#define TEMP 0
#define HUMI 1

void calc_sht11(float *p_humidity,float *p_temprature)
{
const float C1=-0.40;//针对于12为测量精度
const float C2=0.0405;
const float C3=-0.0000028;
const float T1=0.01;//相对湿度的温度补偿
const float T2=0.00008;

float rh=*p_humidity;
float t=*p_temprature;
float rh_lin;
float rh_true;
float t_C;

t_C=t*0.01-40;//温度值（14为测量数据精度时）
rh_lin=C3*rh*rh+C2*rh+C1;//临时湿度值
rh_true=(t_C-25)*(T1+T2*rh)+rh_lin;//修正后的湿度值
if(rh_true>100)rh_true=100;
if(rh_true<0.1)rh_true=0.1;

*p_temprature=t_C;
*p_humidity=rh_true;
}

float calc_dewpoint(float h,float t)//空气的露点值
{
float k,dew_point;
k=(log10(h)-2)/0.4343+(17.62*t)/(243.12+t);
dew_point=243.12*k/(17.62-k);
return dew_point;
}

void delay(int time)
{
int i;
for(i=0;ii++;
}

int main(void)
{
int fd,ret,i;
unsigned int value_t=0;
unsigned int value_h=0;
float fvalue_t,fvalue_h;
float dew_point;
fd = open("/dev/sht11",0);

if(fd<0)
{
printf("open /dev/sht11 error!\n");
return -1;
}

for(;;)
{
fvalue_t=0.0,fvalue_h=0.0;value_t=0;value_h=0;
ioctl(fd,0);
ret=read(fd,&value_t,sizeof(value_t));
if(ret<0)
{
printf("read err!\n");
continue;
}
sleep(1);

value_t=value_t&0x3fff;//温度：14位测量数据
//printf("value_t=%d\n",value_t);
fvalue_t=(float)value_t;

ioctl(fd,1);
ret=read(fd,&value_h,sizeof(value_h));
// printf("value_h=%d\n",value_h);
sleep(1);
if(ret<0)
{
printf("read err!\n");
continue;
}
value_h=value_h&0xfff;//湿度：12位测量数据
fvalue_h=(float)value_h;
calc_sht11(&fvalue_h,&fvalue_t);//将输出转换为物理量
dew_point=calc_dewpoint(fvalue_h,fvalue_t);//空气的露点值
printf("temp:%fc humi:%f dew point:%fc\n",fvalue_t,fvalue_h,dew_point);
sleep(1);

}
}
我刚发出来，还在修改中，那位老大就给我投了一票，是不是你哇，谢谢了啊！！！