library definition

Using Arduino Programming Questions
5

In this example, all I wanted to do was to print "Test" if TESTING was defined on either the PDE or in a header file in the same folder as the PDE file:

#ifdef TESTING
	Serial.println("Test");
#endif

I tried what you recommended and my code turned out to be:

byte r;
#define TESTING
#include "TestClass.h"

TestClass  t;

void setup()
{
  Serial.begin(57600);
  Serial.println("Start");
  t.TestFunction();
  Serial.println("End");
}

void loop()
{
}

But it still does not run what's indide the ifdef :frowning: