DS18b20溫度傳感器

1、最小的溫度顯示程序 -c51(2010-12-07 00:45:27)轉(zhuǎn)載標(biāo)簽：分類：51單片機(jī)雜談#in clude<reg52.h>#in clude<math.h>sbit DQ=P2A0;bitprese nee;un sig ned char templ,temph;char array10=0x7e,0x48,0x3d,0x6d,0x4b,0x67,0x73,0x4c,0x7f,0x4f;void Delay (un sig ned int num)/可定義延時(shí)while( -num );bit In it_DS18B20(void)DQ = 1;/DQ 復(fù)

2、位Delay(8);/稍做延時(shí)DQ = 0;/單片機(jī)將DC拉低Delay(90);/精確延時(shí)大于480usDQ = 1;/拉高總線Delay(8);presenee = DQ;/如果=0則初始化成功=1則初始化失敗Delay(100);DQ = 1;return(prese nee); /返回信號(hào)，0=prese nce,1= no prese nee un sig ned int Read On eChar(void) un sig ned char i = 0;un sig ned char dat = 0;for (i = 8; i > 0; i-)DQ = 0; / 給脈沖信號(hào)d

3、at >>= 1; / 位右移DQ = 1; / 給脈沖信號(hào) 等待傳感器返回脈沖if(DQ)dat |= 0x80;Delay(4);return (dat);void WriteOneChar(unsigned char dat) unsigned char i = 0;for (i = 8; i > 0; i-)DQ = 0;DQ = dat&0x01;Delay(5);DQ = 1; dat>>=1;void Read_Temperature(void) Init_DS18B20();WriteOneChar(0xcc);WriteOneChar(0

4、x44);/ 跳過讀序號(hào)列號(hào)的操作/ 啟動(dòng)溫度轉(zhuǎn)換Init_DS18B20();WriteOneChar(0xCC);WriteOneChar(0xBE);/ 跳過讀序號(hào)列號(hào)的操作/ 讀取溫度寄存器templ = ReadOneChar(); / 溫度低 8 位temph = ReadOneChar();/ 溫度高 8 位void main() float temp; char a;Init_DS18B20();WriteOneChar(0xcc);WriteOneChar(0x44); / 啟動(dòng)溫度轉(zhuǎn)換 Init_DS18B20();WriteOneChar(0xcc);/ 溫度高 8 位W

5、riteOneChar(0xbe); / 讀取溫度寄存器 templ = ReadOneChar();/ 溫度低 8 位temph = ReadOneChar();temph&=0x07;temp=(templ>>4)|(temph<<4);temp+=(templ&0x0f)*0.0625;a= temp/10;P1=arraya;a=temp-10*a;P0=arraya;/*DS18b20 溫度傳感器p3.4 作為數(shù)據(jù)傳輸口晶振： 11.0592M*/#include<reg51.H> sbit DQ= P3八4;int tempera

6、ture ;void delay(int us) int s;for ( s=0; s<us; s+);void rst(void)DQ = 1;delay(2);DQ = 0;delay(30); / 精確延時(shí) 480960usDQ = 1;delay(8);unsigned int read(void)int i=0;unsigned int u=0;for (i=0;i<16;i+)DQ=0;u>>=1;DQ=1;if(DQ) u|=0x8000;delay(4);return (u);void write(unsigned char ku)int i=0;for (i=0;i<8;i+)DQ=0;DQ =ku&0x01;delay(3);DQ=1;ku>>=1;void read0(void)/int temperature ; unsigned int tp; unsigned int lsb;rst(); write(0xCC);write(0x44);rst();write(0xCC);write(0xBE); tp=read();lsb=(unsigned int)(tp*6.25); / tem