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   源码介绍

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主控stc89c52RC芯片，读取DHT11温湿度传感器并在LCD1602显示

图示湿度40%，温度25℃

//中断比特率设置为9600

void ConfigTimer0(unsigned int ms)
{
    unsigned long tmp;  
    
    tmp = 11059200 / 12;     
    tmp = (tmp * ms) / 1000; 
    tmp = 65536 - tmp;        
    tmp = tmp   12;          
    T0RH = (unsigned char)(tmp>>8);  
    T0RL = (unsigned char)tmp;
    TMOD &= 0xF0;   
    TMOD |= 0x01;   
    TH0 = T0RH;     
    TL0 = T0RL;
    ET0 = 1;        
    TR0 = 1;        
}

//分别读取DHT11湿度数据的高位和低位数据

void RH(void)
{
	dht11 = 0;
	Delay(180);
	dht11 = 1;
	Delay_10us();
	Delay_10us();
	Delay_10us();
	Delay_10us();
	dht11 = 1;
	if(!dht11)
	{
		U8FLAG = 2;
		while((!dht11) && U8FLAG  );
		U8FLAG = 2;
		while((dht11) && U8FLAG  );
		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;
		dht11 = 1;
		
		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;
		  U8T_data_H=U8T_data_H_temp;
		  U8T_data_L=U8T_data_L_temp;
		  U8checkdata=U8checkdata_temp;
		}
		dht11 = 1;
		
	}
}

//转化为字符串便于在LCD显示（高位部分）

unsigned char IntToStringRH(unsigned char *str, int dat)
{
    signed char i = 0;
    unsigned char len = 3;
    unsigned char buf[9];
    
	*str   = 'R';
	*str   = 'H';
	*str   = ':';
    if (dat < 0)
    {
        dat = -dat;
        *str   = '-';
        len  ;
    }
    do {
        buf[i  ] = dat % 10;
        dat /= 10;
    } while (dat > 0);
    len  = i;
    while (i-- > 0)
    {
        *str   = buf[i]   '0';
    }
    *str = '\0';
    
    return len;
}
//