Yuji Notsu
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)
Diff: main.cpp
- Revision:
- 0:a2b87ea0684b
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Tue Sep 28 15:24:36 2010 +0000
@@ -0,0 +1,47 @@
+#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;
+ }
+}