//----------------------------------------------------------------------------------
void main()
//----------------------------------------------------------------------------------
// sample program that shows how to use SHT11 functions
// 1. connection reset
// 2. measure humidity [ticks](12 bit) and temperature [ticks](14 bit)
// 3. calculate humidity [%RH] and temperature [°C]
// 4. calculate dew point [°C]
// 5. print temperature, humidity, dew point
{ value humi_val,temp_val;
float dew_point;
unsigned char error,checksum;
unsigned int i;
init_uart();
s_connectionreset();
while(1)
{ error=0;
error+=s_measure((unsigned char*) &humi_val.i,&checksum,HUMI); //measure humidity
error+=s_measure((unsigned char*) &temp_val.i,&checksum,TEMP); //measure temperature
if(error!=0) s_connectionreset(); //in case of an error: connection reset
else
{ humi_val.f=(float)humi_val.i; //converts integer to float
temp_val.f=(float)temp_val.i; //converts integer to float
calc_sth11(&humi_val.f,&temp_val.f); //calculate humidity, temperature
dew_point=calc_dewpoint(humi_val.f,temp_val.f); //calculate dew point
printf("temp:%5.1fC humi:%5.1f%% dew point:%5.1fC\n",temp_val.f,humi_val.f,dew_point);
}
//----------wait approx. 0.8s to avoid heating up SHTxx------------------------------
for (i=0;i<40000;i++); //(be sure that the compiler doesn't eliminate this line!)
//-----------------------------------------------------------------------------------
}
}
int main(int argc, const char *argv[])
{
// SHT11
// 6257 1547 2287 5062
const int16_t raw_temp = 6257;
const int16_t raw_humi = 1547;
{
printf("SHT11 single conversion\n\n");
printf("%6s %6s\n", "Traw", "Hraw");
printf("%6d %6d\n", raw_temp, raw_humi);
float Tcels1 = sht11_temp_convert_sensirion(raw_temp);
float RHtrue1 = sht11_humid_convert_sensirion(Tcels1, raw_humi);
printf("%6.2f %6.2f Host: Sensirion convert mine\n", Tcels1, RHtrue1);
float RHtrue2 = raw_humi;
float Tcels2 = raw_temp;
calc_sth11(&RHtrue2, &Tcels2);
printf("%6.2f %6.2f Host: Sensirion convert datasheet\n", Tcels2, RHtrue2);
printf("%6.2f %6.2f AVR: Highlevel output\n", (float)2287 / 100.f, (float)5062 / 100.f);
}
printf("**************************************************\n\n"
"SHT11 tabular conversion with fixed temperature\n"
"and raw humidity ranging in [0..3500]\n\n");
const float Tcels = sht11_temp_convert_sensirion(raw_temp);
printf("Traw Hraw Tcels Tcels2 RH1 RH2 DP DP2\n");
int16_t SOrh;
float RHtrue, RHtrue2, Tcels2;
float DP;
float DP2;
for (SOrh = 0; SOrh <= 3500; SOrh += 50) {
RHtrue = sht11_humid_convert_sensirion(Tcels, SOrh);
Tcels2 = raw_temp;
RHtrue2 = SOrh;
calc_sth11(&RHtrue2, &Tcels2);
DP = calc_dewpoint(RHtrue2, Tcels2);
DP2 = calc_dewpoint_approx((int) RHtrue2, Tcels2 * 10) / 10.0;
printf("%4hu %4hu %5.2f %5.2f %6.2f %6.2f %6.2f %6.2f\n", raw_temp, SOrh, Tcels, Tcels2, RHtrue, RHtrue2, DP, DP2);
}
return 0;
}
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);
}
}
u16 get_sht11_hanback_data(u8 type)
{
acq_type=type;
error=0;
error+=s_measure(&sht11_humi,&checksum,HUMI); //measure humidity
error+=s_measure(&sht11_temp,&checksum,TEMP); //measure temperature
if(error!=0) s_connectionreset(); //in case of an error: connection reset
else
{
calc_sth11(sht11_humi,sht11_temp); //calculate humidity, temperature
if(acq_type==DEW)dew_point=calc_dewpoint(sht11_humi,sht11_temp); //calculate dew point
//char buf[10];
//puts("sht11_humi="); itoa(sht11_humi,buf,10); puts(buf); puts("\r\n");
//puts("sht11_temp="); itoa(sht11_temp,buf,10); puts(buf); puts("\r\n");
}
if(acq_type == DEW)return (u16)(dew_point*10);
else if(acq_type == HUMI)return myhumi;
else if(acq_type == TEMP)return mytemp;
else return 0;
}
void takeHumiAnfTemperature()
{
unsigned char error,checksum;
//unsigned int i;
//WDTCTL = WDTPW + WDTHOLD;
s_connectionreset();
error=0;
error+=s_measure(&t_temp,&checksum,TEMP);
error+=s_measure(&t_hum,&checksum,HUMI);
if(error!=0) s_connectionreset();
else
{
temperatureSHT11 = (float) t_temp;
hum = (float) t_hum;
calc_sth11(&hum, &temperatureSHT11); //calculate humidity, temperature
dew_point=calc_dewpoint(hum,temperatureSHT11); //calculate dew point
}
//1 second delay
//__delay_cycles (16000000);
}