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標題: 51單片機與DHT11傳感器 [打印本頁]

作者: pengp 時間: 2018-6-2 12:35
標題: 51單片機與DHT11傳感器
#include <reg52.h>
#include "1602.h"
#include "dht.h"

//定義標識
volatile bit FlagStartRH = 0;  //開始溫濕度轉換標志

//定義溫濕度傳感器用外部變量
extern U8  U8FLAG,k;
extern U8  U8count,U8temp;
extern U8  U8T_data_H,U8T_data_L,U8RH_data_H,U8RH_data_L,U8checkdata;
extern U8  U8T_data_H_temp,U8T_data_L_temp,U8RH_data_H_temp,U8RH_data_L_temp,U8checkdata_temp;
extern U8  U8comdata;
extern U8  count, count_r;

U16 temp;
S16 temperature, humidity;
//定義變量
U16 RHCounter;

//定時器0初始化
void Timer0_Init()
{
ET0 = 1;       //允許定時器0中斷
TMOD = 1;    //定時器工作方式選擇
TL0 = 0x06;
TH0 = 0xf8;    //定時器賦予初值
TR0 = 1;       //啟動定時器
}

//定時器0中斷
void Timer0_ISR (void) interrupt 1 using 0
{
TL0 = 0x06;
TH0 = 0xf8;    //定時器賦予初值

//每2秒鐘啟動一次溫濕度轉換
RHCounter ++;
if (RHCounter >= 1000)
{
   FlagStartRH = 1;
   RHCounter = 0;
}
}

/********************************************************************
* 名稱 : Main()
* 功能 : 主函數(shù)
***********************************************************************/
void main()
{
U16 i, j, testnum;

EA = 0;

Timer0_Init();  //定時器0初始化
EA = 1;

L1602_init();
L1602_string(1,1," Welcome to T&H ");
L1602_string(2,1,"Detection System! ");
//延時
for (i=0;i<1000;i++)
   for (j=0;j<1000;j++)
   {;}
//清屏
L1602_string(1,1,"             ");
L1602_string(2,1,"             ");
L1602_string(1,1,"Temperature: C");
L1602_string(2,1,"Humidity:    %");

while(1)
{
   //溫濕度轉換標志檢查
      if (FlagStartRH == 1)
      {
         TR0 = 0;
         testnum = RH();
         FlagStartRH = 0;
         TR0 = 1;
         //讀出溫濕度，只取整數(shù)部分
         humidity = U8RH_data_H;
         temperature = U8T_data_H;
         //顯示溫濕度
         L1602_int(1,12,temperature);
         L1602_int(2,12,humidity);
      }
}
}

#ifndef _DHT_H_
#define _DHT_H_

#include <reg52.h>

typedef unsigned char  U8;    /* defined for unsigned 8-bits integer variable    無符號8位整型變量  */
typedef signed char  S8;    /* defined for signed 8-bits integer variable       有符號8位整型變量  */
typedef unsigned int U16;    /* defined for unsigned 16-bits integer variable    無符號16位整型變量 */
typedef signed int S16;    /* defined for signed 16-bits integer variable    有符號16位整型變量 */
typedef unsigned long  U32;    /* defined for unsigned 32-bits integer variable    無符號32位整型變量 */
typedef signed long  S32;    /* defined for signed 32-bits integer variable    有符號32位整型變量 */
typedef float       F32;    /* single precision floating point variable (32bits) 單精度浮點數(shù)（32位長度） */
typedef double       F64;    /* double precision floating point variable (64bits) 雙精度浮點數(shù)（64位長度） */

sbit DATA = P1^7;

void Delay1(U16 );
void  Delay_10us(void);
void  COM(void);
U8 RH(void);

#endif

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