Yuji Notsu / Mbed 2 deprecated HSM20G_test

Temperature and Humidity measure by HSM20G, and display the information of Temp / RH in TextLCD (16 x 2). The circuit between mbed and HSM20G is recommended circuit. ( http://sites.google.com/site/measuringstuff/more-sensor-examples#TOC-HSM-20G-Humidity-and-Temperature-Mi)

Dependencies:   mbed

main.cpp

Committer:
y_notsu
Date:
2010-09-28
Revision:
0:a2b87ea0684b

File content as of revision 0:a2b87ea0684b:

#include "mbed.h"
#include "TextLCD.h"

int nsum=10;

AnalogIn humidity(p20);
AnalogIn temp(p19);

float sensorValue2 = 0.0;
float sensorValue3 = 0.0; 
 
TextLCD lcd(p24,p25,p26,p27,p28,p29); //rs,e,d0-d3 


int main() {
    while (1){
    for (int i=0;i<nsum;i++)
    {    
     // lcd.cls();
      sensorValue2 += humidity.read();   
     // lcd.locate(0,0);
     // lcd.printf("p20=%5.3f",sensorValue2); 
      sensorValue3 += temp.read();
     // lcd.locate(0,1);
     // lcd.printf("p19=%5.3f",sensorValue3);
     // wait(2.0); 
    }    
    float sensorValue2Avg= sensorValue2/(float)nsum; 
    float RH= 30.855*sensorValue2Avg*3.3-11.504;    
    
    float  sensorValue3Avg= sensorValue3/(float)nsum;
     float Vt=(float) sensorValue3Avg*3.3;  
     float R=(5.0-Vt)*10.0/Vt; 
     float TinC=0.0037*R*R - 0.9876*R + 65.573;
     
     lcd.cls();
     lcd.locate(0,0);
     lcd.printf("RH  =%3.1f[per]",RH);
     lcd.locate(0,1);
     lcd.printf("Temp=%3.1f[deg]",TinC);
     
     wait(2.0);
     
      sensorValue2 = 0.0;
      sensorValue3 = 0.0; 
    }
}