main_sht.c

盛世瑞恩公司SHT90温湿度传感器 测量温湿度的源代码 C语言 51单片机

/*****************************************************************************************************
* file name: main_sht.c
* file func: to get humidity and temperature from the sht_sensor
* file description:
* file author:  qcx
* file time:  2009/4/30
* version:   v1.1
*****************************************************************************************************/
#include "sht_demo.h"
//------------------------------------------------------------------------------------------------------
void main()
//------------------------------------------------------------------------------------------------------
//sample program that shows how to use SHT** sensor to measure humidity/temperature
//1.connection reset
//2.measure humidity and temperature
//3.calculate humidity and temperature
//4.calculate dew_point
//5.print temperature , humidity , dew point
{
    value humi_val,temp_val;
    float dew_point;
    unsigned char error,checksum;
    unsigned int i;

    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
//       M_succeed_led = 0;
       if(error	!= 0)  s_connectionreset;
       
       else
       {
          m_succeed_led = 0;
          humi_val.f=(float)humi_val.i;   //convert integer to float
          temp_val.f=(float)temp_val.i;
          calc_sth(&humi_val.f,&temp_val.f); //calculate humidity and temperature
          dew_point=calc_dewpoint(humi_val.f,temp_val.f);  // calculate dewpoint
   //       printf("temp:%5.1fC  humi:%5.1f  %% dewpoint:%5.1fC\n",temp_val.f,humi_val.f,dew_point);
       }
       //---------------------wait approximiatelly 0.8s to avoid heating up sensor--------------------
       for(i=0;i<4000;i++) ;
       //------------------------------------------------------------------------------------------------
     }
}