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显示上限温度：
显示实时温度：
显示下限温度：
原理图：
单片机源程序如下:
- #include "reg51.h"
- #define uchar unsigned char
- #define uint unsigned int
- sbit DQ=P1^4; //温度数据口
- sbit wx1=P2^4; //位选1
- sbit wx2=P2^5; //位选2
- sbit wx3=P2^6; //位选3
- sbit wx4=P2^7; //位选4
- sbit sd=P1^2; //范围与显示开关 =1 范围
- sbit sj=P2^1; //上下界切换 =1 上限
- sbit ss=P2^2; //加1
- sbit xj=P2^3; //减1
- sbit bjs=P1^0; //上限报警
- sbit bjx=P1^1; //下限报警
- unsigned int temp, temp1, temp2, xs;
- unsigned int sx = 30;
- unsigned int xx = 20;
- uchar code table[] = {0xc0, 0xf9, 0xa4, 0xb0, 0x99, //共阳极数码管
- 0x92, 0x82, 0xf8, 0x80, 0x90, 0x88, 0x83, 0xc6};
- /*******延时程序*******/
- void delay1( unsigned int m )
- { //1ms
- unsigned int i, j;
- for(i = m; i > 0; i--)
- for(j = 110; j > 0; j--);
- }
- void delay( unsigned int m )
- { //1us
- while(m--);
- }
- void Init_DS18B20()
- {
- unsigned char x = 0;
- DQ = 1; //DQ复位DS18B20通信端口
- delay(8); //稍作延时
- DQ = 0; //单片机将DQ拉低
- delay(80); //精确延时 大于480us
- DQ = 1; //拉高总线
- delay(4);
- x = DQ; //稍作延时后，如果x=0则初始化成功，x=1则初始化失败
- delay(20);
- }
- /*********DS18B20读一个字节*********/
- uchar ReadOneChar()
- {
- unsigned char i = 0;
- unsigned char dat = 0;
- for(i = 8; i > 0; i--)
- {
- DQ = 0; //高电平拉成低电平时读周期开始
- dat >>= 1;
- DQ = 1; //给脉冲信号
- if(DQ)
- dat |= 0x80;
- delay(4);
- }
- return dat;
- }
- /*********DS18B20写一个字节*********/
- void WriteOneChar( unsigned char dat )
- {
- unsigned char i = 0;
- for(i = 8; i > 0; i--)
- {
- DQ = 0; //从高电平拉低至低电平，写周期开始
- DQ = dat & 0x01; //数据的最低位先写入
- delay(5); //60us到120us延时
- DQ = 1;
- dat >>= 1; //从最低位到最高位传入
- }
- }
- /*********读取DS18B20当前温度*********/
- void ReadTemperature()
- {
- unsigned char a = 0;
- unsigned b = 0;
- unsigned t = 0;
- Init_DS18B20();
- WriteOneChar( 0xCC ); //跳过读序号列号的操作
- WriteOneChar( 0x44 ); //启动温度转换
- delay(5); //
- Init_DS18B20();
- WriteOneChar( 0xCC ); //跳过读序号列号的操作
- WriteOneChar( 0xBE ); //读取温度寄存器等（共可读9个寄存器）前两个就是温度
- delay(5);
- a = ReadOneChar(); //读取温度值低位
- b = ReadOneChar(); //读取温度值高位
- temp1 = b << 4; //高8位中后三位数的值
- temp1 += ((a & 0xf0) >> 4); //低8位中的高4位值加上搞8位中后三位数的值 temp1室温整数值
- temp2 = a & 0xf0; //小数的值
- temp = ((b*256 + a) >> 4); //当前采集温度值除16得实际温度值
- xs = temp2*0.0625*10; //小数位，若为0.5则算5来显示
- }
- void wenduxianshi()
- {
- wx1 = 1;
- P0 = table[temp/10]; //显示十位
- delay1(1);
- wx1 = 0;
- wx2 = 1;
- P0 = table[temp%10] + 0x80; //显示个位 加上0x80就显示小数点了
- delay1(1);
- wx2 = 0;
- wx3 = 1;
- P0 = table[xs%10]; //显示小位
- delay1(1);
- wx3 = 0;
- wx4 = 1;
- P0 = table[12]; //显示C字符
- delay1(1);
- wx4 = 0;
- }
- void sxxianshi()
- {
- wx1 = 1;
- P0 = table[sx/10]; //显示十位
- delay1(1);
- wx1 = 0;
- wx2 = 1;
- P0 = table[sx%10]+0x80; //显示个位
- delay1(1);
- wx2 = 0;
- wx3 = 1;
- P0 = table[12]; //显示小位
- delay1(1);
- wx3 = 0;
- wx4 = 1;
- P0 = table[5]; //显示C字符
- delay1(1);
- wx4 = 0;
- }
- void xxxianshi()
- {
- wx1 = 1;
- P0 = table[xx/10]; //显示十位
- delay1(1);
- wx1 = 0;
- wx2 = 1;
- P0 = table[xx%10]+0x80; //显示个位
- delay1(1);
- wx2 = 0;
- wx3 = 1;
- P0 = table[12]; //显示小位
- delay1(1);
- wx3 = 0;
- wx4 = 1;
- P0 = table[12]; //显示C字符
- delay1(1);
- wx4 = 0;
- }
- void dsx()
- {
- if(ss == 0){ delay1(5); if(ss == 1) sx = sx + 1; }
- if(xj == 0){ delay1(5); if(xj == 1) sx = sx - 1; }
- }
- void dxx()
- {
- if(ss == 0){ delay1(5); if(ss == 1) xx = xx + 1; }
- if(xj == 0){ delay1(5); if(xj == 1) xx = xx - 1; }
- }
- void alarm()
- {
- delay1(5);
- if( temp > sx )
- bjs = 1;
- if( temp < xx )
- bjx = 1;
- }
- void normal()
- {
- if( temp > xx )
- bjx = 0;
- if( temp < sx )
- bjs = 0;
- }
- void main()
- ……………………
- …………限于本文篇幅 余下代码请从51黑下载附件…………
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温度测量与控制系统设计.rar
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