1、Good is good, but better carries it.精益求精，善益求善。DS18B20與51單片機多路溫度傳感器-51單片機C程序#include#include#defineucharunsignedcharsbitRS=P35;/定義LCD端口sbitRW=P36;sbitE=P37;sbitDQ=P34;/定義單總線端口ucharLCD_3,LCD_2,LCD_1,LCD_0;uchards18b20_romA8=0 x8e,0 x00,0 x00,0 x00,0 xb8,0 xc5,0 x30,0 x28;/四個DS18B20的64位ROM地址uchards18b2

2、0_romB8=0 x52,0 x00,0 x00,0 x00,0 xb8,0 xc5,0 x34,0 x28;uchards18b20_romC8=0 x65,0 x00,0 x00,0 x00,0 xb8,0 xc5,0 x35,0 x28;uchards18b20_romD8=0 x3c,0 x00,0 x00,0 x00,0 xb8,0 xc5,0 x36,0 x28;ucharcodeLCDData=0123456789;ucharcodedot_tab=0112334456678899;ucharfirst_line16=A:000.0B:000.0;/LCD第一行顯示緩存數(shù)組uc

3、harsecond_line16=C:000.0D:000.0;/LCD第二行顯示緩存數(shù)組/*/延時程序/*voiddelay(unsignedintN)unsignedinti;for(i=0;iN;i+);/*/LCD1602測忙/*voidcheck_busy(void)while(1)P1=0 xff;E=0;_nop_();RS=0;_nop_();_nop_();RW=1;_nop_();_nop_();E=1;_nop_();_nop_();_nop_();_nop_();if(P1&0 x80)=0)break;E=0;/*/LCD1602寫命令/*voidwrite_comm

4、and(uchartempdata)E=0;_nop_();_nop_();RS=0;_nop_();_nop_();RW=0;P1=tempdata;_nop_();_nop_();E=1;_nop_();_nop_();E=0;_nop_();check_busy();/*/LCD1602寫數(shù)據(jù)/*voidwrite_data(uchartempdata)E=0;_nop_();_nop_();RS=1;_nop_();_nop_();RW=0;P1=tempdata;_nop_();_nop_();E=1;_nop_();_nop_();E=0;_nop_();check_busy();

5、/*/初始化LCD1602/*voidinit_lcd1602()write_command(0 x01);/清除屏幕write_command(0 x38);/功能設定（8位，2行，5*7點陣式）write_command(0 x0c);/顯示器ON，光標OFF，閃爍OFFwrite_command(0 x06);/地址加1/*/初始化ds18b20/*bitresetpulse(void)DQ=0;delay(40);/延時500usDQ=1;delay(4);/延時60usreturn(DQ);/讀取P1.0的狀態(tài)voidds18b20_init(void)while(1)if(!res

6、etpulse()/收到ds18b20的應答信號DQ=1;delay(40);/延時240usbreak;elseresetpulse();/否則再發(fā)復位信號/*/讀ds18b20一位/*ucharread_bit(void)DQ=0;_nop_();_nop_();DQ=1;delay(2);return(DQ);/*/讀ds18b20一個字節(jié)/*ucharread_byte(void)uchari,m,receive_data;m=1;receive_data=0;for(i=0;i8;i+)if(read_bit()receive_data=receive_data+(mi);delay

7、(7);return(receive_data);/*/向ds18b20寫一位/*voidwrite_bit(ucharbitval)DQ=0;if(bitval=1)DQ=1;delay(5);DQ=1;/*/向DS18B20寫一個字節(jié)命令/*voidwrite_byte(ucharval)uchari,temp;for(i=0;ii;temp=temp&0 x01;write_bit(temp);delay(5);/*/64位的ROM序列號匹配/*bitmatch_rom(uchar*rom)uchari;ds18b20_init();write_byte(0 x55);for(i=8;i

8、0;i-)write_byte(*(rom+i-1);return1;/*/從ds18b20中讀出64位序列號/*/*uchar*read_rom(void)ucharrom8,i;ds18b20_init();write_byte(0 x33);for(i=8;i0;i-)romi-1=read_byte();return&rom0;*/*/將64位序列號顯示在LCD上顯示出來/*/*voidprint_char(uchara)if(a=0&a=0 x0a&a4)|(temp_data_h&0 x0f)4)|(temp_data_h&0 x0f)4);LCD_3=LCDDatatemp/10

9、0;/查表得溫度百位LCD_2=LCDData(temp%100)/10;/查表得溫度十位LCD_1=LCDData(temp%100)%10;/查表得溫度個位voiddisplay(void)uchari;write_command(0 x80);for(i=0;i16;i+)write_data(first_linei);write_command(0 xc0);for(i=0;i16;i+)write_data(second_linei);voidmain(void)uchartemp_data_l,temp_data_h;/*uchar*ds18b20_rom;*/init_lcd16

10、02();/*while(1)uchari;ds18b20_rom=read_rom();/讀序列號write_command(0 x80);for(i=0;i8;i+)ds18b20_romAi=*ds18b20_rom;ds18b20_rom+;write_command(0 x80);for(i=0;i8;i+)/顯示序列號print_char(ds18b20_romAi/16);print_char(ds18b20_romAi%16);*/while(1)ds18b20_init();write_byte(0 xcc);write_byte(0 x44);/啟動溫度轉換delay(70

11、0);match_rom(ds18b20_romA);/匹配第一路write_byte(0 xbe);/讀溫度temp_data_l=read_byte();/溫度低8位temp_data_h=read_byte();/溫度高8位convert_T(temp_data_h,temp_data_l);first_line2=LCD_3;/溫度轉換后的各位first_line3=LCD_2;/分別存入顯示緩存數(shù)組中first_line4=LCD_1;first_line6=LCD_0;match_rom(ds18b20_romB);/匹配第二路write_byte(0 xbe);/讀溫度temp_

12、data_l=read_byte();/溫度低8位temp_data_h=read_byte();/溫度高8位convert_T(temp_data_h,temp_data_l);first_line10=LCD_3;/溫度轉換后的各位first_line11=LCD_2;/分別存入顯示緩存數(shù)組中first_line12=LCD_1;first_line14=LCD_0;display();match_rom(ds18b20_romC);/匹配第三路write_byte(0 xbe);/讀溫度temp_data_l=read_byte();/溫度低8位temp_data_h=read_byte();/溫度高8位convert_T(temp_data_h,temp_data_l);second_line2=LCD_3;/溫度轉換后的各位second_line3=LCD_2;/分別存入顯示緩存數(shù)組中second_line4=LCD_1;second_line6=LCD_0;match_rom(ds18b20_romD);/匹配第四路write_byte(0 xbe);/讀溫度temp_da