用51单片机实现的2路LM35模拟测温，3路DS18B20数字测温开关切换显示的时哪路温度，花了我很多时间.
仿真原理图如下（proteus仿真工程文件可到本帖附件中下载）
单片机源程序如下:
- #include <REGX51.H>
- #include "1602.H"
- #include "DS18B20.h"
- extern unsigned char ReadAdc0832(unsigned char channel);
- extern void DelayMs(unsigned char t);
- unsigned int Temp[5];//5路温度值温度放大10倍
- int DS18B20DATA[3];//DS18B20读到的16位数据
- code unsigned char DecimalNum[16]={0,1,1,2,3,3,4,4,5,6,6,7,8,8,9,9};//DS18B20小数部分对应的数
- unsigned char code DuanMa[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
- sbit LED=P3^1;
- sbit BEEP=P3^2;
- sbit LE=P3^0;
- sbit Key=P1^0;
- unsigned char CurID;
- // 显示段码值01234567
- unsigned char LCDbuf[16];
- void LM35Read(void)
- {
- Temp[0]=ReadAdc0832(0)*10;
- DelayMs(10);
- Temp[1]=ReadAdc0832(1)*10;
- DelayMs(10);
- }
- void DS18B20Read()
- {
- gettemp(DS18B20DATA);
- Temp[2]=(DS18B20DATA[0]>>4)*10+DecimalNum[DS18B20DATA[0]&0x0f];
- Temp[3]=(DS18B20DATA[1]>>4)*10+DecimalNum[DS18B20DATA[1]&0x0f];
- Temp[4]=(DS18B20DATA[2]>>4)*10+DecimalNum[DS18B20DATA[2]&0x0f];//环境温度
- }
- //格式化数据
- void ForamtData(int Data,unsigned char *Str)
- {
- unsigned char t;
- t=Data/10;
- if(t>99)
- {
- *Str++='1';
- *Str++=(t%100)/10+0x30;
- *Str++=(t%10)+0x30;
- *Str++='.';
- *Str++=Data%10+0x30;
- }
- if((t>9)&&(t<100))
- {
- *Str++=' ';
- *Str++=t/10+0x30;
- *Str++=(t%10)+0x30;
- *Str++='.';
- *Str++=Data%10+0x30;
- }
- if((t<10)&&(t>0))
- {
- *Str++=' ';
- *Str++=' ';
- *Str++=(t%10)+0x30;
- *Str++='.';
- *Str++=Data%10+0x30;
- }
- if(t==0)
- {
- *Str++=' ';
- *Str++=' ';
- *Str++=' ';
- *Str++='.';
- *Str++=Data%10+0x30;
- }
- *Str=0;
- }
- //报警
- void Warning(void)
- {
- unsigned char flag;//,//i;
- static unsigned int a,b;
- flag=0;
- a=Temp[4]+50;
- b=Temp[4]-50;
- //for(i=0;i<5;i++)
- //{
- flag=(Temp[CurID]>(a));
- flag=(Temp[CurID]<b)||flag;
- BEEP=!flag;
- LED=!flag;
- //}
- }
- void main(void)
- {
- LE=1;
- // _ASM
- // {
- // mov,r0,#1;
- // }
- P0=DuanMa[CurID+1];
- LE=0;
- LCD_Init();
- LCD_Write_String(0,0,"Envir: C");
- LCD_Write_String(5,1,"C ");
- LED=0;
- CurID=3;
- while(1)
- {
- LM35Read();
- DS18B20Read();
- LE=1;
- P0=DuanMa[CurID+1];
- LE=0;
- ……………………
- …………限于本文篇幅 余下代码请从51黑下载附件…………
所有资料51hei提供下载（仿真+源码）:
多路温度采集器.zip
(110.58 KB, 下载次数: 190)
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