用数码管与DS18B20设计温度报警器(共5页)

1、精选优质文档-倾情为你奉上#include<reg51.h>#include<intrins.h>#define uchar unsigned char#define uint unsigned intsbit DQ=P36;sbit BEEP=P37;sbit HI_LED=P14;sbit LO_LED=P15;bit HI_Alarm=0,LO_Alarm=0;bit DS18B20_IS_OK=1;uchar code DSY_CODE=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x00; /数码管共阴极

2、段码 uchar code df_Table=0,1,1,2,3,3,4,4,5,6,6,7,8,8,9,9; /温度小数位对照表uchar CurrentT=0; /温度整数部分uchar Display_Digit=0,0,0,0; /数码管待显示的各位温度uchar Temp_Value=0x00,0x00; /DS0832读取的温度值 uint Time0_Count=0; / 定时器中断计数char Alarm_Temp_HL2=70,-20;/*延时程序*/void Delay(uint x)while(-x);/*DS18B20初始化*/uchar Init_DS18B20()

3、uchar status; DQ=1;Delay(8); DQ=0;Delay(90); DQ=1;Delay(8); status=DQ; Delay(100); DQ=1; return status; /*DS18B20读字节*/ uchar ReadOneByte() uchar i,dat=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; /*DS18B20写字节*/ void Wr

4、iteOneByte(uchar dat) uchar i; for(i=0;i<8;i+) DQ=0;DQ=dat & 0x01;Delay(5); DQ=1; dat>>=1; /*从DS18B20读取温度*/ void Read_Temperature() if( Init_DS18B20()=1) DS18B20_IS_OK=0; else WriteOneByte(0xCC); WriteOneByte(0x44); Init_DS18B20(); WriteOneByte(0xCC); WriteOneByte(0xBE); Temp_Value0=Rea

5、dOneByte(); Temp_Value1=ReadOneByte(); DS18B20_IS_OK=1; /*给DS18B20设置报警值*/ 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(); Wr

6、iteOneByte(0xcc); /跳过序列号 WriteOneByte(0x48); /将温度报警值存入DS18B20/*温度值显示*/ void Display_Temperature() /显示温度uchar i;uchar t=150; /延时值uchar ng=0,np=0; /负数标示，及负号显示位置char Signed_Current_Temp;if(Temp_Value1&0xf8)=0xf8) /如果为负数，取反加1；设置负数标示及负号显示位置Temp_Value1=Temp_Value1;Temp_Value0=Temp_Value0+1;if(Temp_Val

7、ue0=0x00)Temp_Value1+;ng=1;np=0xfd;Display_Digit0=df_TableTemp_Value0&0x0f; /查表显示温度小数位CurrentT=(Temp_Value0&0xf0)>>4)|(Temp_Value1&0x07)<<4);Signed_Current_Temp=ng? -CurrentT : CurrentT;HI_Alarm= Signed_Current_Temp >= Alarm_Temp_HL0 ? 1:0;LO_Alarm= Signed_Current_Temp <

8、;= Alarm_Temp_HL1 ? 1:0;Display_Digit3=CurrentT/100;Display_Digit2=CurrentT%100/10;Display_Digit1=CurrentT%10;if(Display_Digit3=0) /高位为0，不现实，负号后移 Display_Digit3=10; np=0xfb; if(Display_Digit2=0) Display_Digit2=10; np=0xf7; for(i=0;i<30;i+)/刷新数码管显示温度值P0=0X39;P2=0X7F;Delay(t);P2=0XFF;P0=0X63;P2=0XB

9、F;Delay(t);P2=0XFF;P0=DSY_CODEDisplay_Digit0;P2=0XDF;Delay(t);P2=0XFF;P0=(DSY_CODEDisplay_Digit1)|0X80;P2=0XEF;Delay(t);P2=0XFF;P0=DSY_CODEDisplay_Digit2;P2=0XF7;Delay(t);P2=0XFF;P0=DSY_CODEDisplay_Digit3;P2=0XFB;Delay(t);P2=0XFF;if(ng)P0=0X40;P2=np;Delay(t);P2=0XFF;/*定时器0中断，控制报警声音*/ void T0_INT()in

10、terrupt 1 TH0=-1000/256; TL0=-1000%256; BEEP=!BEEP; if(+Time0_Count=400) Time0_Count=0; if(HI_Alarm)HI_LED=HI_LED; else HI_LED=1; if(LO_Alarm)LO_LED=LO_LED; else LO_LED=1; void main() IE=0X82; TMOD=0X01; /方式1计数 TH0=-1000/256; TL0=-1000%256; TR0=0; HI_LED=1; LO_LED=1; Set_Alarm_Temp_Value(); Read_Temperature(); Delay(50