/********************DHT11.h********************/

#ifndef DHT11_H
#define DHT11_H

#include <reg52.h>
#include "common.h"

//溫濕度傳感器DHT11數(shù)據(jù)接口
sbit DHT11Dout = P2^0;

uchar DHT11ReceiveByte(void);
void DHT11ReadData(void);

#endif

 

/********************DHT11.c********************/

#include "DHT11.h"
#include "system.h"

/*uchar DHT11Data[6]
用來保存當(dāng)前的溫度、濕度
[0:1]濕度整數(shù)部分  
[2]濕度小數(shù)部分           
[3:4]溫度整數(shù)部分            
[5]溫度小數(shù)部分
*/
uchar DHT11Data[6]={0, 0, 0, 0, 0, 0}; 

static void delay_25ms(void)   //誤差 0us
{
    unsigned char a,b,c;
    for(c=7;c>0;c--)
        for(b=16;b>0;b--)
            for(a=110;a>0;a--);
}

static void delay_30us(void)   //誤差 0us
{
    unsigned char a,b;
    for(b=3;b>0;b--)
        for(a=3;a>0;a--);
}

uchar DHT11ReceiveByte(void)
{
 uchar i;
 uchar com_data, temp;
        
 for(i=0; i<=7; i++)
 {
  while(!DHT11Dout);
  delay_30us();
  temp = 0;
  if(DHT11Dout){temp = 1;}   
  while(DHT11Dout);  
  com_data <<= 1;                 
  com_data |= temp; 
 }           
 return com_data; 
}

void DHT11ReadData(void)
{  
 uint untemp=0;
 uint TH_data=0, TL_data=0, RH_data=0, RL_data=0, CK_data=0; 
 uint TH_temp=0, TL_temp=0, RH_temp=0, RL_temp=0, CK_temp=0; 
 
 while(1){
  //主機(jī)拉低必須大于18ms    
  DHT11Dout = 0;
  delay_25ms();
  DHT11Dout = 1;
  //DATA總線由上拉電阻拉高主機(jī)延時(shí)30us          
  delay_30us();                   
  //判斷DHT11是否有低電平響應(yīng)信號(hào)如不響應(yīng)則跳出，響應(yīng)則向下運(yùn)行              
  if(!DHT11Dout){
   //判斷DHT11發(fā)出 80us 的低電平響應(yīng)信號(hào)是否結(jié)束 
   while(!DHT11Dout);
   //判斷從機(jī)是否發(fā)出 80us 的高電平，如發(fā)出則進(jìn)入數(shù)據(jù)接收狀態(tài)                  
   while(DHT11Dout); 
   //數(shù)據(jù)接收狀態(tài)                    
   
   RH_temp = DHT11ReceiveByte(); //8bit溫度整數(shù)數(shù)據(jù)                
   RL_temp = DHT11ReceiveByte(); //8bit溫度小數(shù)數(shù)據(jù)
   TH_temp = DHT11ReceiveByte(); //8bit濕度整數(shù)數(shù)據(jù)
   TL_temp = DHT11ReceiveByte(); //8bit濕度小數(shù)數(shù)據(jù)
   CK_temp = DHT11ReceiveByte(); //8bit校驗(yàn)位
   delay_30us();
   delay_30us();
   DHT11Dout = 1;  
   //數(shù)據(jù)校驗(yàn)                  
   untemp = RH_temp + RL_temp + TH_temp + TL_temp;                 
   if(untemp==CK_temp){
    RH_data = RH_temp;
    RL_data = RL_temp;
    TH_data = TH_temp;
    TL_data = TL_temp;
    CK_data = CK_temp;
    break;//跳出while循環(huán)
   }
  } 
 }  
 //濕度整數(shù)部分 
 DHT11Data[0] = RH_data/10;           
 DHT11Data[1] = RH_data%10;  
 //濕度小數(shù)部分 不做處理          
 DHT11Data[2] = RL_data ;//轉(zhuǎn)為小數(shù)時(shí)除以256即可
 //溫度整數(shù)部分           
 DHT11Data[3] = TH_data/10;         
 DHT11Data[4] = TH_data%10;   
 //溫度小數(shù)部分  不做處理           
 DHT11Data[5] = TL_data; //轉(zhuǎn)為小數(shù)時(shí)除以256即可
}

 

/*************************system.h*****************************/

#ifndef SYSTEM_H
#define SYSTEM_H

#include "common.h"

//蜂鳴器、LED報(bào)警接口
sbit AlarmBuzzer = P2^4; //響：聲報(bào)警
sbit LED4 = P3^5;   //亮：光報(bào)警

