papadimos

#include "DHT.h"

#define DHTPIN 2


//#define DHTTYPE DHT11   // DHT 11
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
//#define DHTTYPE DHT21   // DHT 21 (AM2301)

DHT dht(DHTPIN, DHTTYPE);
int TimeToMeasure(int intIncrements);
float GetMeasurement(boolean blnIsFirstMeasurement=false);

boolean blnIsFirstMeasure=false;
unsigned long ulFirstMeasurementPreviewMillis=0;
unsigned long ulMeasurementPreviewMillis=0;
float flMeasurements[10];
int intNumberOfSamples=10;
byte btNowMeasure=0;
float flAverage=-200;

void setup() {
  Serial.begin(9600);
  Serial.println(F("DHTxx test!"));

  dht.begin();

  GetMeasurement(true);
}

void loop() {

   float flAVR=0;

   flAVR=GetMeasurement();
   if(flAVR!=float(-200))
     {
        Serial.println(flAVR);
     }
}


float GetMeasurement(boolean blnIsFirstMeasurement=false)
{

   unsigned long ulTime=millis()-ulMeasurementPreviewMillis;
   byte btCount=-1;
   float flSum=0;
   boolean blnGiveTheMeasure=false;

   if(blnIsFirstMeasurement==true)
     {
        ulFirstMeasurementPreviewMillis=0;
        blnIsFirstMeasure=true;
     }


   if (blnIsFirstMeasure==true)
      {
         if(millis()>2000)
           {
              blnIsFirstMeasure=false;
           }
      }
      else
      {
           if(ulTime<0){ulMeasurementPreviewMillis=millis();}
           if(ulTime>=TimeToMeasure(intNumberOfSamples))
             {
               btNowMeasure++;
               flMeasurements[btNowMeasure-1]=dht.readTemperature();
               if (isnan(flMeasurements[btNowMeasure-1]))
                  {
                    do
                    {
                      flMeasurements[btNowMeasure-1]=dht.readTemperature();
                    }while(isnan(flMeasurements[btNowMeasure-1]==false));
                  }
               if(btNowMeasure==byte(intNumberOfSamples))
                 {
                    ulMeasurementPreviewMillis=millis();

                    for(btCount=0;btCount<byte(intNumberOfSamples);btCount++)
                       {
                          flSum=flSum+flMeasurements[btCount];
                          flAverage=flSum/intNumberOfSamples;
                       }
                    btNowMeasure=0;
                    btCount=0;
                 }
             ulMeasurementPreviewMillis=millis();
             }
      }
      if(flAverage!=-200 && btCount==0){}else{flAverage=-200;}
      return flAverage;
}

int TimeToMeasure(int intIncrements)
{
  int intTime=0;

  if(intIncrements==10){intTime=6000;}
  if(intIncrements==9){intTime=6666;}
  if(intIncrements==8){intTime=7500;}
  if(intIncrements==7){intTime=8571;}
  if(intIncrements==6){intTime=10000;}

  return intTime;
}