DS18B20能直接测出环境温度吗?它的输出信号需要先经过AD转换后再送入单片机么?因为我测人体温度(用的红外)要先知道环境温度
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/02 04:38:16
![DS18B20能直接测出环境温度吗?它的输出信号需要先经过AD转换后再送入单片机么?因为我测人体温度(用的红外)要先知道环境温度](/uploads/image/z/6551227-19-7.jpg?t=DS18B20%E8%83%BD%E7%9B%B4%E6%8E%A5%E6%B5%8B%E5%87%BA%E7%8E%AF%E5%A2%83%E6%B8%A9%E5%BA%A6%E5%90%97%3F%E5%AE%83%E7%9A%84%E8%BE%93%E5%87%BA%E4%BF%A1%E5%8F%B7%E9%9C%80%E8%A6%81%E5%85%88%E7%BB%8F%E8%BF%87AD%E8%BD%AC%E6%8D%A2%E5%90%8E%E5%86%8D%E9%80%81%E5%85%A5%E5%8D%95%E7%89%87%E6%9C%BA%E4%B9%88%3F%E5%9B%A0%E4%B8%BA%E6%88%91%E6%B5%8B%E4%BA%BA%E4%BD%93%E6%B8%A9%E5%BA%A6%EF%BC%88%E7%94%A8%E7%9A%84%E7%BA%A2%E5%A4%96%EF%BC%89%E8%A6%81%E5%85%88%E7%9F%A5%E9%81%93%E7%8E%AF%E5%A2%83%E6%B8%A9%E5%BA%A6)
DS18B20能直接测出环境温度吗?它的输出信号需要先经过AD转换后再送入单片机么?因为我测人体温度(用的红外)要先知道环境温度
DS18B20能直接测出环境温度吗?它的输出信号需要先经过AD转换后再送入单片机么?
因为我测人体温度(用的红外)要先知道环境温度
DS18B20能直接测出环境温度吗?它的输出信号需要先经过AD转换后再送入单片机么?因为我测人体温度(用的红外)要先知道环境温度
不用经过AD,单片机只需通过一个I/O口就可以把DS18B20的数据读出来,主要是要编程.
把程序写给你吧.程序里面的数组数据是我自己接的数码管显示数字数据,你应用时注意改就好.DS与单片机的接口也能自己决定,不必和我一样.
//安装目录下的EXE文件打开后可在电脑上显示当前温度值
#include
#define uchar unsigned char
#define uint unsigned int
sbit DS=P1^0; //define interface
uint temp; // variable of temperature
uchar flag1; // sign of the result positive or negative
//sbit dula=P2^6;
//sbit wela=P2^7;
//unsigned char code table2[]={0x3f,0x30,0x5b,0x4f,0x66,0x6d,0x7d,
// 0x07,0x7f,0x67/*,0x77,0x7c,0x39,0x5e,0x79,0x71*/};
//unsigned char code table1[]={0xbf,0xb0,0xdb,0xcf,0xe6,0xed,0xfd,
// 0x87,0xff,0xe7};
//unsigned char code table2[]={0x40,0x5e,0x24,0x21,0x13,0x09,0x08,
// 0x63,0x00,0x03/*,0x77,0x7c,0x39,0x5e,0x79,0x71*/};
//unsigned char code table1[]={0xc0,0xde,0xa4,0xa1,0x93,0x89,0x88,
// 0xe7,0x8f,0x87};
unsigned char code table5[]={0x77,0x22,0x6d,0x5d,0x1e,0x5b,0x7b,
0x15,0x7f,0x1f};
unsigned char code table6[]={0xf7,0xa2,0xed,0xdd,0x9e,0xdb,0xfb,
0x95,0xff,0x9f};
void delay(uint count) //delay
{
uint i;
while(count)
{
i=200;
while(i>0)
i--;
count--;
}
}
///////功能:串口初始化,波特率9600,方式1///////
void Init_Com(void)
{
TMOD = 0x20;
PCON = 0x00;
SCON = 0x50;
TH1 = 0xFd;
TL1 = 0xFd;
TR1 = 1;
}
void dsreset(void) //send reset and initialization command 18B20复位,初始化函数
{
uint i;
DS=0;
i=103;
while(i>0)i--;
DS=1;
i=4;
while(i>0)i--;
}
bit tmpreadbit(void) //read a bit 读1位数据函数
{
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 读1字节函数
{
uchar i,j,dat;
dat=0;
for(i=1;i1;
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 开始获取数据并转换
{
dsreset();
delay(1);
tmpwritebyte(0xcc); // address all drivers on bus 写跳过读ROM指令
tmpwritebyte(0x44); // initiates a single temperature conversion 写温度转换指令
}
uint tmp() //get the temperature 读取寄存器中存储的温度数据
{
float tt;
uchar a,b;
dsreset();
delay(1);
tmpwritebyte(0xcc);
tmpwritebyte(0xbe);
a=tmpread(); //读低8位
b=tmpread(); //读高8位
temp=b;
temp0;b--);
}
void display(uint temp)//显示程序
{
uchar A1,A2,A2t,A3,ser;