//工作情況指示燈:
sbit LED3 = P3^6; //亮：啟動(dòng)制冷
sbit LED2 = P3^7; //亮：啟動(dòng)抽濕

void SystemInit(void);
void SystemControl(void);
void SystemSet(void);
void SystemInformationDisplay(void);

#endif

/***********************system.c************************/

#include "system.h"
#include "lcd1602.h"
#include "DHT11.h"
#include "key.h"
#include "eeprom.h"

uchar TemperatureLimit = 32; //溫度上限值
uchar GlobeTemperature = 30;//要設(shè)置的溫度
uchar TemperatureMin = 6; //溫度值下限值

uchar HumidityLimit = 80;  //濕度上限值
uchar GlobeHumidity = 66; //要設(shè)置的濕度
uchar HumidityMin = 10;  //濕度下限值

uchar SYSTEM_FLAGS = 0; //如果系統(tǒng)不是第一次啟動(dòng)過，則設(shè)置為1，否為0
uchar flg = 0;//按鍵控制

extern uchar DHT11Data[6];

//系統(tǒng)初始化
void SystemInit(void)
{
 uchar *Project = "Granary Control";
 uchar *Designer = "Designer: HongDe";
 
 AlarmBuzzer = 1;
 LED4 = 0;
 LED3 = 0;
 LED2 = 0;
 
 LcdInit();  //初始化LCD   
 DelayMs(10);
 LcdSetPosition(1); //設(shè)置顯示位置
 while(*Project != '\0'){//在LCD1602第1行顯示“Granary Control”
  LcdWriteData(*Project);
  Project++;
 }

 LcdSetPosition(0x40); //設(shè)置顯示位置
 while(*Designer != '\0'){//在LCD1602第1行顯示“Granary Control”
  LcdWriteData(*Designer);
  Designer++;
 }

 SYSTEM_FLAGS = eepromReadByte(0x2016);//從第一扇區(qū)讀系統(tǒng)啟動(dòng)參數(shù)
 if(SYSTEM_FLAGS==1){//如果系統(tǒng)不是第一次啟動(dòng)過，則讀取先前存儲(chǔ)的參數(shù)值
  GlobeTemperature = eepromReadByte(0x2000);//讀取存放在eeprom中的溫度節(jié)點(diǎn)值
  TemperatureLimit = eepromReadByte(0x2004); //讀取存放在eeprom中的溫度安全節(jié)點(diǎn)值
  GlobeHumidity = eepromReadByte(0x2008); //讀取存放在eeprom中的濕度節(jié)點(diǎn)值
  HumidityLimit = eepromReadByte(0x2012); //讀取存放在eeprom中的濕度安全節(jié)點(diǎn)值
 }
}

void SystemControl(void)
{
 uchar temp=0;
 uchar rh=0;
 
 DHT11ReadData();//獲取溫度、濕度
 temp = DHT11Data[3]*10 + DHT11Data[4]; //溫度整數(shù)部分
 rh = DHT11Data[0]*10 + DHT11Data[1];//濕度整數(shù)部分，小數(shù)部分未處理
 if((rh>HumidityLimit)||(temp>TemperatureLimit)){//當(dāng)前溫度高于安全點(diǎn)溫度或者當(dāng)前濕度高于安全點(diǎn)濕度
  while(1){
   //更新當(dāng)前環(huán)境溫度
   DHT11ReadData();//獲取溫度、濕度
   rh= DHT11Data[0]*10 + DHT11Data[1];//濕度整數(shù)部分，小數(shù)部分未處理
   temp = DHT11Data[3]*10+DHT11Data[4];
   
   if(temp>TemperatureLimit)LED3 = 1; //啟動(dòng)制冷 
   if(rh>HumidityLimit)LED2 = 1; //啟動(dòng)抽濕
   LED4 = ~LED4; //燈亮閃爍報(bào)警
   AlarmBuzzer = ~AlarmBuzzer; //蜂鳴器鳴叫
   DelayMs(5);
   
   if((temp<TemperatureLimit)&&(temp<GlobeTemperature)){LED3 = 0; LED4 = 0; AlarmBuzzer = 1;}//停止制冷
   if((rh<HumidityLimit)&&(rh<GlobeHumidity)){LED2 = 0; LED4 = 0; AlarmBuzzer = 1;}//停止抽濕
   if((rh<HumidityLimit)&&(temp<TemperatureLimit)){LED4 = 0; break;}//停止報(bào)警
   SystemSet();//設(shè)置
   SystemInformationDisplay();//溫濕度顯示
  }
 }
 if(temp>GlobeTemperature){
  LED3 = 1; //啟動(dòng)制冷
 }else{LED3 = 0;}//關(guān)閉制冷
 
