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I have created an Arduino Library for a device, of which it can be generally configured in several ways. E.g. use interrupts or poll it. From other examples I have created the following files: foo.h, fooConfig.h and foo.cpp shown below for the library. Where fooConfig.h contains the configuration of how to use the shield. Such as with or without interrupts etc... In doing so I would like the main sketch's INO file to be able to over-ride default settings, which have been declared using #define's. Including in the library's instance. The results show it really does. At least the way I am doing it. The below code is a simplified example with the problem: definetest.ino #define BAR USE_POLL #include <foo.h> foo test; void setup() { Serial.begin(115200); delay(1000); Serial.print(F("setup's defined BAR was ")); Serial.println(BAR); Serial.print(F("inside foo.begin defined BAR was ")); Serial.println(test.begin()); } void loop() { } foo.h #ifndef FOO_h #define FOO_h #include "FOOConfig.h" class foo { public: int begin(); }; #endif // FOO_h FooConfig.h #ifndef FOOCONFIG_h #define FOOCONFIG_h #define USE_INT 1 #define USE_POLL 2 #ifndef BAR //default to using interrupts #define BAR USE_INT #endif // BAR #endif // FOOCONFIG_h foo.cpp #include <foo.h> int foo::begin() { #if defined(BAR) && BAR == USE_INT Timer1.attachInterrupt( isr ); // error here, because of the define... return 1; #elif defined(BAR) && BAR == USE_POLL return 2; #endif return 0; } Yields the following serial output: setup's defined BAR was 2 inside foo.begin defined BAR was 1 Where it was desired to have the BAR inside the foo.begin equal to 2, not 1. N

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