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1、DS18B20温度传感器实验Proteus仿真原理图：DS18B20内部结构：-5-/*************************源程序****************************/-5-#include#include#defineuintunsignedint#defineucharunsignedchar#definedelayNOP(){_nop_();_nop_();_nop_();_nop_();}sbitDQ=P3^3;sbitLCD_RS=P2^0;sbitLCD_RW=P2^1;sbitLCD_EN=P2
2、^2;ucharcodeTemp_Disp_Title[]={"CurrentTemp:"};ucharCurrent_Temp_Display_Buffer[]={"TEMP:"};-5-ucharcodeTemperature_Char[8]={0x0c,0x12,0x12,0x0c,0x00,0x00,0x00,0x00};ucharcodedf_Table[]={0,1,1,2,3,3,4,4,5,6,6,7,8,8,9,9};ucharCurrentT=0;ucharTemp_Value[]={0x00,0x00};ucharDisplay_Digit[]={0,0,0
3、,0};bitDS18B20_IS_OK=1;voidDelayXus(uintx){uchari;while(x--){for(i=0;i<200;i++);}}bitLCD_Busy_Check(){bitresult;LCD_RS=0;LCD_RW=1;LCD_EN=1;delayNOP();result=(bit)(P0&0x80);LCD_EN=0;returnresult;}voidWrite_LCD_Command(ucharcmd){while(LCD_Busy_Check());LCD_RS=0;LCD_RW=0;LCD_EN=0;_nop_();_nop_()
4、;P0=cmd;delayNOP();LCD_EN=1;delayNOP();LCD_EN=0;}-5-voidWrite_LCD_Data(uchardat){while(LCD_Busy_Check());LCD_RS=1;LCD_RW=0;LCD_EN=0;P0=dat;delayNOP();LCD_EN=1;delayNOP();LCD_EN=0;}voidLCD_Initialise(){Write_LCD_Command(0x01);DelayXus(5);Write_LCD_Command(0x38);DelayXus(5);Write_LCD_Command(0x
5、0c);DelayXus(5);Write_LCD_Command(0x06);DelayXus(5);}voidSet_LCD_POS(ucharpos){Write_LCD_Command(pos
6、0x80);}voidDelay(uintx){while(--x);}ucharInit_DS18B20(){ucharstatus;DQ=1;Delay(8);DQ=0;Delay(90);DQ=1;Delay(8);DQ=1;returnstatus;}ucharReadOneByte(){uchari,dat=0;DQ=1;_nop_();for(i=0;i<8;i++){
7、DQ=0;dat>>=1;DQ=1;_nop_();_nop_();if(DQ)dat
8、=0X80;Delay(30);DQ=1;}returndat;}voidWriteOneByte(uchardat){uchari;for(i=0;i<8;i++){DQ=0;DQ=dat&0x01;Delay(5);DQ=1;dat>>=1;}}-5--5-voidRead_Temperature(){if(Init_DS18B20()==1)DS18B20_IS_OK=0;else{WriteOneByte(0xcc);WriteOneByte(0x44);Init_DS18B20();
9、WriteOneByte(0xcc);WriteOneByte(0xbe);Temp_Value[0]=ReadOneByte();Temp_Value[1]=ReadOneByte();DS18B20_IS_OK=1;}}voidDisplay_Temperature(){uchari;uchart=150,ng=0;if((Temp_Value[1]&0xf8)==0xf8){Temp_Value[1]=~Temp_Value[1];Temp_Value[0]=~Temp_V
