DS1820 構(gòu)成測溫系統(tǒng)

實驗任務用一片 DS18B20 構(gòu)成測溫系統(tǒng)，測量的溫度精度達到 0.1 度，測量的溫度的范圍在20度到50度之間，用4位數(shù)碼管顯示出來。硬件電路圖實驗原理DS18B20 數(shù)字溫度計是 DALLAS 公司生產(chǎn)的 1Wire，即單總線器件，具有線路簡單，體積小的特點。因此用它來組成一個測溫系統(tǒng)，具有線路簡單，在一根通信線，可以掛很多這樣的數(shù)字溫度計。DS18B20 產(chǎn)品的特點（1）、只要求一個I/O口即可實現(xiàn)通信。（2）、在DS18B20中的每個器件上都有獨一無二的序列號。（3）、實際應用中不需要外部任何元器件即可實現(xiàn)測溫。（4）、測量溫度范圍在55。C到125。C之間。（5）、數(shù)字溫度計的分辨率用戶可以從9位到12位選擇。（6）、內(nèi)部有溫度上、下限告警設置。DS18B20詳細引腳功能描述1 GND地信號；2 DQ數(shù)據(jù)輸入/輸出引腳。開漏單總線接口引腳。當被用著在寄生電源下，也可以向器件提供電源；3 VDD可選擇的VDD引腳。當工作于寄生電源時，此引腳必須接地。DS18B20的使用方法。由于DS18B20采用的是1Wire總線協(xié)議方式，即在一根數(shù)據(jù)線實現(xiàn)數(shù)據(jù)的雙向傳輸，而對AT89S51單片機來說，我們必須采用軟件的方法來模擬單總線的協(xié)議時序來完成對DS18B20芯片的訪問。由于DS18B20是在一根I/O線上讀寫數(shù)據(jù)，因此，對讀寫的數(shù)據(jù)位有著嚴格的時序要求。DS18B20有嚴格的通信協(xié)議來保證各位數(shù)據(jù)傳輸?shù)恼_性和完整性。該協(xié)議定義了幾種信號的時序：初始化時序、讀時序、寫時序。所有時序都是將主機作為主設備，單總線器件作為從設備。而每一次命令和數(shù)據(jù)的傳輸都是從主機主動啟動寫時序開始，如果要求單總線器件回送數(shù)據(jù)，在進行寫命令后，主機需啟動讀時序完成數(shù)據(jù)接收。數(shù)據(jù)和命令的傳輸都是低位在先。C語言源程序 程序一#includecode unsigned char seg7code11= 0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90; /顯示段碼sbit TMDAT =P31; /DS18B20 的數(shù)據(jù)輸入/輸出腳DQ,根據(jù)情況設定unsigned int sdata;/測量到的溫度的整數(shù)部分unsigned char xiaoshu1;/小數(shù)第一位unsigned char xiaoshu2;/小數(shù)第二位unsigned char xiaoshu;/兩位小數(shù)bit fg=1; /溫度正負標志/*顯示延時程序*/void Delay(unsigned int tc)while( tc != 0 )unsigned int i;for(i=0; i80; i+);tc-;/延時部分/void dmsec (unsigned int count) unsigned char i;while(count-)for(i=0;i115;i+);/發(fā)送復位/void tmreset (void) unsigned char i;TMDAT=0; for(i=0;i103;i+);TMDAT = 1; for(i=0;i4;i+);bit tmrbit (void) /讀一位/ unsigned int i;bit dat;TMDAT = 0;i+;TMDAT = 1;i+; i+; /微量延時 /dat = TMDAT;for(i=0;i8;i+);return (dat);unsigned char tmrbyte (void) /讀一個字節(jié)unsigned char i,j,dat;dat = 0;for (i=1;i=8;i+) j = tmrbit(); dat = (j 1); return (dat);void tmwbyte (unsigned char dat) /寫一個字節(jié)unsigned char j,i;bit testb;for (j=1;j 1;if (testb) TMDAT = 0; /寫0i+; i+;TMDAT = 1;for(i=0;i8;i+); else TMDAT = 0; /寫0for(i=0;i0x7f) /最高位為1 時溫度是負a=a; b=b+1; /補碼轉(zhuǎn)換，取反加一fg=0; /讀取溫度為負時fg=0sdata = a/16+b*16; /整數(shù)部分xiaoshu1 = (a&0x0f)*10/16; /小數(shù)第一位xiaoshu2 = (a&0x0f)*100/16%10;/小數(shù)xiaoshu=xiaoshu1*10+xiaoshu2; /小數(shù)void DS18B20PRO(void) tmstart();/dmsec(5); /如果是不斷地讀取的話可以不延tmrtemp(); /讀取溫度,執(zhí)行完畢溫度將存于void