ser=temp/10;
SBUF=ser;
A1=temp/100;
A2t=temp%100;
A2=A2t/10;
A3=A2t%10;
//dula=0;
d4=0;
P0=table5[A1];
delay(1);
d4=1;//显示百位
//dula=1;
// dula=0;
/*wela=0;
P0=0x7e;
wela=1;
wela=0;*/
//dula=0;
d3=0;
P0=table6[A2];
delay(1);
d3=1;//显示十位
//dula=1;
//dula=0;
/*wela=0;
P0=0x7d;
wela=1;
wela=0; */
d2=0;
P0=table5[A3];
delay(1);
d2=1;//显示个位
//dula=1;
//dula=0;
/*P0=0x7b;
wela=1;
wela=0; */
}
void main()
{
uchar a;
Init_Com();
do
{
tmpchange();
// delay(200);
for(a=1;a>0;a--)
{ display(tmp());
}
} while(1);
}
//安装目录下的EXE文件打开后可在电脑上显示当前温度值
#include
#define uchar unsigned char
#define uint unsigned int
sbit DS=P1^0; //define interface
uint temp; // variable of temperature
uchar flag1; // sign of the result positive or negative
//sbit dula=P2^6;
//sbit wela=P2^7;
//unsigned char code table2[]={0x3f,0x30,0x5b,0x4f,0x66,0x6d,0x7d,
// 0x07,0x7f,0x67/*,0x77,0x7c,0x39,0x5e,0x79,0x71*/};
//unsigned char code table1[]={0xbf,0xb0,0xdb,0xcf,0xe6,0xed,0xfd,
// 0x87,0xff,0xe7};
//unsigned char code table2[]={0x40,0x5e,0x24,0x21,0x13,0x09,0x08,
// 0x63,0x00,0x03/*,0x77,0x7c,0x39,0x5e,0x79,0x71*/};
//unsigned char code table1[]={0xc0,0xde,0xa4,0xa1,0x93,0x89,0x88,
// 0xe7,0x8f,0x87};
unsigned char code table5[]={0x77,0x22,0x6d,0x5d,0x1e,0x5b,0x7b,
0x15,0x7f,0x1f};
unsigned char code table6[]={0xf7,0xa2,0xed,0xdd,0x9e,0xdb,0xfb,
0x95,0xff,0x9f};
void delay(uint count) //delay
{
uint i;
while(count)
{
i=200;
while(i>0)
i--;
count--;
}
}
///////功能:串口初始化,波特率9600,方式1///////
void Init_Com(void)
{
TMOD = 0x20;
PCON = 0x00;
SCON = 0x50;
TH1 = 0xFd;
TL1 = 0xFd;
TR1 = 1;
}
void dsreset(void) //send reset and initialization command 18B20复位,初始化函数
{
uint i;
DS=0;
i=103;
while(i>0)i--;
DS=1;
i=4;
while(i>0)i--;
}
bit tmpreadbit(void) //read a bit 读1位数据函数
{
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 读1字节函数
{
uchar i,j,dat;
dat=0;
for(i=1;i1;
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 开始获取数据并转换
{
dsreset();
delay(1);
tmpwritebyte(0xcc); // address all drivers on bus 写跳过读ROM指令
tmpwritebyte(0x44); // initiates a single temperature conversion 写温度转换指令
}
uint tmp() //get the temperature 读取寄存器中存储的温度数据
{
float tt;
uchar a,b;
dsreset();
delay(1);
tmpwritebyte(0xcc);
tmpwritebyte(0xbe);
a=tmpread(); //读低8位
b=tmpread(); //读高8位
temp=b;
temp0;b--);
}
void display(uint temp)//显示程序
{
uchar A1,A2,A2t,A3,ser;
ser=temp/10;
SBUF=ser;
A1=temp/100;
A2t=temp%100;
A2=A2t/10;
A3=A2t%10;
//dula=0;
d4=0;
P0=table5[A1];
delay(1);
d4=1;//显示百位
//dula=1;
// dula=0;
/*wela=0;
P0=0x7e;
wela=1;
wela=0;*/
//dula=0;
d3=0;
P0=table6[A2];
delay(1);
d3=1;//显示十位
//dula=1;
//dula=0;
/*wela=0;
P0=0x7d;
wela=1;
wela=0; */
d2=0;
P0=table5[A3];
delay(1);
d2=1;//显示个位
//dula=1;
//dula=0;
/*P0=0x7b;
wela=1;
wela=0; */
}
void main()
{
uchar a;
Init_Com();
do
{
tmpchange();
// delay(200);
for(a=1;a>0;a--)
{ display(tmp());
}
} while(1);
}