ') Alarm_HI_LO_STR13='-' else if(Alarm_HI_LO_STR12=' ') Alarm_HI_LO_STR12='-' else Alarm_HI_LO_STR11='-'/显示高低温报警温度值Set_LCD_POS(0x00); /显示