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DHT11

已有 733 次閱讀2017-10-22 14:19

#include<reg52.h>
#include "intrins.h"
#define uchar unsigned char
#define uint unsigned int
typedef enum keystate{initstate,affrimstate,singlestate,repeastate};
typedef enum ledstate{D0,D1,D2,D3,D4,D5,D6,D7};
sbit RS=P2^6;
sbit RW=P2^5;
sbit EN=P2^7;
sbit DQ=P3^7;
sbit DHT= P1^1 ;//DHT11
sbit key1=P3^0;

uint tempval;//溫度值
uchar n;   //正負標志
uchar   flag;
uchar U8temp;
uchar   U8T_data_H,U8T_data_L,U8RH_data_H,U8RH_data_L,U8checkdata;
uchar   U8T_data_H_temp,U8T_data_L_temp,U8RH_data_H_temp,U8RH_data_L_temp,U8checkdata_temp;
uchar   U8comdata;
uchar DHTData1,DHTData2;
uchar   data str[6]={0,0,0,0,0,0};
uchar data temp_data1[2]={0,0};
uchar data1[3];
uchar data dis_buf[8]={0,0,0,0,0,0,0,0};
uchar code ditab[16]=
{0x00,0x01,0x01,0x02,0x03,0x03,0x04,0x04,0x05,0x06,0x06,0x07,0x08,0x08,0x09,0x09};
uchar temp;
uchar table1[]={"溫度"};
uchar table[]={"."};
uchar table2[]={"C"};
uchar table3[]={":"};
uchar table6[]={"溫度: "};
uchar table7[]={"濕度："};
uchar table8[]={"%"};
uchar table9[]={"DHT11   顯示"};
uchar keynum;
void keyprocess();
//溫度傳感器程序
void delay_us(uint i)
{
   while(i--);
}
void ds1820rst()      //ds1820復位
{ uchar x=0;
DQ = 1;          //DQ復位
delay_us(4);
DQ = 0;          //DQ拉低
delay_us(100);
DQ = 1;          //拉高
delay_us(40);
   }

uchar ds1820read()//18b20讀數據
{ uchar i=0;
uchar dat = 0;
for (i=8;i>0;i--)
{   DQ = 0; //給脈沖信號
     dat>>=1;
     DQ = 1; //給脈沖信號
     if(DQ)
     dat|=0x80;
     delay_us(10);
}
    return(dat);
}
void ds1820write(uchar wdat)//寫數據
{uchar i=0;
    for (i=8; i>0; i--)
   { DQ = 0;
     DQ = wdat&0x01;
     delay_us(10);
     DQ = 1;
     wdat>>=1;
   }
}
void read_temp()             //讀取溫度值并轉換
{
ds1820rst();        //復位
ds1820write(0xcc);    //跳過讀序列號
ds1820write(0xbe);    //讀取溫度
    temp_data1[0]=ds1820read();    //高位
    temp_data1[1]=ds1820read();    //低位
ds1820rst();          //復位
ds1820write(0xcc);    //跳過讀序列號
ds1820write(0x44);    //啟動溫度轉換
}
void ds1820display()                     //溫度值顯示
{

if(temp_data1[1]>127)                        // 溫度值正負判斷
{temp_data1[1]=(255-temp_data1[1]);temp_data1[0]=(255-temp_data1[0]);n=1;}    // 負溫度求補碼
dis_buf[0]=temp_data1[0]&0x0f;         // 取小數部分的值
dis_buf[1]=ditab[dis_buf[0]]+0x30;       // 存入小數部分顯示值
dis_buf[2]=((temp_data1[0]&0xf0)>>4)|((temp_data1[1]&0x0f)<<4);             // 取中間八位,即整數部分的值
dis_buf[3]=dis_buf[2]/100+0x30;          // 取百位數據暫存
dis_buf[4]=dis_buf[2]%100/10+0x30;     // 取十位數據暫存
dis_buf[5]=dis_buf[2]%100%10+0x30;

if(dis_buf[3]==0x30)
{ dis_buf[3]=0x20;            //最高位為0時不顯示百位

      if(dis_buf[4]==0x30)
       {
    dis_buf[4]=0x20;       //十位為0時不顯示十位
    }
   }
if( dis_buf[3]==0)      //符號位位0，則顯示“-”
{
     n=0x2d;
}
else
   {
     n=0x20;
   }
}

void delay(uint t)
{
uchar i,j;
for(i=t;i>0;i--)
for(j=0;j<120;j++);
}

void busy()
{
P0=0xff;
delay(5);
RS=0;
RW=1;
EN=1;
while(P0&0x80);
delay(5);
EN=0;
}
void lcdwritecommand(uchar cmd)
{
busy();
delay(5);
RS=0;
RW=0;
EN=0;
P0=cmd;
EN=1;
delay(5);
   EN=0;
}
void lcdwritedata(uchar dat)
{
busy();
delay(20);
RS=1;
RW=0;
EN=0;
P0=dat;
EN=1;
delay(5);
   EN=0;
}
void pos(uchar *p)
{
while(*p!='\0')
{
   lcdwritedata(*p);
   p++;
   delay(5);
}
}
void lcdinit()
{
keyprocess();
lcdwritecommand(0x30);
delay(5);
lcdwritecommand(0x01);
delay(5);
lcdwritecommand(0x0c);
delay(5);
}

void Delay_10us(void)
      {
        uchar i;
        i--;
        i--;
        i--;
        i--;
        i--;
        i--;
       }

void COM(void)
{

         uchar i;

