DHT11温湿度传感器AT89S52/STC89C52RC编程与调试

//****************************************************************//
//    DHT21使用范例 
//单片机 AT89S52 或 STC89C52RC 
//功能   串口发送温湿度数据 晶振 11.0592M 波特率 9600 
//硬件   P2.0口为通讯口连接DHT11,DHT11的电源和地连接单片机的电源和地，单片机串口加MAX232连接电脑 
//公司  雁凌电子    
//****************************************************************//

#include <reg51.h>
#include <intrins.h> 
//
typedef unsigned char  U8;       /* defined for unsigned 8-bits integer variable    无符号8位整型变量  */
typedef signed   char  S8;       /* defined for signed 8-bits integer variable   有符号8位整型变量  */
typedef unsigned int   U16;      /* defined for unsigned 16-bits integer variable    无符号16位整型变量 */
typedef signed   int   S16;      /* defined for signed 16-bits integer variable    有符号16位整型变量 */
typedef unsigned long  U32;      /* defined for unsigned 32-bits integer variable    无符号32位整型变量 */
typedef signed   long  S32;      /* defined for signed 32-bits integer variable    有符号32位整型变量 */
typedef float          F32;      /* single precision floating point variable (32bits) 单精度浮点数（32位长度） */
typedef double         F64;      /* double precision floating point variable (64bits) 双精度浮点数（64位长度） */
//
#define uchar unsigned char
#define uint unsigned int
#define   Data_0_time    4

//----------------------------------------------//
//----------------IO口定义区--------------------//
//----------------------------------------------//
sbit  P2_0  = P2^0 ;

//----------------------------------------------//

//----------------定义区--------------------//
//----------------------------------------------//
U8  U8FLAG,k;
U8  U8count,U8temp;
U8  U8T_data_H,U8T_data_L,U8RH_data_H,U8RH_data_L,U8checkdata;
U8  U8T_data_H_temp,U8T_data_L_temp,U8RH_data_H_temp,U8RH_data_L_temp,U8checkdata_temp;
U8  U8comdata;
U8  outdata[5];  //定义发送的字节数    
U8  indata[5];
U8  count, count_r=0;
U8  str[5]={"RS232"};
U16 U16temp1,U16temp2;
SendData(U8 *a)
{
outdata[0] = a[0]; 
outdata[1] = a[1];
outdata[2] = a[2];
outdata[3] = a[3];
outdata[4] = a[4];
count = 1;
SBUF=outdata[0];
}

       void Delay(U16 j)
    {      U8 i;
    for(;j>0;j--)
  { 
for(i=0;i<27;i++);

  }