N76E003 DHT11

#include "N76E003.h"
#include "Common.h"
#include "Delay.h"
#include "SFR_Macro.h"
#include "Function_define.h"

#define uint unsigned int
#define uchar unsigned  char

uint WtkCount=0;
bit WtkFlag=0;

sbit DATA_PIN=P1^5;


//温湿度定义
uchar ucharFLAG,uchartemp;
uchar shidu_shi,shidu_ge,wendu_shi,wendu_ge=4;
uchar ucharT_data_H,ucharT_data_L,ucharRH_data_H,ucharRH_data_L,ucharcheckdata;
uchar ucharT_data_H_temp,ucharT_data_L_temp,ucharRH_data_H_temp,ucharRH_data_L_temp,ucharcheckdata_temp;
uchar ucharcomdata;
uchar shidu,wendu;

//延时函数
void Delay_us() //1 us延时
{
    nop;
 nop; nop; nop; nop; nop; nop; nop; nop;
}

void Delay_10us() //10 us延时
{
  Delay_us();
  Delay_us();
  Delay_us();
  Delay_us();
  Delay_us();
  Delay_us();
  Delay_us();
  Delay_us();
  Delay_us();
  Delay_us();   
}


//温湿度传感
void COM(void)    // 温湿写入
{     
    uchar i;         
    for(i=0;i<8;i++)    
    {
        ucharFLAG=2; 
        
        DATA_PIN=0;
        DATA_PIN=1;
        
       while((!DATA_PIN)&&ucharFLAG++);
        Delay_10us();
        Delay_10us();
        Delay_10us();
        uchartemp=0;
        if(DATA_PIN)uchartemp=1;
        ucharFLAG=2;
        while((DATA_PIN)&&ucharFLAG++);
        
        DATA_PIN=0;
        DATA_PIN=1;
        
        if(ucharFLAG==1)break;    
        ucharcomdata<<=1;
        ucharcomdata|=uchartemp; 
    }    
}

void DHT11(void)   //温湿传感启动
{
    DATA_PIN=0;         //拉低总线
    Timer0_Delay1ms(19);        //>18MS
    DATA_PIN=1;         //总线拉高，此时已改变IO状态为读
 //   P0DIR &= ~0x01; //重新配置IO口方向
    Delay_10us();
    Delay_10us();                        
    Delay_10us();
    Delay_10us();
    DATA_PIN=1;
    if(!DATA_PIN) //等待传感器拉低总线
    {
        ucharFLAG=2; 
        while((!DATA_PIN)&&ucharFLAG++);
        ucharFLAG=2;
        while((DATA_PIN)&&ucharFLAG++); //传感器开始发送数据
        COM();
        ucharRH_data_H_temp=ucharcomdata;
        COM();
        ucharRH_data_L_temp=ucharcomdata;
        COM();
        ucharT_data_H_temp=ucharcomdata;
        COM();
        ucharT_data_L_temp=ucharcomdata;
        COM();
        ucharcheckdata_temp=ucharcomdata;
        DATA_PIN=1; //接收完成，拉高总线
        uchartemp=(ucharT_data_H_temp+ucharT_data_L_temp+ucharRH_data_H_temp+ucharRH_data_L_temp);
        if(uchartemp==ucharcheckdata_temp)
        {
            ucharRH_data_H=ucharRH_data_H_temp;
            ucharRH_data_L=ucharRH_data_L_temp;
            ucharT_data_H=ucharT_data_H_temp;
            ucharT_data_L=ucharT_data_L_temp;
            ucharcheckdata=ucharcheckdata_temp;
        }
        //只使用了高八位数据（整数），低八位数据为小数
        wendu_shi=ucharT_data_H/10;
        wendu_ge=ucharT_data_H%10;
        
        shidu_shi=ucharRH_data_H/10; 
        shidu_ge=ucharRH_data_H%10;        
    } 
}


void main (void)
{
	Set_All_GPIO_Quasi_Mode;
	LED=1;
	 while(1)
   {   
         DHT11();  
			wendu=(wendu_shi*10)+wendu_ge;
			shidu=(shidu_shi*10)+shidu_ge;		 
   }
}

DHT11精度真的不高，只适合在一些要求不严的地方使用。