AT89C52+DS18B20温度报警器+LCD1602+独立按键Proteus仿真（代码借用江科大）

可以使用dht11温湿度传感器尝试做一下

proteus 8仿真

 江科大配套代码（本main.c代码中有AT24C02应用，本仿真中未用，加入即可，不用删除）

Delay，LCD602，key(按键)源码先前文章中已发

AT24C02.c
#include <REGX52.H>
#include "I2C.h"

#define AT24C02_ADDRESS		0xA0

/**
  * @brief  AT24C02写入一个字节
  * @param  WordAddress 要写入字节的地址
  * @param  Data 要写入的数据
  * @retval 无
  */
void AT24C02_WriteByte(unsigned char WordAddress,Data)
{
	I2C_Start();
	I2C_SendByte(AT24C02_ADDRESS);
	I2C_ReceiveAck();
	I2C_SendByte(WordAddress);
	I2C_ReceiveAck();
	I2C_SendByte(Data);
	I2C_ReceiveAck();
	I2C_Stop();
}

/**
  * @brief  AT24C02读取一个字节
  * @param  WordAddress 要读出字节的地址
  * @retval 读出的数据
  */
unsigned char AT24C02_ReadByte(unsigned char WordAddress)
{
	unsigned char Data;
	I2C_Start();
	I2C_SendByte(AT24C02_ADDRESS);
	I2C_ReceiveAck();
	I2C_SendByte(WordAddress);
	I2C_ReceiveAck();
	I2C_Start();
	I2C_SendByte(AT24C02_ADDRESS|0x01);
	I2C_ReceiveAck();
	Data=I2C_ReceiveByte();
	I2C_SendAck(1);
	I2C_Stop();
	return Data;
}

AT24C02.h
#ifndef __AT24C02_H__
#define __AT24C02_H__

void AT24C02_WriteByte(unsigned char WordAddress,Data);
unsigned char AT24C02_ReadByte(unsigned char WordAddress);


#endif

DS18B20.h
#ifndef __DS18B20_H__
#define __DS18B20_H__

void DS18B20_ConvertT(void);
float DS18B20_ReadT(void);

#endif

DS18B20.c
#include <REGX52.H>
#include "OneWire.h"

//DS18B20指令
#define DS18B20_SKIP_ROM			0xCC
#define DS18B20_CONVERT_T			0x44
#define DS18B20_READ_SCRATCHPAD 	0xBE

/**
  * @brief  DS18B20开始温度变换
  * @param  无
  * @retval 无
  */
void DS18B20_ConvertT(void)
{
	OneWire_Init();
	OneWire_SendByte(DS18B20_SKIP_ROM);
	OneWire_SendByte(DS18B20_CONVERT_T);
}

/**
  * @brief  DS18B20读取温度
  * @param  无
  * @retval 温度数值
  */
float DS18B20_ReadT(void)
{
	unsigned char TLSB,TMSB;
	int Temp;
	float T;
	OneWire_Init();
	OneWire_SendByte(DS18B20_SKIP_ROM);
	OneWire_SendByte(DS18B20_READ_SCRATCHPAD);
	TLSB=OneWire_ReceiveByte();
	TMSB=OneWire_ReceiveByte();
	Temp=(TMSB<<8)|TLSB;
	T=Temp/16.0;
	return T;
}

main.c
#include <REGX52.H>
#include "LCD1602.h"
#include "DS18B20.h"
#include "Delay.h"
#include "AT24C02.h"
#include "Key.h"
#include "Timer0.h"

float T,TShow;
char TLow,THigh;
unsigned char KeyNum;

void main()
{
	DS18B20_ConvertT();		//上电先转换一次温度，防止第一次读数据错误
	Delay(1000);			//等待转换完成
	THigh=AT24C02_ReadByte(0);	//读取温度阈值数据
	TLow=AT24C02_ReadByte(1);
	if(THigh>125 || TLow<-55 || THigh<=TLow)
	{
		THigh=20;			//如果阈值非法，则设为默认值
		TLow=15;
	}
	LCD_Init();
	LCD_ShowString(1,1,"T:");
	LCD_ShowString(2,1,"TH:");
	LCD_ShowString(2,9,"TL:");
	LCD_ShowSignedNum(2,4,THigh,3);
	LCD_ShowSignedNum(2,12,TLow,3);
	Timer0_Init();
	
	while(1)
	{
		KeyNum=Key();
		
		/*温度读取及显示*/
		DS18B20_ConvertT();	//转换温度
		T=DS18B20_ReadT();	//读取温度
		if(T<0)				//如果温度小于0
		{
			LCD_ShowChar(1,3,'-');	//显示负号
			TShow=-T;		//将温度变为正数
		}
		else				//如果温度大于等于0
		{
			LCD_ShowChar(1,3,'+');	//显示正号
			TShow=T;
		}
		LCD_ShowNum(1,4,TShow,3);		//显示温度整数部分
		LCD_ShowChar(1,7,'.');		//显示小数点
		LCD_ShowNum(1,8,(unsigned long)(TShow*100)%100,2);//显示温度小数部分
		
		/*阈值判断及显示*/
		if(KeyNum)
		{
			if(KeyNum==1)	//K1按键，THigh自增
			{
				THigh++;
				if(THigh>125){THigh=125;}
			}
			if(KeyNum==2)	//K2按键，THigh自减
			{
				THigh--;
				if(THigh<=TLow){THigh++;}
			}
			if(KeyNum==3)	//K3按键，TLow自增
			{
				TLow++;
				if(TLow>=THigh){TLow--;}
			}
			if(KeyNum==4)	//K4按键，TLow自减
			{
				TLow--;
				if(TLow<-55){TLow=-55;}
			}
			LCD_ShowSignedNum(2,4,THigh,3);	//显示阈值数据
			LCD_ShowSignedNum(2,12,TLow,3);
			AT24C02_WriteByte(0,THigh);		//写入到At24C02中保存
			Delay(5);
			AT24C02_WriteByte(1,TLow);
			Delay(5);
		}
		if(T>THigh)			//越界判断
		{
			LCD_ShowString(1,13,"OV:H");
		}
		else if(T<TLow)
		{
			LCD_ShowString(1,13,"OV:L");
		}
		else
		{
			LCD_ShowString(1,13,"    ");
		}
	}
}

void Timer0_Routine() interrupt 1
{
	static unsigned int T0Count;
	TL0 = 0x18;		//设置定时初值
	TH0 = 0xFC;		//设置定时初值
	T0Count++;
	if(T0Count>=20)
	{
		T0Count=0;
		Key_Loop();	//每20ms调用一次按键驱动函数
	}
}

Timer0.c
#include <REGX52.H>

/**
  * @brief  定时器0初始化，1毫秒@12.000MHz
  * @param  无
  * @retval 无
  */
void Timer0_Init(void)
{
	TMOD &= 0xF0;		//设置定时器模式
	TMOD |= 0x01;		//设置定时器模式
	TL0 = 0x18;		//设置定时初值
	TH0 = 0xFC;		//设置定时初值
	TF0 = 0;		//清除TF0标志
	TR0 = 1;		//定时器0开始计时
	ET0=1;
	EA=1;
	PT0=0;
}

/*定时器中断函数模板
void Timer0_Routine() interrupt 1
{
	static unsigned int T0Count;
	TL0 = 0x18;		//设置定时初值
	TH0 = 0xFC;		//设置定时初值
	T0Count++;
	if(T0Count>=1000)
	{
		T0Count=0;
		
	}
}
*/

Timer0.h
#ifndef __TIMER0_H__
#define __TIMER0_H__

void Timer0_Init(void);

#endif