- 源程序：
- #include<reg51.h>
- #include<intrins.h>
- typedef unsigned char u8;
- typedef unsigned int u16;
- #define LCD1602_DATAPINS P0
- #ifndef uchar
- #define uchar unsigned char
- #endif
- #ifndef uint8
- #define uint8 unsigned int
- #endif
- sbit beep=P1^5;
- sbit DSPORT=P3^7;
- sbit LCD1602_E=P2^7;
- sbit LCD1602_RW=P2^5;
- sbit LCD1602_RS=P2^6;
- sbit k1=P3^1; //模式
- sbit k2=P3^0; //加
- sbit k3=P3^2; //減
- sbit DHT11_DQ_OUT=P3^2;
- sbit led1=P2^3;
- sbit led2=P2^2;
- u8 mode=0;
- uint8 temph=80,templ=10;
- uint8 temp;
- uint8 flag; //設(shè)定報(bào)警標(biāo)志
- uint8 tempvalue;
- uchar num[10]="0123456789";
- uint8 temphbuf[2];
- uint8 templbuf[2];
- uchar str1[]="Temp:"; //溫度
- uchar str2[]="TempH:"; //設(shè)定溫度上限顯示
- uchar str3[]="TempL:"; //設(shè)定溫度下限顯示
- void delay(u16 i)
- {
- while (i--);
- }
- void delay1ms(uint8 y)
- {
- uint8 x;
- for( ; y>0; y--)
- {
- for(x=110; x>0; x--);
- }
- }
- void Lcd1602_Delay1ms(uint8 c) //誤差 0us
- {
- uchar a,b;
- for (; c>0; c--)
- {
- for (b=199;b>0;b--)
- {
- for(a=1;a>0;a--);
- }
- }
-
- }
- void LcdWriteCom(uchar com) //寫入命令
- {
- LCD1602_E = 0; //使能清零
- LCD1602_RS = 0; //選擇寫入命令
- LCD1602_RW = 0; //選擇寫入
- LCD1602_DATAPINS = com; //由于4位的接線是接到P0口的高四位，所以傳送高四位不用改
- Lcd1602_Delay1ms(1);
- LCD1602_E = 1; //寫入時(shí)序
- Lcd1602_Delay1ms(5);
- LCD1602_E = 0;
- LCD1602_DATAPINS = com << 4; //發(fā)送低四位
- Lcd1602_Delay1ms(1);
- LCD1602_E = 1; //寫入時(shí)序
- Lcd1602_Delay1ms(5);
- LCD1602_E = 0;
- }
- void LcdWriteData(uchar dat) //寫入數(shù)據(jù)
- {
- LCD1602_E = 0; //使能清零
- LCD1602_RS = 1; //選擇寫入數(shù)據(jù)
- LCD1602_RW = 0; //選擇寫入
- LCD1602_DATAPINS = dat; //由于4位的接線是接到P0口的高四位，所以傳送高四位不用改
- Lcd1602_Delay1ms(1);
- LCD1602_E = 1; //寫入時(shí)序
- Lcd1602_Delay1ms(5);
- LCD1602_E = 0;
- LCD1602_DATAPINS = dat << 4; //寫入低四位
- Lcd1602_Delay1ms(1);
- LCD1602_E = 1; //寫入時(shí)序
- Lcd1602_Delay1ms(5);
- LCD1602_E = 0;
- }
- void LcdInit() //LCD初始化子程序
- {
- LcdWriteCom(0x32); //將8位總線轉(zhuǎn)為4位總線
- LcdWriteCom(0x28); //在四位線下的初始化
- LcdWriteCom(0x0c); //開顯示不顯示光標(biāo)
- LcdWriteCom(0x06); //寫一個(gè)指針加1
- LcdWriteCom(0x01); //清屏
- LcdWriteCom(0x80); //設(shè)置數(shù)據(jù)指針起點(diǎn)
- }
- char DS18B20init()
- {
- uint8 i;
- DSPORT=0;
- i=70;
- while (i--);
- DSPORT=1;
- i = 0;
- while (DSPORT)
- {
- delay1ms(1);
- i++;
- if(i>5)
- {
- return 0 ;
- }
- }
- return 1;
- } // 一位一位的傳輸字節(jié) ，先低位，后高位。
- void DS18B20writebyte(uchar dat)
- {
- uint8 i,j;
- for(i=0;i<8;i++)
- {
- DSPORT=0;
- j++;
- DSPORT=dat & 0x01;
- j=6;
- while (j--);
- DSPORT=1;
- dat >>= 1;
- }
- }
- char DS18B20readbyte() // 一位一位的接收數(shù)據(jù)
- {
- uchar byte ,b;
- uint8 i,j;
- for(i=8;i>0;i--)
- {
- DSPORT=0;
- j++;
- DSPORT=1;
- j++;
- j++;
- b=DSPORT;
- byte=(byte >> 1)|(b << 7);
- j=4;
- while(j--);
- }
- return byte ;
- }
- void DS18B20changtemp() //轉(zhuǎn)換溫度
- {
- DS18B20init();
- delay1ms(1);
- DS18B20writebyte(0xcc); //跳過ROM操作命令
- DS18B20writebyte(0x44); //溫度轉(zhuǎn)換命令