Led()if(fg=1) /溫度為正時顯示的數(shù)據(jù) P2=P2&0xef;P0=seg7codesdata/10; /輸Delay(8); P2=P2|0xf0; P2=P2&0xdf;P0=seg7codesdata%10|0x80; /輸出個Delay(8); P2=P2|0xf0; P2=P2&0xbf;P0=seg7codexiaoshu1; /輸出小數(shù)點Delay(8); P2=P2|0xf0; P2=P2&0x7f;P0=seg7codexiaoshu2; /輸出小Delay(4); P2=P2|0xf0;if(fg=0) /溫度為負時顯示的數(shù)據(jù) P2=P2&0xef;P0=seg7code11; /負號Delay(8); P2=P2|0xf0; P2=P2&0xdf;P0=seg7codesdata/10|0x80; /輸出十位Delay(8); P2=P2|0xf0; P2=P2&0xbf;P0=seg7codesdata%10; /輸出個位Delay(8); P2=P2|0xf0; P2=P2&0x7f;P0=seg7codexiaoshu1; /輸出小Delay(4); P2=P2|0xf0;main()fg=1;while(1)DS18B20PRO();Led();C語言源程序 程序二#includecode unsigned char seg7code11= 0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x40; /顯示段碼sbit TMDAT =P31; /DS18B20 的數(shù)據(jù)輸入/輸出腳DQ,根據(jù)情況設定unsigned int sdata;/測量到的溫度的整數(shù)部分unsigned char xiaoshu1;/小數(shù)第一位unsigned char xiaoshu2;/小數(shù)第二位unsigned char xiaoshu;/兩位小數(shù)bit fg=1; /溫度正負標志/*顯示延時程序*/void Delay(unsigned int tc)while( tc != 0 )unsigned int i;for(i=0; i80; i+);tc-;/延時部分/void yanshi (unsigned int count) unsigned char i;while(count-)for(i=0;i115;i+);/發(fā)送復位/void fashong (void) unsigned char i;TMDAT = 0; for(i=0;i103;i+);TMDAT = 1; for(i=0;i4;i+);bit tmrbit (void) /讀一位/ unsigned int i;bit dat;TMDAT = 0;i+;TMDAT = 1;i+; i+; /微量延時 /dat = TMDAT;for(i=0;i8;i+);return (dat);unsigned char tmrbyte (void) /讀一個字節(jié)unsigned char i,j,dat;dat = 0;for (i=1;i=8;i+) j = tmrbit(); dat = (j 1); return (dat);void tmwbyte (unsigned char dat) /寫一個字節(jié)unsigned char j,i;bit testb;for (j=1;j 1;if (testb) TMDAT = 0; /寫0i+; i+;TMDAT = 1;for(i=0;i8;i+); else TMDAT = 0; /寫0for(i=0;i0x7f) /最高位為1 時溫度是負a=a; b=b+1; /補碼轉(zhuǎn)換，取反加一fg=0; /讀取溫度為負時fg=0sdata = a/16+b*16; /整數(shù)部分xiaoshu1 = (a&0x0f)*10/16; /小數(shù)第一位xiaoshu2 = (a&0x0f)*100/16%10;/小數(shù)xiaoshu=xiaoshu1*10+xiaoshu2; /小數(shù)void DS18B20PRO(void) tmstart();/yanshi(5); /如果是不斷地讀取的話可以不延tmrtemp(); /讀取溫度,執(zhí)行完畢溫度將存于void Led()if(fg=1) /溫度為正時顯示的數(shù)據(jù) P2=P2&0xef;P0=seg7codesdata/10; /輸出十位Delay(8); P2=P2|0xf0; P2=P2&0xdf;P0=seg7codesdata%10|0x80; /輸出個位Delay(8); P2=P2|0xf0; P2=P2&0xbf;P0=seg7codexiaoshu1; /輸出小數(shù)點Delay(8); P2=P2|0xf0; P2=P2&0x7f;P0=seg7codexiaoshu2; /輸出小Delay(4); P2=P2|0xf0;if(sdata=33)P1=0xaa;if(sdata=35)P1=0x0f;/P1=0x0f;if(fg=0) /溫度為負時顯示的數(shù)據(jù) P2=P2&0xef;P0=seg7code11; /負號Delay(8); P2=P2|0xf0; P2=P2&0xdf;P0=seg7codesdata/10|0x80; /輸出十位Delay(8); P2=P2|0xf0; P2=P2&0xbf;P0=seg7codesdata%10; /輸出個位Delay(8); P2=P2|0xf0; P2=P2&0x7f;P0=seg7codexiaoshu1; /輸出小Delay(4); P2=P2|0xf0;main()fg=1;while(1)DS18B20PRO();Led();C語言源程序 