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

         flag=2;
    while((!DHT)&&flag++);
   Delay_10us();
      Delay_10us();
   Delay_10us();
     U8temp=0;
      if(DHT)U8temp=1;
      flag=2;
   while((DHT)&&flag++);
    //超時則跳出for循環
    if(flag==1)break;
    //判斷數據位是0還是1

  // 如果高電平高過預定0高電平值則數據位為 1

     U8comdata<<=1;
        U8comdata|=U8temp;        //0
      }//rof

}
void RH(void)
{
   //主機拉低18ms
       DHT=0;
    delay(180);
    DHT=1;
//總線由上拉電阻拉高主機延時20us
    Delay_10us();
    Delay_10us();
    Delay_10us();
    Delay_10us();
//主機設為輸入判斷從機響應信號
    DHT=1;
//判斷從機是否有低電平響應信號如不響應則跳出，響應則向下運行
    if(!DHT)   //T !
    {
    flag=2;
//判斷從機是否發出 80us 的低電平響應信號是否結束
    while((!DHT)&&flag++);
    flag=2;
//判斷從機是否發出 80us 的高電平，如發出則進入數據接收狀態
    while((DHT)&&flag++);
//數據接收狀態
    COM();
    U8RH_data_H_temp=U8comdata;
    COM();
    U8RH_data_L_temp=U8comdata;
    COM();
    U8T_data_H_temp=U8comdata;
    COM();
    U8T_data_L_temp=U8comdata;
    COM();
    U8checkdata_temp=U8comdata;
    DHT=1;
//數據校驗

    U8temp=(U8T_data_H_temp+U8T_data_L_temp+U8RH_data_H_temp+U8RH_data_L_temp);
    if(U8temp==U8checkdata_temp)
    {
       U8RH_data_H=U8RH_data_H_temp;
       U8RH_data_L=U8RH_data_L_temp;
    str[1]=(U8RH_data_H|U8RH_data_L)%100/10+0x30;//濕度十位
    str[2]=(U8RH_data_H|U8RH_data_L)%100%10+0x30; //濕度個位

    U8T_data_H=U8T_data_H_temp;
       U8T_data_L=U8T_data_L_temp;
    str[4]=(U8T_data_H|U8T_data_L)%100/10+0x30;
    str[5]=(U8T_data_H|U8T_data_L)%100%10+0x30;

    U8checkdata=U8checkdata_temp;
    }
    }

}

/**************按鍵函數*******************/
void timer0(void)
{
TMOD=0X01;
TH0=0XDC;
TL0=0X00;
TR0=1;
}
uchar keyscan(void)
{
static uchar keystatevalue=0;
static uchar presstime=0;
uchar num;
uchar key_value;
key_value=key1;
switch(keystatevalue)
{
  case initstate:
   if(key_value==0)
   {
    keystatevalue=affrimstate;
   }
   else
   {
   keystatevalue=initstate;
   }
    break;
  case affrimstate:
   if(key_value==0)
   {
    keystatevalue=singlestate;
   }
   else
   {
    keystatevalue=affrimstate;
   }
    break;
  case singlestate:
   presstime++;
   if(presstime>100)
   {
    presstime=0;
    keystatevalue=repeastate;
   }
   else if(key_value==1)
   {
    keystatevalue=initstate;
    num++;
    if(num==8)
    {
     num=0;
    }
   }
    break;
  case repeastate:
   if(key_value==1)
   {
    keystatevalue=initstate;
   }
   presstime++;
   if(presstime>10)
   {
   presstime=0;
    num++;
    if(num==8)
    {
     num=0;
    }
   }
   break;
  default:keystatevalue=initstate; break;
}
return num;
}

/*******DS18B20溫度的顯示*******/
void ds18b20xianshi()
{

  lcdinit();
  ds1820rst();
  ds1820write(0xcc);//跳過讀序列號
  ds1820write(0x44);//啟動溫度轉換
  read_temp();   //讀取溫度
  while(1)
  {
  read_temp();   //讀取溫度
  ds1820display();
  delay(200);
  lcdwritecommand(0x80);
  pos(table1);
  pos(table3);
  lcdwritedata(dis_buf[3]);
  lcdwritedata(dis_buf[4]);
  lcdwritedata(dis_buf[5]);
  pos(table);
  lcdwritedata(dis_buf[1]);
  pos(table2);
  }
}
void dht11xianshi()
{
/*******DHT11的顯示*******/

  lcdinit();
  while(keynum!=3)
  {
RH();
  lcdwritecommand(0x88);
  pos(table6);
  lcdwritedata(str[4]);
  lcdwritedata(str[5]);
  pos(table2);
  lcdwritecommand(0x90);
   pos(table9);
  lcdwritecommand(0x98);
  pos(table7);
  lcdwritedata(str[1]);
  lcdwritedata(str[2]);
  pos(table8);
  }
}
void keyprocess(void)
{

if(TF0==1)
{
  TF0=0;
  TH0=0XDC;
  TL0=0X00;
  keynum=keyscan();
}
switch(keynum)
{
case D0: P1=0xfe;break;
   case D1: P1=0xfd;break;
   case D2: ds18b20xianshi();break;
   case D3: dht11xianshi();break;
   case D4: P1=0xef;break;
case D5: P1=0xdf;break;
   case D6: P1=0xbf;break;
   case D7: P1=0x7f;break;
default: P1=0xff;break;
}