火灾报 警器DS18b20程序设计.docVIP

PAGE PAGE 7程序名称：DS18B20温度测量、报警系统简要说明：DS18B20温度计，温度测量范围0~99.9摄氏度?可设置上限报警温度、下限报警温度?即高于上限值或者低于下限值时蜂鸣器报警??默认上限报警温度为40℃、默认下限报警温度为0℃??报警值可设置范围：最低上限报警值等于当前下限报警值??最高下限报警值等于当前上限报警值??将下限报警值调为0时为关闭下限报警功能????#include AT89S51.h#include DS18B20.h???#define uint unsigned int#define uchar unsigned char? ?//宏定义#define SET? P3_1????//定义调整键#define DEC? P3_2????//定义减少键#define ADD? P3_3????//定义增加键#define BEEP P3_7????//定义蜂鸣器bit shanshuo_st;????//闪烁间隔标志bit beep_st;?????//蜂鸣器间隔标志sbit DIAN = P2^7;???? ???//小数点uchar x=0;??????//计数器signed char m;?????//温度值全局变量uchar n;??????//温度值全局变量uchar set_st=0;?????//状态标志signed char shangxian=38;??//上限报警温度，默认值为40signed char xiaxian=0;???//下限报警温度，默认值为0uchar code? LEDData[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0xff};/*****延时子程序*****/void Delay(uint num){?while( --num );}/*****初始化定时器0*****/void InitTimer(void){??TMOD=0x1;??TH0=0x3c;??TL0=0xb0;?????//50ms（晶振12M）}/*****定时器0中断服务程序*****/void timer0(void) interrupt 1{?TH0=0x3c;?TL0=0xb0;?x++;}/*****外部中断0服务程序*****/void int0(void) interrupt 0{??EX0=0;??????//关外部中断0?if(DEC==0set_st==1)?{??shangxian--;??if(shangxianxiaxian)shangxian=xiaxian;?}?else if(DEC==0set_st==2)?{??xiaxian--;??if(xiaxian0)xiaxian=0;?}}/*****外部中断1服务程序*****/void int1(void) interrupt 2{?EX1=0;??????//关外部中断1?if(ADD==0set_st==1)?{??shangxian++;??if(shangxian99)shangxian=99;?}?else if(ADD==0set_st==2)?{??xiaxian++;??if(xiaxianshangxian)xiaxian=shangxian;?}??}/*****读取温度*****/void check_wendu(void){?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(m0){m=0;n=0;}???//设置温度显示上限?if(m99){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()? ??{?P2 = 0xbf; ?????//显示-?P1 = 0xf7;?Delay(200);?P1 = 0xfb;?Delay(200); ???P1 = 0xfd;?Delay(200);?P1 = 0xfe;?Delay(200);?P1 = 0xff;????? ???//关闭显示}/*****显示温度子程序*****/Disp_Temperature()? ???/