程序三#includecode unsigned char seg7code11= 0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x40; /顯示段碼sbit TMDAT =P31; /DS18B20 的數(shù)據(jù)輸入/輸出腳DQ,根據(jù)情況設定sbit jia=P21;sbit jian=P22;j=10;unsigned int sdata;/測量到的溫度的整數(shù)部分unsigned char xiaoshu1;/小數(shù)第一位unsigned char xiaoshu2;/小數(shù)第二位unsigned char xiaoshu;/兩位小數(shù)bit fg=1; /溫度正負標志/*顯示延時程序*/void Delay(unsigned int tc)while( tc != 0 )unsigned int i;for(i=0; i80; i+);tc-;/延時部分/void yanshi (unsigned int count) unsigned char i;while(count-)for(i=0;i115;i+);/發(fā)送復位/void fashong (void) unsigned char i;TMDAT = 0; for(i=0;i103;i+);TMDAT = 1; for(i=0;i4;i+);bit tmrbit (void) /讀一位/ unsigned int i;bit dat;TMDAT = 0;i+;TMDAT = 1;i+; i+; /微量延時 /dat = TMDAT;for(i=0;i8;i+);return (dat);unsigned char tmrbyte (void) /讀一個字節(jié)unsigned char i,j,dat;dat = 0;for (i=1;i=8;i+) j = tmrbit(); dat = (j 1); return (dat);void tmwbyte (unsigned char dat) /寫一個字節(jié)unsigned char j,i;bit testb;for (j=1;j 1;if (testb) TMDAT = 0; /寫0i+; i+;TMDAT = 1;for(i=0;i8;i+); else TMDAT = 0; /寫0for(i=0;i0x7f) /最高位為1 時溫度是負a=a; b=b+1; /補碼轉(zhuǎn)換，取反加一fg=0; /讀取溫度為負時fg=0sdata = a/16+b*16; /整數(shù)部分xiaoshu1 = (a&0x0f)*10/16; /小數(shù)第一位xiaoshu2 = (a&0x0f)*100/16%10;/小數(shù)xiaoshu=xiaoshu1*10+xiaoshu2; /小數(shù)void DS18B20PRO(void) tmstart();/yanshi(5); /如果是不斷地讀取的話可以不延tmrtemp(); /讀取溫度,執(zhí)行完畢溫度將存于void Led()if(fg=1) /溫度為正時顯示的數(shù)據(jù) P2=P2&0xef;P0=seg7codesdata/10; /輸出十位Delay(8); P2=P2|0xf0; P2=P2&0xdf;P0=seg7codesdata%10|0x80; /輸出個位/按鍵設定值/Delay(8); P2=P2|0xf0;P2=P2&0xbf;P0=seg7codej/10; /輸出十位Delay(8); P2=P2|0xf0; P2=P2&0x7f;P0=seg7codej%10|0x80; /輸出個位 Delay(4); P2=P2|0xf0;/*Delay(8); P2=P2|0xf0; P2=P2&0xbf;P0=seg7codexiaoshu1; /輸出小數(shù)點Delay(8); P2=P2|0xf0; P2=P2&0x7f;P0=seg7codexiaoshu2; /輸出小Delay(4); P2=P2|0xf0;*/if(sdata=j)/上限P1=0xaa;if(sdata=35)P1=0x0f;/P1=0x0f;if(fg=0) /溫度為負時顯示的數(shù)據(jù) P2=P2&0xef;P0=seg7code11; /負號Delay(8); P2=P2|0xf0; P2=P2&0xdf;P0=seg7codesdata/10|0x80; /輸出十位Delay(8); P2=P2|0xf0; P2=P2&0xbf;P0=seg7codesdata%10; /輸出個位Delay(8); P2=P2|0xf0; P2=P2&0x7f;P0=seg7codexiaoshu1; /輸出小Delay(4); P2=P2|0xf0;main()fg=1;while(1)DS18B20PRO();Led();if(jia=0)j+;if(jian=0)j-;C語言源程序 程序四#includecode unsigned char seg7code11= 0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x40; /顯示段碼sbit TMDAT =P31; /DS18B20 的數(shù)據(jù)輸入/輸出腳DQ,根據(jù)情況設定sbit