 if(rh>GlobeHumidity){
  LED2 = 1; //啟動(dòng)抽濕
 }else{LED2 = 0;}//停止抽濕
 AlarmBuzzer = 1;
}

void SystemSet(void)
{
 uchar key;
 uchar eepromFlags = 0;
 
 key = ScanKey();
 if(key==SW2){//按下按鍵SW2
  flg++;
  if(flg==5){flg = 1;}
 }

 switch(flg){
  case 1:{//溫度節(jié)點(diǎn)調(diào)節(jié)（即溫度節(jié)點(diǎn)）
   if(key==SW1){ --GlobeTemperature; eepromFlags = 1;}//減操作
   if(key==SW3){ ++GlobeTemperature; eepromFlags = 1;}//加操作
   
   if(GlobeTemperature==TemperatureMin-1)GlobeTemperature = TemperatureLimit;
   if(GlobeTemperature==TemperatureLimit+1)GlobeTemperature = TemperatureMin;
   break;
  }
  
  case 2:{//溫度安全節(jié)點(diǎn)調(diào)節(jié)
   if(key==SW1){ --TemperatureLimit; eepromFlags = 1;}//減操作
   if(key==SW3){ ++TemperatureLimit; eepromFlags = 1;}//加操作
   break;
  }
  case 3:{//濕度節(jié)點(diǎn)調(diào)節(jié)
   if(key==SW1){ --GlobeHumidity; eepromFlags = 1;}//減操作
   if(key==SW3){ ++GlobeHumidity; eepromFlags = 1;}//加操作
   
   if(GlobeHumidity==HumidityMin-1)GlobeHumidity = HumidityLimit;
   if(GlobeHumidity==HumidityLimit+1)GlobeHumidity = HumidityMin;
   break;
  }
  case 4:{ //濕度安全節(jié)點(diǎn)調(diào)節(jié)
   if(key==SW1){--HumidityLimit; eepromFlags = 1;}//減操作
   if(key==SW3){++HumidityLimit; eepromFlags = 1;}//加操作
   break;
  }
  default: eepromFlags = 0; break;
 }
 if(eepromFlags){//系統(tǒng)工作參數(shù)有變動(dòng)，參數(shù)存eeprom
  eepromErase(0x2000);//擦除第一個(gè)扇區(qū)
  eepromWriteByte(0x2000, GlobeTemperature);//存放溫度節(jié)點(diǎn)值
  eepromWriteByte(0x2004, TemperatureLimit); //存放溫度安全節(jié)點(diǎn)值
  eepromWriteByte(0x2008, GlobeHumidity); //存放濕度節(jié)點(diǎn)值
  eepromWriteByte(0x2012, HumidityLimit); //存放濕度安全節(jié)點(diǎn)值
  SYSTEM_FLAGS = 1;
  eepromWriteByte(0x2016, SYSTEM_FLAGS); //存放系統(tǒng)啟動(dòng)過的標(biāo)志
 }
}

//顯示溫濕度信息
//顯示設(shè)置的溫濕度值，和當(dāng)前環(huán)境的溫濕度值
void SystemInformationDisplay(void)
{
 char *TempStr = "t/tS/TH:";
 char *RHStr = "r/rS/RH:";
 uchar i=0;
 
 LCDClear();
 LcdSetPosition(0x40); //設(shè)置濕度顯示在中間位置,第2行
 while(*RHStr != '\0'){
  LcdWriteData(*RHStr);
  RHStr++;
 }
 LcdWriteData(DHT11Data[0]+'0');
 LcdWriteData(DHT11Data[1]+'0');
 LcdWriteData('/');
 LcdWriteData(GlobeHumidity/10+'0');
 LcdWriteData(GlobeHumidity%10+'0');
 LcdWriteData('/');
 LcdWriteData(HumidityLimit/10+'0');
 LcdWriteData(HumidityLimit%10+'0');

 LcdSetPosition(0x00); //設(shè)置溫度顯示在中間位置,第1行
 while(*TempStr != '\0'){
  LcdWriteData(*TempStr);
  TempStr++;
 }
 LcdWriteData(DHT11Data[3]+'0');
 LcdWriteData(DHT11Data[4]+'0');
 LcdWriteData('/');
 LcdWriteData(GlobeTemperature/10+'0');
 LcdWriteData(GlobeTemperature%10+'0');
 LcdWriteData('/');
 LcdWriteData(TemperatureLimit/10+'0');
 LcdWriteData(TemperatureLimit%10+'0');
}