Pull requests #58 and #60 added support for the Swedish and Danish keyboard layouts. Unlike the previously supported layouts, these new layouts came each with a header file that provides macro definitions for the keys that are not otherwise easily accessible. For example, Keyboard_sv_SE.h defines:

#define KEY_A_RING (136+0x2f)
#define KEY_A_UMLAUT (136+0x34)
#define KEY_O_UMLAUT (136+0x33)
#define KEY_UMLAUT (136+0x30)
#define KEY_ACUTE_ACC (136+0x2e)

This pull request extends this to all the other supported layouts, namely de_DE, es_ES, fr_FR and it_IT. Note that en_US does not require such support, as all its keys are already readily accessible.

With this new definitions, every single key of a full-size PC keyboard can now be reached on every layout, either with Keyboard.write(ASCII_char) or by using one of the provided macros.

Example: the following sketch prints "ça va être drôle!" on a French keyboard:

#include <Keyboard.h>
#include <Keyboard_fr_FR.h>
void setup() {
 Keyboard.begin(KeyboardLayout_fr_FR);
 delay(5000);
 Keyboard.write(KEY_C_CEDILLA);
 Keyboard.print("a va ");
 Keyboard.write(KEY_CIRCUMFLEX);
 Keyboard.print("etre dr");
 Keyboard.write(KEY_CIRCUMFLEX);
 Keyboard.println("ole!");
}
void loop(){}