- }
- void DS18B20sendreadtempc()
- {
- DS18B20init();
- delay1ms(1);
- DS18B20writebyte(0xcc); //跳過ROM操作命令
- DS18B20writebyte(0xbe); //發(fā)送讀取溫度命令
- }
- int DS18B20readtemp()
- {
- int temp=0;
- uchar temph,templ;
- DS18B20changtemp();
- DS18B20sendreadtempc();
- templ=DS18B20readbyte(); //讀取溫度值共16位，先讀低字節(jié)
- temph=DS18B20readbyte(); //再讀高字節(jié) templ與temph位置不可調(diào)換。
- temp=temph;
- temp<<=8;
- temp|=templ;
- return temp;
- }
- void key_pros()
- {
- if(k1 == 0)
- {
- delay(1000);
- if(k1 == 0)
- {
- mode++;
- if(mode==3)
- mode=0;
- LcdWriteCom(0x01);
- }
- while(!k1);
- }
- if(mode==1)
- {
- if(k2==0)
- {
- delay(1000);
- if(k2==0)
- {
- temph++;
- if(temph>=80)temph=80;
- }
- while(!k2);
- }
- if(k3==0)
- {
- delay(1000);
- if(k3==0)
- {
- temph--;
- if(temph<=0)temph=0;
- }
- while(!k3);
- }
- }
- if(mode==2)
- {
- if(k2==0)
- {
- delay(1000);
- if(k2==0)
- {
- templ++;
- if(templ>=80)templ=80;
- }
- while(!k2);
- }
- if(k3==0)
- {
- delay(1000);
- if(k3==0)
- {
- templ--;
- if(templ<=0)templ=0;
- }
- while(!k3);
- }
- }
- }
- void lcd_init_display()
- {
- u8 i;
- for(i=0;i<5;i++)
- {
- LcdWriteCom(0x80+i);
- LcdWriteData(str1[i]);
- }
- }
- void data_pros()
- {
- u16 i;
- u16 temphbuf[2],templbuf[2];
- float dio;
- u16 k;
- tempvalue = DS18B20readtemp();
- dio=tempvalue*0.0625;
- k=dio*100+0.5;//取小數(shù)點(diǎn)后兩位有效數(shù)字
- temp=k;
- temphbuf[0]=temph/10;
- temphbuf[1]=temph%10;
- templbuf[0]=templ/10;
- templbuf[1]=templ%10;
- if(mode==0)
- {
- lcd_init_display();
- LcdWriteCom(0x85);
- LcdWriteData(num[temp/1000]);
- LcdWriteData(num[temp%1000/100]);
- LcdWriteData('.');
- LcdWriteData(num[k%100/10]);
- LcdWriteData(num[k%10]);
- LcdWriteData(0xdf);
- LcdWriteData('C');
- }
- if(mode==1) //溫度上限顯示
- {
- LcdWriteCom(0x80);
- for(i=0;i<6;i++)
- {
- LcdWriteData(str2[i]);
- }
- LcdWriteData(num[temphbuf[0]]);
- LcdWriteData(num[temphbuf[1]]);
- LcdWriteData(0xdf);
- LcdWriteData('C');
-
- }
- if(mode==2) //溫度下限顯示
- {
- for(i=0;i<6;i++)
- {
- LcdWriteCom(0x80+i);
- LcdWriteData(str3[i]);
- }
- LcdWriteData(num[templbuf[0]]);
- LcdWriteData(num[templbuf[1]]);
- LcdWriteData(0xdf);
- LcdWriteData('C');
- }
- }
- int baojinpros()
- {
- float dio;
- u16 k;
- tempvalue = DS18B20readtemp();
- dio=tempvalue*0.0625;
- k=dio*100+0.5;//取小數(shù)點(diǎn)后兩位有效數(shù)字
- tempvalue=k/100;
- if(tempvalue >= temph)
- {
- led1=0;
- led2=1;
- }
- if(tempvalue <= templ)
- {
- led1=1;
- led2=0;
-
- }
- if(tempvalue<temph&&tempvalue>templ)
- {
- led1=1;
- led2=1;
- }
- return tempvalue;
- }
- void beepxx(uint8 a)
- {
- u16 i=10;
- if(a >= temph||a <= templ)
- {
- while(i--)
- {
- beep=~beep;
- delay(10);
- }
- }
- }
- void main()
- {
- uint8 i=0,a;
- led1=1;
- led2=1;
- LcdInit();
- lcd_init_display();
- i=0;
- while(1)
- {
- key_pros();
- a=baojinpros(); //報(bào)警處理
- beepxx(a);
- data_pros();
- delay(100);
- }
- }
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