jia=P21;sbit jian=P22;j=10;unsigned int sdata;/測量到的溫度的整數(shù)部分unsigned char xiaoshu1;/小數(shù)第一位unsigned char xiaoshu2;/小數(shù)第二位unsigned char xiaoshu;/兩位小數(shù)bit fg=1; /溫度正負標志/*顯示延時程序*/void Delay(unsigned int tc)while( tc != 0 )unsigned int i;for(i=0; i80; i+);tc-;/延時部分/void yanshi (unsigned int count) unsigned char i;while(count-)for(i=0;i115;i+);/發(fā)送復位/void fashong (void) unsigned char i;TMDAT = 0; for(i=0;i103;i+);TMDAT = 1; for(i=0;i4;i+);bit tmrbit (void) /讀一位/ unsigned int i;bit dat;TMDAT = 0;i+;TMDAT = 1;i+; i+; /微量延時 /dat = TMDAT;for(i=0;i8;i+);return (dat);unsigned char tmrbyte (void) /讀一個字節(jié)unsigned char i,j,dat;dat = 0;for (i=1;i=8;i+) j = tmrbit(); dat = (j 1); return (dat);void tmwbyte (unsigned char dat) /寫一個字節(jié)unsigned char j,i;bit testb;for (j=1;j 1;if (testb) TMDAT = 0; /寫0i+; i+;TMDAT = 1;for(i=0;i8;i+); else TMDAT = 0; /寫0for(i=0;i0x7f) /最高位為1 時溫度是負a=a; b=b+1; /補碼轉(zhuǎn)換，取反加一fg=0; /讀取溫度為負時fg=0sdata = a/16+b*16; /整數(shù)部分xiaoshu1 = (a&0x0f)*10/16; /小數(shù)第一位xiaoshu2 = (a&0x0f)*100/16%10;/小數(shù)xiaoshu=xiaoshu1*10+xiaoshu2; /小數(shù)void DS18B20PRO(void) tmstart();/yanshi(5); /如果是不斷地讀取的話可以不延tmrtemp(); /讀取溫度,執(zhí)行完畢溫度將存于void Led()if(fg=1) /溫度為正時顯示的數(shù)據(jù) P2=P2&0xef;P0=seg7codesdata/10; /輸出十位Delay(8); P2=P2|0xf0; P2=P2&0xdf;P0=seg7codesdata%10|0x80; /輸出個位Delay(8); P2=P2|0xf0;P2=P2&0xbf;P0=seg7codej/10; /輸出十位Delay(8); P2=P2|0xf0; P2=P2&0x7f;P0=seg7codej%10|0x80; /輸出個位 Delay(4); P2=P2|0xf0;/*Delay(8); P2=P2|0xf0; P2=P2&0xbf;P0=seg7codexiaoshu1; /輸出小數(shù)點Delay(8); P2=P2|0xf0; P2=P2&0x7f;P0=seg7codexiaoshu2; /輸出小Delay(4); P2=P2|0xf0;*/if(sdata=j)P1=0xaa;if(sdata=35)P1=0x0f;/P1=0x0f;if(fg=0) /溫度為負時顯示的數(shù)據(jù) P2=P2&0xef;P0=seg7code11; /負號Delay(8); P2=P2|0xf0; P2=P2&0xdf;P0=seg7codesdata/10|0x80; /輸出十位Delay(8); P2=P2|0xf0; P2=P2&0xbf;P0=seg7codesdata%10; /輸出個位Delay(8); P2=P2|0xf0; P2=P2&0x7f;P0=seg7codexiaoshu1; /輸出小Delay(4); P2=P2|0xf0;main()fg=1;while(1)DS18B20PRO();Led();if(jia=0)Delay(200);j+;if(jian=0)Delay(200);j-;C語言源程序 程序五#includecode unsigned char seg7code11= 0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x40; /顯示段碼sbit TMDAT =P31; /DS18B20 的數(shù)據(jù)輸入/輸出腳DQ,根據(jù)情況設定sbit jia=P20;sbit jian=P21;j=35;unsigned int sdata;/測量到的溫度的整數(shù)部分unsigned char xiaoshu1;/小數(shù)第一位unsigned char xiaoshu2;/小數(shù)第二位unsigned char xiaoshu;/兩位小數(shù)bit fg=1; /溫度正負標志/*顯示延時程序*/void Delay(unsigned