可设定上下限温控程序

1、/*-段P0，位P2。接线从低端开始，段a-h对应P0.0-P0.7.位1,2.对应 P2.0-P2.7 -*/单片机:89CS52/晶振：12MH #include <AT89X52.h>#include "DS18B20.h"#define schar signed char#define uint unsigned int#define uchar unsigned char /宏定义sbit SET=P31; /定义调整键sbit DEC=P32; /定义减少键sbit ADD=P33; /定义增加键sbit jiawen=P36; /定义加温bit s

2、hanshuo_st; /闪烁间隔标志bit beep_st; /加温间隔标志uchar x=0; /计数器schar m,PD; /温度值全局变量uchar n; /温度值全局变量uchar set_st=0; /状态标志schar shangxian=50; /上限报警温度，默认值为50schar xiaxian=25; /下限报警温度，默认值为25ucharcode LEDData= 0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0XD8,0x80,0x90;/共阳码code LEDData1=0x40,0x79,0x24,0x30,0x19,0x12,0x02,

3、0x78,0x00,0x10;/共阳码/*延时子程序*/void Delay(uint num)while( -num );/*初始化定时器0*/void InitTimer()TMOD=0x1;TH0=0x3c;TL0=0xb0; /50ms（晶振12M）/*定时器0 中断服务程序*/void timer0(void) interrupt 1TH0=0x3c;TL0=0xb0;x+;/*外部中断0 服务程序*/void int0(void) interrupt 0EX0=0; /关外部中断0if(DEC=0&&set_st=1) if(DEC=0)Delay(80);/500

4、 if(DEC=0)shangxian-; do while(DEC=0);Delay(80);/while(DEC=0);if(shangxian<xiaxian) shangxian=xiaxian;else if(DEC=0&&set_st=2) if(DEC=0) Delay(80);/if(DEC=0)xiaxian-;do while(DEC=0);Delay(80);/while(DEC=0);if(xiaxian<0)xiaxian=0; /*外部中断1 服务程序*/void int1(void) interrupt 2EX1=0; /关外部中断1i

5、f(ADD=0&&set_st=1) if(ADD=0)Delay(80); /500if(ADD=0) shangxian+; do while(ADD=0);Delay(80);/500 while(ADD=0); if(shangxian>=99) shangxian=99;else if(ADD=0&&set_st=2) if(ADD=0)Delay(80); /if(ADD=0) xiaxian+;do while(ADD=0);Delay(80);/500while(ADD=0); if(xiaxian>shangxian)xiaxian

6、=shangxian;/*读取温度*/void check_wendu()uint a,b,c;c=ReadTemperature()-5; /获取温度值并减去DS18B20 的温漂误差a=c/100; /计算得到十位数字b=c/10-a*10; /计算得到个位数字m=c/10; /计算得到整数位n=c-a*100-b*10; /计算得到小数位if(m<0)m=0;n=0; /设置温度显示下限if(m>99)m=99;n=9; /设置温度显示上限/*显示开机初始化等待画面*/Disp_init()P0 = 0xbf; /显示-P2 = 0xf7;Delay(200);P2 = 0x

7、fb;Delay(200);P2 = 0xfd;Delay(200);P2 = 0xfe;Delay(200);P2 = 0xff; /关闭显示/*显示温度子程序*/Disp_Temperature() /显示温度P0 =0xc6; /显示CP2 = 0xfe;Delay(200);P0 =LEDDatan; /显示个位P2 = 0xfd;Delay(200);P0 =LEDData1m%10; /显示十位P2 = 0xfb;Delay(200);P0 =LEDDatam/10; /显示百位P2 = 0xf7;Delay(200);P2 = 0xff; /关闭显示/*显示报警温度子程序*/Di

8、sp_alarm(uchar baojing)P0 =0xc6; /显示CP2 = 0xfe;Delay(200);P0 =LEDDatabaojing%10; /显示十位P2 = 0xfd;Delay(200);P0 =LEDDatabaojing/10; /显示百位P2 = 0xfb;Delay(200);if(set_st=1)P0 =0x89;else if(set_st=2)P0 =0xc7; /上限H、下限L 标示P2 = 0xf7;Delay(200);P2 = 0xff; /关闭显示/*加降温子程序*/void Alarm()if(x>=0) beep_st=beep_s

9、t; x=0; /if(m>=shangxian&&beep_st=1)|(m<xiaxian&&beep_st=1)/jiawen=0; /else /上下限两头加温，中间不加温/jiawen=1;if(m>=shangxian) /大于上限停止jiawen=1;if(m<=xiaxian)/当降到下限才加温 jiawen=0; /*主函数*/void main()uint z;InitTimer(); /初始化定时器EA=1; /全局中断开关TR0=1; /启动定时器0IT0=1; /定时器0脉冲触发方式,下降沿有效IT1=1; /定

10、时器1脉冲触发方式,下降沿有效check_wendu();check_wendu();for(z=0;z<300;z+)Disp_init();while(1)if(SET=0)Delay(600);/2000dowhile(SET=0);set_st+;x=0;shanshuo_st=1;if(set_st>2)set_st=0;if(set_st=0)EX0=0; /关闭外部中断0EX1=0; /关闭外部中断1check_wendu();Disp_Temperature();Alarm(); /加温检测else if(set_st=1)jiawen=1; /关闭加温EX0=1;

11、 /开启外部中断0EX1=1; /开启外部中断1if(x>=10)shanshuo_st=shanshuo_st;x=0;if(shanshuo_st) Disp_alarm(shangxian);else if(set_st=2)jiawen=1; /关闭加温EX0=1; /开启外部中断0EX1=1; /开启外部中断1if(x>=10)shanshuo_st=shanshuo_st;x=0;if(shanshuo_st) Disp_alarm(xiaxian); /*单片机89CS52*/#ifndef DS18B20_H#define DS18B20_H#include <

12、;AT89X52.h>#define uint unsigned int#define uchar unsigned char /宏定义sbit DQ=P37; /定义DS18B20 总线I/O/*延时子程序*/void Delay_DS18B20(int num)while(num-) ;/*初始化DS18B20*/void Init_DS18B20(void)uchar x=0;DQ = 1; /DQ 复位Delay_DS18B20(8); /稍做延时8DQ = 0; /单片机将DQ 拉低Delay_DS18B20(32); /精确延时，大于480us 80DQ = 1; /拉高总线

13、Delay_DS18B20(14); /14x = DQ; /稍做延时后，如果x=0 则初始化成功，x=1 则初始化失败Delay_DS18B20(20); /20/*读一个字节*/uchar ReadOneChar(void)uchar i=0;uchar dat = 0;for (i=8;i>0;i-)DQ = 0; / 给脉冲信号dat>>=1;DQ = 1; / 给脉冲信号if(DQ)dat|=0x80;Delay_DS18B20(4); /4return(dat);/*写一个字节*/void WriteOneChar(uchar dat)uchar i=0;for (i=8; i>0; i-)DQ = 0;DQ = dat&0x01;Delay_DS18B20(5); /5DQ = 1;dat>>=1;/*读取温度*/uint ReadTemperature(void)uchar a=0;uchar b=0;uint t=0;float tt=0;Init_DS18B20();WriteOneChar(0xCC); /跳过读序号列号的操作WriteOneChar(0x4