單片機控制的溫度傳感器C語言程序

1、#include <at89x52.h>#define DO P3_7 #define SEG P0 /數碼管自左至右依次為1234位#define MS2L 0x18 /1ms的延時參數#define MS2H 0xfc#define uchar unsigned char#define uint unsigned intuchar code comm4 = 0x01,0x02,0x04,0x08;uchar code seg10 = 0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90;uchar code seg_add_dici

2、mal10 = 0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10; uchar code seg_dicimal2 =0xc0, 0x92;uchar k = 0;uchar temp_l = 0;uchar temp_h = 0;uchar tempsign = 0;uchar hundreds = 0;uchar tens = 0;uchar ones = 0;uchar low_four = 0;/*延時以ms為單位的t時間*/void Delay(uint t) uint i; while(t-) for(i=0; i<125;

3、i+) /*us級延時,延時時間約42*i*/void Delayus(uchar i) while(-i); /*產生復位脈沖,等待應答信號*/void Resetpaulse() DO = 0; /拉低約600us Delayus(150); Delayus(150); DO = 1;/產生上升沿,延時約1560us Delayus(30); while(DO); /等待應答信號 /*讀取數據一位*/bit Readbit() uint i = 0; bit b = 0; DO = 0; /產生讀時隙 i+; /維持低電平至少1us DO = 1; /1us以上后拉高 Delayus(2)

4、; /延時8us，DO下降沿15內ds18b20輸出的數據才有效 b = DO; /讀取數據 Delayus(40); /每個讀時隙至少持續(xù)60us return(b); /*讀取一個字節(jié)*/uchar Readbyte() uchar byte_read = 0; uchar i, j; for(i=0; i<8; i+) j = Readbit(); byte_read = (j<<i) | byte_read; /低位讀起 return(byte_read); /*寫一個字節(jié)*/void Writebyte(uchar byte_to_write) uchar i =

5、0; uchar j = 0; bit write_bit = 0; for(j=0; j<8; j+) write_bit = (byte_to_write & 0x01); if(write_bit = 1) /寫1 DO = 0; /產生寫時隙 Delayus(3); /延時15us DO = 1; /寫1 Delayus(40); /延時，寫時隙不得低于60us else DO = 0; /產生寫時隙 Delayus(50); /延時，保持低約60us120us DO = 1; i+; byte_to_write = byte_to_write >> 1; /

6、*配置ds18b20，9位分辨率 */void Configurate() EA = 0; Resetpaulse(); /發(fā)出復位脈沖，每次操作都從復位開始 Delay(1); Writebyte(0xcc); /skip room命令 Writebyte(0x4e); Writebyte(0x7f); Writebyte(0x80); Writebyte(0x1f); EA = 1;/*啟動溫度轉換*/void StartConvert() Resetpaulse(); / 發(fā)出復位脈沖，每次操作都從復位開始 Delay(1); EA = 0; Writebyte(0xcc); /skip

7、 room命令 Writebyte(0x44); /啟動溫度轉換命令 EA = 1;/*讀取溫度值*/void ReadTempreture() EA = 0; Resetpaulse(); / 發(fā)出復位脈沖，每次操作都從復位開始 Delay(1); Writebyte(0xcc); /skip room命令 Writebyte(0xbe); /讀取暫存器命令 temp_l = Readbyte(); /存儲溫度低字節(jié)值 （整數部分低四位和小數部分） temp_h= Readbyte(); /存儲溫度高字節(jié)值 （其中高五位為符號位） EA = 1;/*數據轉換*/void DigitalCon

8、vert() uchar total = 0; tempsign = (temp_h >> 7) & 0x01; /得出符號位 if(tempsign = 0) /正數的處理方法 total = (temp_h << 4)&0xf0) | (temp_l >> 4)&0x0f); /取整數位 low_four = (temp_l>>3) & 0x01; /取小數位，9位分辨率，低字節(jié)第3位為小數位，只有0、1兩種取值 hundreds = total / 100; /計算百、十、個位 tens = (total%1

9、00)/10; ones = (total%100)%10; else /負數處理 求負數補碼規(guī)則是，按位取反，得到反碼，加1即得補碼（符號位不變） tempsign = 1; total = (temp_l >> 4) & 0x0f); /取整數部分低4位 total |= (temp_h << 4) & 0xf0); /整數部分高三位和符號位 low_four = (temp_l >> 3) & 0x01; /取小數位 if(low_four = 0) /這里total位uchar型變量，所以根據最低位來確定整數取補規(guī)則 tota

10、l = total + 1; /最低位為0的時候，取反加1后有進位，所以這里total要取反加1 else total = total;/最低位為1的時候，取反加1沒有進位，所以total直接取反即可 tens = (total%100)/10; ones = (total%100)%10; /*中斷處理*/void Display()interrupt 1 EA = 0; TL0 = MS2L; TH0 = MS2H; DigitalConvert(); /數據轉換 if(tempsign = 0)/正數 if(k = 0) if(hundreds = 0) /高位0消隱 P1 = 0; e

11、lse P1 = commk; SEG = seghundreds; else if(k = 1) if(tens = 0 && hundreds = 0) /高位0消隱 P1 = 0; else P1 = commk; SEG = segtens; else if(k = 2)/顯示個位，因為個位有小數點，所以又定義了一個數組分開來顯示 P1 = commk; SEG = seg_add_dicimalones; /要加上小數點else /顯示小數，0或5 P1 = commk; SEG = seg_dicimallow_four; else if(tempsign = 1) /負數 if(k = 0)/顯示符號位 P1 = commk; SEG = 0xbf; else if(k = 1) if(tens = 0) P1 = 0; else P1 = commk; SEG = segtens; else if(k = 2)/顯示個位，因為各位有小數點，所以分開來顯示 P1 = commk; SEG = seg_add_dicimalones; /要加上小數點 else /顯示小數，0或5 P1 = commk; SEG = seg_dicimallow_four; k+; if(k = 4) k = 0