多点测温 + 1602显示仿真原理图如下（proteus仿真工程文件可到本帖附件中下载）
单片机源程序如下:
- #include<reg52.h>
- #include<math.h>
- #define uint unsigned int
- #define uchar unsigned char
- #define lcddata P0
- sbit rs=P2^0;
- sbit rw=P2^1;
- sbit e=P2^2;
- sbit DQ=P2^3;
- sbit key=P3^7;
- uchar temp1[]={"T : "};
- uchar temp2[]={"T : "};
- /*uchar temp3[9]={"T3: "};
- uchar temp4[9]={"T4: "};
- uchar temp5[9]={"T5: "};
- uchar temp6[9]={"Ta: "};*/
- uchar code ds_rom1[]={0x28,0x22,0x22,0x22,0x00,0x00,0x00,0xca};//U2ROM
- uchar code ds_rom2[]={0x28,0x33,0x33,0x33,0x00,0x00,0x00,0xa0};//U3ROM
- uchar code ds_rom3[]={0x28,0x44,0x44,0x44,0x00,0x00,0x00,0xAF};//U4ROM
- uchar code ds_rom4[]={0x28,0x55,0x55,0x55,0x00,0x00,0x00,0xC5};//U5ROM
- uchar code ds_rom5[]={0x28,0x66,0x66,0x66,0x00,0x00,0x00,0x7B};//U6ROM
- int temp;//温度
- bit temp_flag,value_flag;//正负标志位
- int t1,t2,t3,t4,t5,num=1;
- /*1602LCD函数*/
- void delay(uint x)
- {
- uint a,b;
- for(a=x;a>0;a--)
- for(b=110;b>0;b--);
- }
- void writelcd(uchar dat,bit x)//写0指令，1数据
- {
- e=0;
- lcddata=dat;
- rs=x;
- rw=0;
- e=1;
- delay(1);
- e=0;
- }
- void initlcd()
- {
- writelcd(0x38,0);
- writelcd(0x0c,0);
- writelcd(0x06,0);
- writelcd(0x01,0);
- }
- /*DS18B20*/
- void delayus(uchar x)// 延时1us
- {
- while(--x);
- }
- bit init_DS18B20()//初始化函数
- {
- bit Status_DS18B20;
- DQ=1;
- DQ=0;
- delayus(250);
- DQ=1;
- delayus(20);
- if(!DQ)
- Status_DS18B20=0;
- else
- Status_DS18B20=1;
- delayus(250);
- DQ=1;
- return Status_DS18B20;
- }
- uchar read_DS18B20()//读数据
- {
- uchar i=0,dat=0;
- for(i=0;i<8;i++)
- {
- DQ=1;
- DQ=0;
- dat>>=1;
- DQ=1;
- if(DQ)
- dat|=0x80;
- DQ=1;
- delayus(25);
- }
- return(dat);
- }
- void write_DS18B20(uchar dat)//写数据
- {
- uchar i;
- for(i=0;i<8;i++)
- {
- DQ=1;
- dat>>=1;
- DQ=0;
- DQ=CY;
- delayus(25);
- DQ=1;
- }
- }
- void Match_rom(uchar a) //匹配ROM
- {
- uchar j;
- write_DS18B20(0x55); //发送匹配ROM命令
- if(a==1)
- {
- for(j=0;j<8;j++)
- write_DS18B20(ds_rom1[j]); //发送18B20的序列号，先发送低字节
- }
- if(a==2)
- {
- for(j=0;j<8;j++)
- write_DS18B20(ds_rom2[j]); //发送18B20的序列号，先发送低字节
- }
- if(a==3)
- {
- for(j=0;j<8;j++)
- write_DS18B20(ds_rom3[j]); //发送18B20的序列号，先发送低字节
- }
- if(a==4)
- {
- for(j=0;j<8;j++)
- write_DS18B20(ds_rom4[j]); //发送18B20的序列号，先发送低字节
- }
- if(a==5)
- {
- for(j=0;j<8;j++)
- write_DS18B20(ds_rom5[j]); //发送18B20的序列号，先发送低字节
- }
- }
-
- void gettemp(uchar z)/*读取温度值并转换*/
- {
- uchar a,b;
- while(init_DS18B20());
- if(z==1)
- {
- Match_rom(1); //匹配ROM 1
- }
- if(z==2)
- {
- Match_rom(2); //匹配ROM 2
- }
- if(z==3)
- {
- Match_rom(3); //匹配ROM 3
- }
- if(z==4)
- {
- Match_rom(4); //匹配ROM 4
- }
- if(z==5)
- {
- Match_rom(5); //匹配ROM 5
- }
- write_DS18B20(0x44);//*启动温度转换*/
- while(init_DS18B20());
- if(z==1)
- {
- Match_rom(1); //匹配ROM 1
- }
- if(z==2)
- {
- Match_rom(2); //匹配ROM 2
- }
- if(z==3)
- {
- Match_rom(3); //匹配ROM 3
- }
- if(z==4)
- {
- Match_rom(4); //匹配ROM 4
- }
- if(z==5)
- {
