How to activate a debug function defined in a library from an arduino sketch?

Projects Programming
1

Hi,
This is probably a stupid question, but I couldn’t find a solution.

I would like to activate / deactivate a debug function of a library (basically print some information on the serial interface) from an adruino sketch.

So in the library (let’s say LIB.h) I have defined:

#ifndef LIB_h
#define LIB_h

#ifndef DEBUG
#define DEBUG 0
#endif
….

if (DEBUG) Serial.println (“hello”);
…..

#endif

Now in my sketch I would like to turn the debug mode on staring my sketch with:

#define DEBUG 1
#include <LIB.h>
……..

void setup() {
Serial.begin(9600);
….
}

But this doesn’t work (defining DEBUG 1 or 0 is not recognised by the library).

How can I solve this problem?

Thanks in advance

Robert

2

Make it a variable, not a #define.

Amend the library to use this variable. (You can use extern to pass variables from one module to another).

3

Easy :slight_smile:
Thanks for the tip
Ronert