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#include #define uchar unsigned char #define uint unsigned int sbit DS=P2^2; //define interface uint temp; // variable of temperature uint tempBaoJing; uchar flag1; // sign of the result positive or negative sbit dula=P2^6; sbit wela=P2^7; //sbit bee p=P3^7; unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d, 0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71}; unsigned char code table1[]={0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd, 0x87,0xff,0xef}; void delay(uint count) //delay { uint i; while(count) { i=200; while(i>0) i--; count--; } } void dsreset(void) //send reset and initialization command { uint i; DS=0; i=103; while(i>0)i--; DS=1; i=4; while(i>0)i--; } bit tmpreadbit(void) //read a bit { uint i; bit dat; DS=0;i++; //i++ for delay DS=1;i++;i++; dat=DS; i=8;while(i>0)i--; return (dat); } uchar tmpread(void) //read a byte date { uchar i,j,dat; dat=0; for(i=1;i<=8;i++) { j=tmpreadbit(); dat=(j<<7)|(dat>>1); //讀出的數據最低位在最前面，這樣剛好一個字節在DAT里 } return(dat); } void tmpwritebyte(uchar dat) //write a byte to ds18b20 { uint i; uchar j; bit testb; for(j=1;j<=8;j++) { testb=dat&0x01; dat=dat>>1; if(testb) //write 1 { DS=0; i++;i++; DS=1; i=8;while(i>0)i--; } else { DS=0; //write 0 i=8;while(i>0)i--; DS=1; i++;i++; } } } void tmpchange(void) //DS18B20 begin change { dsreset(); delay(1); tmpwritebyte(0xcc); // address all drivers on bus tmpwritebyte(0x44); // initiates a single temperature conversion } uint tmp() //get the temperature { float tt; uchar a,b; dsreset(); delay(1); tmpwritebyte(0xcc); tmpwritebyte(0xbe); a=tmpread(); b=tmpread(); temp=b; temp<<=8; //two byte compose a int variable temp=temp|a; tt=temp*0.0625; temp=tt*10+0.5; return temp; } void displayBaoJing(uint temp) //顯示程序 { uchar A1,A2,A2t; A1=temp/100; A2t=temp0; A2=A2t/10; dula=0; P0=table[A1]; //顯示百位 dula=1; dula=0; wela=0; P0=numPos[4]; wela=1; wela=0; delay(1); dula=0; P0=table1[A2]; //顯示十位 dula=1; dula=0; wela=0; P0=numPos[5]; wela=1; wela=0; delay(1); } void display(uint temp) //顯示程序 { uchar A1,A2,A2t,A3; A1=temp/100; A2t=temp0; A2=A2t/10; A3=A2t; dula=0; P0=table[A1]; //顯示百位 dula=1; dula=0; wela=0; P0=0x7e; wela=1; wela=0; delay(1); dula=0; P0=table1[A2]; //顯示十位 dula=1; dula=0; wela=0; P0=0x7d; wela=1; wela=0; delay(1); P0=table[A3]; //顯示個位 dula=1; dula=0; P0=0x7b; wela=1; wela=0; delay(1); } void InitTimer0(void) { TMOD = 0x01; TH0 = 0x0DC; TL0 = 0x00; EA = 1; ET0 = 1; TR0 = 0; } void main() { uchar a; InitTimer0(); tempBaoJing=250;//250為報警溫度乘以10之后得到的數值 do { tmpchange();//先調用tmpchange,此函數發送44H，啟動溫度轉換，然后再調用tmp()讀取溫度值 for(a=10;a>0;a--) { display(tmp()); displayBaoJing(tempBaoJing); } if (buttonS1==BUTTON_DOWN) { delayMsWYL(10); if (buttonS1==BUTTON_DOWN) { tempBaoJing=tempBaoJing+10; } } if (buttonS2==BUTTON_DOWN) { delayMsWYL(10); if (buttonS2==BUTTON_DOWN) { tempBaoJing=450; } } if (buttonS3==BUTTON_DOWN) { delayMsWYL(10); if (buttonS3==BUTTON_DOWN) { tempBaoJing=350; } } if(temp>=tempBaoJing) //當溫度超過31度（僅作試驗用，實際可設為其他更高的值），蜂鳴器便會報警。 { // P1=0xf1; // beep=BEEP_ON; TR0=1; } else { // beep=BEEP_OFF; // P1=0x00; TR0=0; } } while(1); } void Timer0(void) interrupt 1 { static int temp=0; TH0 = 0x0DC; TL0 = 0x00; //add your code here! temp++; if (temp>250&&temp<300) { //temp=0; beep=BEEP_ON; } else if (temp>300) { beep=BEEP_OFF; temp=0; } }
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