基于51单片机于DS18B20的应用.doc

功能：本实验可以正常利用DS18B20测量温度并显示，当温度高于所设温度上限时，蜂鸣器报警，高温灯亮；当温度低于所设温度下限时，继电器工作，D2给DS18B20加热。本实验利用DS18B20中的EEPROM，所以每次手动调节好的温度断电后可以保存，很方便，也是本实验的亮点。Protues下仿真通过，用Keil编写的程序正常显示温度:高温：低温：程序：（基于51单片机，keil编写，protues下运行）由于程序长，所以使用封装函数LCD1602.h。.H文件#ifndef _LCD1602_H_#define _LCD1602_H_#include#include#define uchar unsigned char#define uint unsigned int#define DATPORT P0sbit rs=P24;sbit rw=P25;sbit e =P26;void delay(uint xx);void write_com(uchar com);void write_dat(uchar dat);void lcd_init();void disp_assic(uchar *dat,uchar loc,uchar len); #endif.C文件#include LCD1602.hvoid delay(uint xx)while(xx-);void write_com(uchar com)e=0;rs=0;rw=0;delay(50);DATPORT=com;e=1;delay(50);e=0;delay(50);void write_dat(uchar dat)e=0;rs=1;rw=0;delay(50);DATPORT=dat;e=1;delay(50);e=0;delay(50);void lcd_init()write_com(0x38);delay(50);write_com(0x38); delay(50);write_com(0x38); delay(50);write_com(0x06); delay(50);write_com(0x0c);delay(50);write_com(0x01); delay(50);void disp_assic(uchar *dat,uchar loc,uchar len)uchar i;write_com(loc);for(i=0;ilen;i+)write_dat(dati);主函数#includeLCD1602.hsbit sck=P10;sbit sda=P11;sbit DQ=P34;sbit red=P20;sbit green=P21;sbit yellow=P22;sbit led_sheng=P36;sbit beep=P37;sbit kongzhi=P14;sbit shengwen=P15;sbit jiangwen=P16;uchar data result5;uint t1,t2;uchar tflag,i;uchar one,two,three,four;uchar aa2;uchar set_hightemp=33,set_lowtemp=15;uchar code str1=Temperature is: ;uchar code str2=;uchar code str3=set_hightemp: ;uchar code str4=set_lowtemp: ;void delay_1ms(uchar tt)uint i,j;for(i=0;itt;i+)for(j=0;j0;t-) DQ=0;value=1;DQ=1;if(DQ)value|=0x80; delay(10); return (value);void write_byte(uchar dat) /写一个字节 uchar t=0; for (t=8; t0; t-) DQ=0; DQ=dat&0x01; delay(10); DQ=1; dat=1; uchar start_test() /启动温度测试模块，并收集数据uchar a,b;ds18b20_init(); /复位总线 write_byte(0xCC); /忽略ROM匹配操作write_byte(0x44); /温度转换命令 delay(300); ds18b20_init();write_byte(0xCC); /忽略ROM匹配操作write_byte(0xBE); /读取RAM寄存器 a=read_byte(); /读取第一字节b=read_byte(); /读取第二字节t1=b;t1=8;t1=t1|a; if(t1 0; j-) beep = beep; delay_1ms(10); delay_1ms(10); void set_xianshi(uint ok) if(ok=1)disp_assic(str3,0x80,14);elsedisp_assic(str4,0x80,14);write_com(0x8d);write_dat(aa0);write_com(0x8e);write_dat(aa1);if(shengwen=0)delay_1ms(5);if(shengwen=0)if(ok=1)set_hightemp+;elseset_lowtemp+;while(!shengwen);if(jiangwen=0)delay_1ms(5);if(jiangwen=0)if(ok=1)set_hightemp-;elseset_lowtemp-;while(!jiangwen); void set_temp()uchar ok=0;if(kongzhi=0)delay_1ms(5);if(kongzhi=0)ok+;while(!kongzhi);while(ok=1)aa0=set_hightemp/10+0x30;aa1=set_hightemp%10+0x30;set_xianshi(1);if(kongzhi=0)delay_1ms(5);if(kongzhi=0)ok+;while(!kongzhi);delay_1ms(5);while(ok=2)aa0=set_lowtemp/10+0x30;aa1=set_lowtemp%10+0x30;set_xianshi(2);if(kongzhi=0)delay_1ms(5);if(kongzhi=0)ok=0;while(!kongzhi);delay_1ms(5);disp_assic(str1,0x80,16);void set_led()if(t1/10=set_hightemp)red=0;green=1;yellow=1;delay_1ms(10);baojing();else if(t1/10set_lowtemp) red=1;green=1;yellow=0;delay_1ms(10);else if(set_lowtemp=(t1/10)&(t1/10)set_hightemp)red=1;green=0;yellow=1;delay_1ms(10);void led_shengwen() led_sheng=0;if(t1/10set_lowtemp) for(i=0;i10;i+) led_sheng=1; delay_1ms(100); void save_temp() /保存温度上下线到EEPROMds18b20_init();write_byte(0xCC); /忽略ROM匹配操作write_byte(0x4E); /写暂存存储器命令（RAM）write_byte(set_hightemp); /写第三字节write_byte(set_lowtemp); /写第四字节ds18b20_init();write_byte(0xCC); /忽略ROM匹配操作write_byte(0x48); /复制暂存存储器delay(300);uchar call_temp1()ds18b20_init();write_byte(0xCC); /忽略ROM匹配操作write_byte(0x44); /温度转换命令write_byte(0xB8); /重新调出EEPROM的值 delay(300); ds18b20_init();write_byte(0xCC); /忽略ROM匹配操作write_byte(0xbe); /读取RAM寄存器one=read_byte(); /读取第一字节two=read_byte(); /读取第二字节three=read_byte(); /读取第三字节four=read_byte(); /读取第四字节return(three);uchar call_temp2()ds18b20_init();write_byte(0xCC); /忽略ROM匹配操作write_byte(0x44); /温度转换命令write_byte(0xB8); /重新调出EEPROM的值 delay(300); ds18b20_init();write_byte(0xCC); /忽略ROM匹配操作write_byte(0xbe); /读取RAM寄存器one=read_byte(); /读取第一字节two=read_byte(); /读取第二字节three=read_byte(); /读取第三字节four=read_byte(); /读取第四字节return(four);void main() uchar xx;lcd_i