Help with c++ code to add my own built library to project

Troubleshooting
1

In the past I wrote a header file Dewpnt_heatIndx.h and used it in arduino project.

namespace Dewpnt_heatIndx
{
  
// reference: http://en.wikipedia.org/wiki/Dew_point

double dewPointFast(double celsius, double humidity)
{
  double a = 17.271;
  double b = 237.7;
  double temp = (a * celsius) / (b + celsius) + log(humidity * 0.01);
  double Td = (b * temp) / (a - temp);
  return Td;
}

double heatIndex(double tempF, double humidity)
{
  double c1 = -42.38, c2 = 2.049, c3 = 10.14, c4 = -0.2248, c5 = -6.838e-3, c6 = -5.482e-2, c7 = 1.228e-3, c8 = 8.528e-4, c9 = -1.99e-6  ;
  double T = tempF;
  double R = humidity;

  double A = (( c5 * T) + c2) * T + c1;
  double B = ((c7 * T) + c4) * T + c3;
  double C = ((c9 * T) + c8) * T + c6;

  double rv = (C * R + B) * R + A;
  return rv;
}

}

by including like this ::

#include "Dewpnt_heatIndx.h"

and then to use the subroutine in my ino file I called as shown below.

dP = (Dewpnt_heatIndx::dewPointFast(indorTempinC, indoorHumidity));

But today when I was using Builder on particle.io website, as soon as I hit enter after filling name of header file, it created a cpp file.

I have no prior experience of cpp, can anyone help me out with this please

2

If that file isn’t needed, you should be able to remove it without issues. Or leave it empty :slight_smile:

1 Like
3

thanks for your help, I figured out from this link: https://msdn.microsoft.com/en-us/library/ms235627.aspx