int tc)while( tc != 0 )unsigned int i;for(i=0; i80; i+);tc-;/延時部分/void yanshi (unsigned int count) unsigned char i;while(count-)for(i=0;i115;i+);/發(fā)送復位/void fashong (void) unsigned char i;TMDAT = 0; for(i=0;i103;i+);TMDAT = 1; for(i=0;i4;i+);bit tmrbit (void) /讀一位/ unsigned int i;bit dat;TMDAT = 0;i+;TMDAT = 1;i+; i+; /微量延時 /dat = TMDAT;for(i=0;i8;i+);return (dat);unsigned char tmrbyte (void) /讀一個字節(jié)unsigned char i,j,dat;dat = 0;for (i=1;i=8;i+) j = tmrbit(); dat = (j 1); return (dat);void tmwbyte (unsigned char dat) /寫一個字節(jié)unsigned char j,i;bit testb;for (j=1;j 1;if (testb) TMDAT = 0; /寫0i+; i+;TMDAT = 1;for(i=0;i8;i+); else TMDAT = 0; /寫0for(i=0;i0x7f) /最高位為1 時溫度是負a=a; b=b+1; /補碼轉(zhuǎn)換，取反加一fg=0; /讀取溫度為負時fg=0sdata = a/16+b*16; /整數(shù)部分xiaoshu1 = (a&0x0f)*10/16; /小數(shù)第一位xiaoshu2 = (a&0x0f)*100/16%10;/小數(shù)xiaoshu=xiaoshu1*10+xiaoshu2; /小數(shù)void DS18B20PRO(void) tmstart();/yanshi(5); /如果是不斷地讀取的話可以不延tmrtemp(); /讀取溫度,執(zhí)行完畢溫度將存于void Led()if(fg=1) /溫度為正時顯示的數(shù)據(jù) P2=P2&0x7f;P0=seg7codesdata/10; /輸出十位Delay(8); P2=P2|0xf0;P2=P2&0xbf;P0=seg7codesdata%10|0x80; /輸出個位Delay(8); P2=P2|0xf0;P2=P2&0xdf;P0=seg7codej/10; /輸出十位Delay(8); P2=P2|0xf0; P2=P2&0xef;P0=seg7codej%10|0x80; /輸出個位 Delay(4); P2=P2|0xf0;if(sdata=j)P1=0xaa;if(fg=0) /溫度為負時顯示的數(shù)據(jù) P2=P2&0xef;P0=seg7code11; /負號Delay(8); P2=P2|0xf0; P2=P2&0xdf;P0=seg7codesdata/10|0x80; /輸出十位Delay(8); P2=P2|0xf0; P2=P2&0xbf;P0=seg7codesdata%10; /輸出個位Delay(8); P2=P2|0xf0; P2=P2&0x7f;P0=seg7codexiaoshu1; /輸出小Delay(4); P2=P2|0xf0;main()fg=1;while(1)DS18B20PRO();Led();if(jia=0)Delay(200);j+;if(jian=0)Delay(200);j-;畢業(yè)設計最終程序#includecode unsigned char seg7code11= 0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x40; /顯示段碼sbit TMDAT =P31; /DS18B20 的數(shù)據(jù)輸入/輸出腳DQ,根據(jù)情況設定sbit jia=P21;sbit jian=P20;sbit hong=P10;/紅色警告燈sbit sheng=P11;/蜂鳴器sbit lan=P12;/蘭色燈j=35;unsigned int sdata;/測量到的溫度的整數(shù)部分unsigned char xiaoshu1;/小數(shù)第一位unsigned char xiaoshu2;/小數(shù)第二位unsigned char xiaoshu;/兩位小數(shù)bit fg=1; /溫度正負標志/*顯示延時程序*/void Delay(unsigned int tc)while( tc != 0 )unsigned int i;for(i=0; i80; i+);tc-;/延時部分/void yanshi (unsigned int count) unsigned char i;while(count-)for(i=0;i115;i+);/發(fā)送復位/void fashong (void) unsigned char i;TMDAT = 0; for(i=0;i103;i+);TMDAT = 1; for(i=0;i4;i+);bit tmrbit (void) /讀一位/ unsigned int i;bit dat;TMDAT = 0;i+;TMDAT = 1;i+; i+; /微