- Match_rom(5); //匹配ROM 5
- }
- write_DS18B20(0xbe);//*读取温度*/
- a=read_DS18B20();
- b=read_DS18B20();
- temp=b;
- temp<<=8;
- temp=temp|a;
- if(b>=8)
- {
- temp=~temp+1;
- temp_flag=1;
- }
- else
- {
- temp_flag=0;
- }
- if(temp_flag==1)
- temp=temp*0.625*-1;
- if(temp_flag==0)
- temp=temp*0.625;
- if(z==1)
- t1=temp;
- if(z==2)
- t2=temp;
- if(z==3)
- t3=temp;
- if(z==4)
- t4=temp;
- if(z==5)
- t5=temp;
- }
- void display(uchar i)//显示函数
- {
- char y,value;
- temp=abs(temp);
- if(i==1)
- {
- temp1[1]=i+0x30;
- if(temp<100)
- temp1[4]=' ';
- else
- temp1[4]=temp%1000/100+0x30;
- temp1[5]=temp%100/10+0x30;
- temp1[6]='.';
- temp1[7]=temp%10+0x30;
- temp1[8]=0xdf;
- temp1[9]='C';
- writelcd(0x80,0);
- for(y=0;y<10;y++)
- writelcd(temp1[y],1);
- }
- if(i==2)
- {
- temp2[1]=i+0x30;
- if(temp<100)
- temp2[4]=' ';
- else
- temp2[4]=temp%1000/100+0x30;
- temp2[5]=temp%100/10+0x30;
- temp2[6]='.';
- temp2[7]=temp%10+0x30;
- temp2[8]=0xdf;
- temp2[9]='C';
- writelcd(0xc0,0);
- for(y=0;y<10;y++)
- writelcd(temp2[y],1);
- }
- if(i==3)
- {
- temp1[1]=i+0x30;
- if(temp<100)
- temp1[4]=' ';
- else
- temp1[4]=temp%1000/100+0x30;
- temp1[5]=temp%100/10+0x30;
- temp1[6]='.';
- temp1[7]=temp%10+0x30;
- temp1[8]=0xdf;
- temp1[9]='C';
- writelcd(0x80,0);
- for(y=0;y<10;y++)
- writelcd(temp1[y],1);
- }
- if(i==4)
- {
- temp2[1]=i+0x30;
- if(temp<100)
- temp2[4]=' ';
- else
- temp2[4]=temp%1000/100+0x30;
- temp2[5]=temp%100/10+0x30;
- temp2[6]='.';
- temp2[7]=temp%10+0x30;
- temp2[8]=0xdf;
- temp2[9]='C';
- writelcd(0xc0,0);
- for(y=0;y<10;y++)
- writelcd(temp2[y],1);
- }
- if(i==5)
- {
- temp1[1]=i+0x30;
- if(temp<100)
- temp1[4]=' ';
- else
- temp1[4]=temp%1000/100+0x30;
- temp1[5]=temp%100/10+0x30;
- temp1[6]='.';
- temp1[7]=temp%10+0x30;
- temp1[8]=0xdf;
- temp1[9]='C';
- writelcd(0x80,0);
- for(y=0;y<10;y++)
- writelcd(temp1[y],1);
- }
- if(i==6)
- {
- value=(t1+t2+t3+t4+t5)/5;
- if(value<0)
- {
- value_flag=1;
- value=value*-1;
- }
- else
- value_flag=0;
- if(value_flag==1)
- temp2[3]='-';
- else
- temp2[3]=' ';
- temp2[1]='a';
- if(temp<100)
- temp2[4]=' ';
- else
- temp2[4]=value%1000/100+0x30;
- temp2[5]=value%100/10+0x30;
- temp2[6]='.';
- temp2[7]=value%10+0x30;
- temp2[8]=0xdf;
- temp2[9]='C';
- writelcd(0xc0,0);
- for(y=0;y<10;y++)
- writelcd(temp2[y],1);
- }
- if(temp_flag==1)
- {
- temp1[3]='-';
- temp2[3]='-';
-
- }
- else
- {
- temp1[3]=' ';
- temp2[3]=' ';
- }
- }
- void initT0()
- {
- TMOD=0x01;
- TH0=(65536-50000)/256;
- TL0=(65536-50000)%256;
- EA=1;
- ET0=1;
- TR0=1;
- }
- void keyscan()
- {
- if(key==0)
- {
- delay(5);
- if(key==0)
- {
- TR0=0;
- while(!key);
- TR0=1;
- }
- }
- }
- void main()
- {
- initlcd();
- initT0();
- while(1)
- {
- keyscan();
- if(num==1)//第一页
- {
- gettemp(1);
- ……………………
- …………限于本文篇幅 余下代码请从51黑下载附件…………
所有资料51hei提供下载:
DS18B20.zip
(77.98 KB, 下载次数: 402)
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