可设定限制温度的单片机温度计(1602+DS18b20)仿真+代码+实物制作

ID:413948 · 发表于 2018-11-25 09:07

可设定限制温度，超过则报警，绿灯灭，在限制温度内绿灯亮

制作出来的实物图如下：

电路原理图如下：

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:

/*********************************************************************************
* 【作者】：清翔电子:03
* 【版本】： 1.0
* 【实验平台】： QX-MCS51 单片机开发板
* 【外部晶振】： 11.0592mhz
* 【主控芯片】： STC89C52
* 【编译环境】： Keil μVisio3
* 【程序功能】： 1602液晶显示18B20温度
* 【使用说明】：
* 说明：免费开源，不提供源代码分析.
**********************************************************************************/
#include <reg52.H>
#include <intrins.H>
#include <math.H>
#define uchar unsigned char
#define uint unsigned int
//sbit dula = P2^6;
//sbit wela = P2^7;
sbit rw = P3^6;
sbit RS = P3^5;
sbit LCDEN = P3^4;
sbit green=P1^0;
sbit beep=P2^3;
sbit K1=P3^0;
sbit K2=P3^1;
uchar str[5];//uchartostr函数转换的字符串
float H=380;
void delayUs()
{
_nop_();
}
void delayMs(uint a)
{
uint i, j;
for(i = a; i > 0; i--)
for(j = 100; j > 0; j--);
}
void writeComm(uchar comm)
{
RS = 0;
P0 = comm;
LCDEN = 1;
delayUs();
LCDEN = 0;
delayMs(1);
}
//写数据:RS=1, RW=0;
void writeData(uchar dat)
{
RS = 1;
P0 = dat;
LCDEN = 1;
delayUs();
LCDEN = 0;
delayMs(1);
}
void init()
{
rw = 0;
// dula = wela = 0;
writeComm(0x38);
writeComm(0x0c);
writeComm(0x06);
writeComm(0x01);
}
void writeString(uchar * str, uchar length)
{
uchar i;
for(i = 0; i < length; i++)
{
writeData(str[i]);
}
}
/**//*****************************DS18B20*******************************/
sbit ds = P2^2;
void dsInit()
{
unsigned int i;
ds = 0;
i = 100;
while(i>0) i--;
ds = 1;
i = 4;
while(i>0) i--;
}
void dsWait()
{
unsigned int i;
while(ds);
while(~ds);
i = 4;
while(i > 0) i--;
}
bit readBit()
{
unsigned int i;
bit b;
ds = 0;
i++;
ds = 1;
i++; i++;
b = ds;
i = 8;
while(i>0) i--;
return b;
}
unsigned char readByte()
{
unsigned int i;
unsigned char j, dat;
dat = 0;
for(i=0; i<8; i++)
{
j = readBit();
dat = (j << 7) | (dat >> 1);
}
return dat;
}
void writeByte(unsigned char dat)
{
unsigned int i;
unsigned char j;
bit b;
for(j = 0; j < 8; j++)
{
b = dat & 0x01;
dat >>= 1;
if(b)
{
ds = 0; i++; i++;
ds = 1;
i = 8; while(i>0) i--;
}
else
{
ds = 0;
i = 8; while(i>0) i--;
ds = 1;
i++; i++;
}
}
}
void sendChangeCmd()
{
dsInit();
dsWait();
delayMs(1);
writeByte(0xcc);
writeByte(0x44);
}
void sendReadCmd()
{
dsInit();
dsWait();
delayMs(1);
writeByte(0xcc);
writeByte(0xbe);
}
int getTmpValue()
{
unsigned int tmpvalue;
int value;
float t;
unsigned char low, high;
sendReadCmd();
low = readByte();
high = readByte();
tmpvalue = high;
tmpvalue <<= 8;
tmpvalue |= low;
value = tmpvalue;
\
t = value * 0.0625;
\
value = t * 100 + (value > 0 ? 0.5 : -0.5); //大于0加0.5, 小于0减0.5
return value;
}
void display(int v)
{
unsigned char count;
unsigned char datas[] = {0, 0, 0, 0, 0};
unsigned int tmp = abs(v);
datas[0] = tmp / 10000;
datas[1] = tmp % 10000 / 1000;
datas[2] = tmp % 1000 / 100;
datas[3] = tmp % 100 / 10;
datas[4] = tmp % 10;
writeComm(0xc0+3);
if(v < 0)
{
writeString("- ", 2);
}
else
{
writeString("+ ", 2);
}
if(datas[0] != 0)
{
writeData('0'+datas[0]);
}
for(count = 1; count != 5; count++)
{
writeData('0'+datas[count]);
if(count == 2)
{
writeData('.');
}
}
}
void lcd_dis(uchar X,uchar Y,uchar *dis) //显示数据数组
{
uchar pos;
switch(X)
{
case 0:X=0x00;
break;
case 1:X=0x40;
break;
break;
default:break;
}
pos =0x80+X+Y;
writeComm(pos); //显示地址
while(*dis!='\0')
{
writeData(*dis++);
}
}
uchar *uchartostr(float num) //将一个字节的数据转换为字符串或10进制
{
uchar x2,x1,x0,i;
x2=(int)num/100;
x1=(int)num%100/10;
x0=(int)num%100%10;
i=0;
str[i]=x2+48;
i++;
str[i]=x1+48;
i++;
str[i]='.';
i++;
str[i]=x0+48;
i++;
str[i]='\0';
return str;
}
uchar *mtostr(uchar num) //将一个字节的数据转换为字符串或10进制
{
int i=0;
str[i]=num+48;
i++;
str[i]='\0';
return str;
}
uchar key(void)
{
if(K1==0)
{
delayMs(20);
if(K1==0)
{
if(H<1000)
H++;
}
}
if(K2==0)
{
delayMs(20);
if(K2==0)
{
if(H>0)
H--;
}
}
}
/**//*****************************DS18B20*******************************/
void main()
{
green=0;
sendChangeCmd();
init();
writeComm(0x80);
writeComm( 0x80 + 4);
writeString("thermometre",10);
delayMs(1500);
writeComm( 0x01);
delayMs(15);
writeComm( 0x80 + 3);
//writeData( "" );
writeString("LIMIT",5);
while(1)
{
delayMs(100); //温度转换时间需要750ms以上
writeComm(0xc0);
lcd_dis( 0,9,uchartostr(H));
display(getTmpValue());
sendChangeCmd();
if(getTmpValue()>H*10)
{
green=1;
beep=0;
}
else
{
green=0;
beep=1;
}
key();
}
}