51单片机多路测温报警系统（AT89C51、多个DS18B20、LCD1602）

一、简介

此系统主要由AT89C51、多个DS18B20温度模块和LCD1602组成。

大致的原理是多个DS18B20按顺序采集温度到的数据传送给AT89C51的P2.7，最后通过LCD1602显示当前的实时温度，按键可以设置上下限温度，根据温度判断是否需要报警。

二、运行效果图

模拟仿真运行

三、部分代码

/*想要更多项目私wo!!!*/

#include

#include

unsigned int iTempDataH;

unsigned int SetTemp = 30;

int SetTemp1 = 1;

int num = 0;

//ÅжÏæָÁî

void Busy()

{

DATA = 0xff;

RS = 0;

RW = 1;

    while(DATA & 0x80)

    {

E = 0;

    E = 1;

    }

    E = 0;

}

//дָÁî³ÌÐò

void WriteCommand(unsigned char btCommand)

{

Busy();

RS = 0;

RW = 0;

E = 1;

DATA = btCommand;

E = 0;

}

//дÊý¾Ý³ÌÐò

void WriteData(unsigned char btData)

{

Busy();

RS = 1;

RW = 0;

E = 1;

DATA = btData;

E = 0;

}

//ÇåÆÁÏÔʾ

void Clear()

{

WriteCommand(1);

}

//³õʼ»¯

void Init()

{

WriteCommand(0x0c); //¿ªÏÔʾ,ÎÞ¹â±êÏÔʾ

WriteCommand(0x06); //ÎÄ×Ö²»¶¯£¬¹â±ê×Ô¶¯ÓÒÒÆ

WriteCommand(0x38); //ÉèÖÃÏÔʾģʽ:8λ2ÐÐ5x7µãÕó

}

//ÏÔʾµ¥¸ö×Ö·û

void DisplayOne(bit bRow, unsigned char btColumn, unsigned char btData, bit bIsNumber)

{

if (bRow) WriteCommand(0xc0 + btColumn);

else      WriteCommand(0x80 + btColumn);

if (bIsNumber) WriteData(btData + 0x30);

else            WriteData(btData);

}

//ÏÔʾ×Ö·û´®º¯Êý

void DisplayString(bit bRow, unsigned char btColumn, unsigned char *pData)

{

while (*pData != '')

    {

    if (bRow) WriteCommand(0xc0 + btColumn); //ÏÔʾÔÚµÚ1ÐÐ

    else    WriteCommand(0x80 + btColumn); //ÏÔʾÔÚµÚ0ÐÐ

WriteData(*(pData++)); //ÒªÏÔʾµÄÊý¾Ý

btColumn++; //ÁÐÊý¼ÓÒ»

    }

}

//ÑÓʱ1ms×Óº¯Êý

void Delayms(unsigned int x)

{

  unsigned char i;

while(x--)

{

for(i=0;i<200;i++);

}

}

//ÑÓʱ16us×Óº¯Êý

void Delay16us()

{

unsigned char a;

for (a = 0; a < 4; a++);

}

//ÑÓʱ60us×Óº¯Êý

void Delay60us()

{

unsigned char a;

for (a = 0; a < 18; a++);

}

//ÑÓʱ480us×Óº¯Êý

void Delay480us()

{

unsigned char a;

for (a = 0; a < 158; a++);

}

//ÑÓʱ240us×Óº¯Êý

void Delay240us()

{

unsigned char a;

for (a = 0; a < 78; a++);

}

//ÑÓʱ500ms×Óº¯Êý

void Delay500ms()

{

unsigned char a, b, c;

for (a = 0; a < 250; a++)

for (b = 0; b < 3; b++)

for (c = 0; c < 220; c++);

}

//оƬ³õʼ»¯

void Initialization()

{

while(1)

{

DQ = 0;

Delay480us(); //ÑÓʱ480us

DQ = 1;

Delay60us(); //ÑÓʱ60us

if(!DQ)  //ÊÕµ½ds18b20µÄÓ¦´ðÐźÅ

{

DQ = 1;

Delay240us(); //ÑÓʱ240us

break;

}

}

}

//дһ¸ö×Ö½Ú(´ÓµÍλ¿ªÊ¼Ð´)

void WriteByte(unsigned char btData)

{

unsigned char i, btBuffer;

for (i = 0; i < 8; i++)

{

btBuffer = btData >> i;

if (btBuffer & 1)

{

DQ = 0;

_nop_();

_nop_();

DQ = 1;

Delay60us();

}

else

{

DQ = 0;

Delay60us();

DQ = 1;

}

}

}

//¶ÁÒ»¸ö×Ö½Ú(´ÓµÍλ¿ªÊ¼¶Á)

unsigned char ReadByte()

{

unsigned char i, btDest;

for (i = 0; i < 8; i++)

{

btDest >>= 1;

DQ = 0;

_nop_();

_nop_();

DQ = 1;

Delay16us();

if (DQ) btDest |= 0x80; 

Delay60us();

}

return btDest;

}

//ÐòÁкÅÆ¥Åä

void MatchROM(const unsigned char *pMatchData)

{

unsigned char i;

Initialization();

WriteByte(MATCH_ROM);

for (i = 0; i < 8; i++) WriteByte(*(pMatchData + i));

}

//Êý¾Ý´¦Àí×Ó³ÌÐò

void DataProcess()

{

m_TempData = ReadTemperature();

if (m_TempData.btNegative) DisplayOne(1, 6, '-', 0);

else DisplayOne(1, 6, m_TempData.btThird, 1);

DisplayOne(1, 7, m_TempData.btSecond, 1);

DisplayOne(1, 8, m_TempData.btFirst, 1);

DisplayOne(1, 10, m_TempData.btDecimal, 1);

}

int main(void)

{

Clear();

Init();

DisplayString(0, 0, "T1:    T2:    ");

DisplayString(1, 0, "CurT:");

DisplayOne(1, 9, '.', 0);

while (1) 

DataProcess();

}