实现功能：

1、对温度、湿度进行采集
2、可以警报提示、修改温度、湿度上下限值
3、lcd显示相关信息

原理图：

部分程序：

#include

#define uint unsigned int

#define uchar unsigned char

#include

typedef bit BOOL ;

sbit io = P1^1 ;//(口线定义)

sbit bee=P1^0;

sbit rs = P2^5 ;

sbit rw = P2^6 ;

sbit ep = P2^7 ;

bit flag_300ms ;

sbit K1=P1^2;

sbit K2=P1^3;

sbit K3=P1^4;

uchar yemian=0;//（定义变量）

uchar flat=1;

uchar data_byte;

uchar RH,RL,TH,TL;

uchar WenDu,ShiDu;//报警的温度和湿度

#include "eeprom52.h"

/****************************延时程序****************************/

void delay(uchar ms)

{ // 延时子程序

uchar i ;

while(ms--)

{

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

}

}

void delay1()//延时10us

{

uchar i;

i--;

i--;

i--;

i--;

i--;

i--;

}

void longdelay(uchar s) //长延时

{

while(s--)

{

delay(20) ;

}

}

/******************把数据保存到单片机内部eeprom中******************/

void write_eeprom()

{

SectorErase(0x2000);

byte_write(0x2000, WenDu);

byte_write(0x2001, ShiDu);

byte_write(0x2060, a_a);

}

/******************把数据从单片机内部eeprom中读出来*****************/

void read_eeprom()

{

WenDu = byte_read(0x2000);

ShiDu = byte_read(0x2001);

a_a = byte_read(0x2060);

}

/**************开机自检eeprom初始化*****************/

void init_eeprom()

{

read_eeprom(); //先读

if(a_a != 2) //新的单片机初始单片机内问eeprom

{

WenDu = 30;

ShiDu = 80;

a_a = 2;

write_eeprom();

}

}

if( TH{

bee=1; //停止报警

}

}

/************************LCD模块******************************************/

BOOL lcd_bz()//测试LCD忙碌状态

rs = 0 ;

rw = 0 ;

ep = 0 ;

P0 = cmd ;

ep = 1 ;

ep = 0 ;

}

void write_addr(uchar addr)//写地址

{

write_cmd(addr|0x80) ;

}

void write_byte(uchar dat)//写字节

{

while(lcd_bz()) ;

rs = 1 ;

rw = 0 ;

ep = 0 ;

P0 = dat ;

ep = 1 ;

ep = 0 ;

}

void lcd_init()// 初始化

{

write_cmd(0x38) ;

delay(1);

write_cmd(0x08) ;

delay(1);

write_cmd(0x01) ;

delay(1);

write_cmd(0x06) ;

delay(1);

write_cmd(0x0c) ;

delay(1);

}

data_byte<<=1;

data_byte|=temp;

}

return data_byte;

}

void receive()//接收数据

{

uchar T_H,T_L,R_H,R_L,check,num_check;

uchar count;

start();//开始信号

io=1;

if(!io)//读取DHT11响应信号

{

while((io)&&count++);

R_H=receive_byte();

R_L=receive_byte();

T_H=receive_byte();

T_L=receive_byte();

check=receive_byte();

io=0;//拉低延时50us

delay1();delay1();delay1();delay1();delay1();

io=1;

num_check=R_H+R_L+T_H+T_L;

if(num_check=check)

{

RH=R_H;

RL=R_L;

TH=T_H;

TL=T_L;

check=num_check;

}

}

}