#define WINDOW_SIZE 16 

float samples[WINDOW_SIZE]; 
int i=0;
int numErrors = 0;
float upperValue = 26; 
float lowerValue = 24;
float tempAvg = 0;
int Pin=17;

double convertReading(int x)
  {
    float result=0;
    result=12*x+18; //As the input value of the sensor is digital (it means the values can be 1 or 0) the result will be 18 for 0 and 30 for 1.
    return result;
  }
int getSample()
  { 

    int r;  

    float v; 

    r = digitalRead(Pin); //A sensor is supposed to be connected to the Pin

    v = convertReading(r); 

    for(i=WINDOW_SIZE-1;i>0;i--) //Numeration of arrays start in 0 --> size of 16 includes from 0 to 15
        samples[i]=samples[i-1]; //The elements of the array are moved one place to the right to let the next sample in the first position of the array

    if(samples[0]==samples[1])
      {
        samples[0]=v;
        return 0;
      }

    else
      {
        samples[0]=v;
        return 1;
      }
  } 


float computeAverage()
  { 
    float Average=0; //Inicialization of the variable

    for (i=0;i<WINDOW_SIZE;i++)
      Average = Average+samples[i];

    Average = Average/WINDOW_SIZE;

    return Average;
  } 

void setup() 
  {
    Serial.begin(115200);
    pinMode(Pin, INPUT);
  }

void loop()
  { 

    if (getSample() == 1)
      { 

        numErrors++; 

        if(numErrors > 8)
          { 
            Serial.println("Review the data adquisition function "getSample()"!!!!");
            numErrors = 0; //Initialization of the variable when the error is detected (the error should be fixed when message is shown) 
          } 
      } 

    else 
      { 

        tempAvg = computeAverage(); 

        if(tempAvg > upperValue)
          { 
            Serial.println( "Reduce the air conditioning temperature :(" );
          } 

        else 
          { 
            if(tempAvg < lowerValue)
              { 
                Serial.println( "Increase the air conditioning temperature :(" );
              } 
            else 
              { 
                Serial.println( "All right :)" );
              } 
          } 
      } 
  }