Arduino Leonardo Keyboard library problems

[potatoprogrammer]

Hello.

I recently purchased a cheap Leonardo and I'm trying to use the Keyboard.h library to emulate a keyboard. I am using a nordic keyboard layout (Finnish) and ran into some problems because the arduino only sends keystrokes using US layout.

I have been able to connect every other symbol (either through the Keyboard.cpp file or with the help of the .ino file) correctly except for these < > |
These are typed using one button (different combinations: shift and Alt gr). Can I even access this button through the arduino or am I trying to do something impossible?

Any help would be much appreciated!

[er_name_not_found]

Did you try filtering it on the output side.

If (symbol == '>');
    symbol = '(Finnish symbol)';

[potatoprogrammer]

This is what I did for symbols that used alt gr as the library doesn't support adding altgr into the Keyboard.cpp file. However I have not found a symbol on the Finnish keyboard that would correspond to the '<' symbol on the US keyboard.

[er_name_not_found]

I see that those are all on one key on a Finnish keyboard, at least the one I'm looking at.
I fact, it looks like an extra key between the shift and the Z.
That's a pickle.

[potatoprogrammer]

Yes correct, they are all on one key. I am beginning to think that there is no corresponding key to the '<' key.

[er_name_not_found]

Can you get the raw codes from the KB?

[potatoprogrammer]

I have tried that. I think that the problem is that the US keyboard doesn't have a key where the < key is on the Finnish keyboard.

[er_name_not_found]

Try this:
GitHub - Necr0tizing/ArduinoKeyboardLayouts: Arduino keyboard languages for easy swapping of keyboard layout codes to match your language, ideal for non US users

[potatoprogrammer]

Will try this once I get home. Thanks!

[er_name_not_found]

Absolutely
Hope it helps
Please post your results to help future users too.

[sterretje]

@potatoprogrammer, your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with your project See About the Installation & Troubleshooting category.

[potatoprogrammer]

Worked! Or partially at least. You still need to define all characters that require the altgr key in the .ino file, but knowing the hexadecimal for '<' made it possible to add all symbols to the keyboard.

Here is how I defined the altgr characters to the code. You can probably get the idea without the whole code.

 if(b.length() == 1 && b[0] == '$')
  {
    Keyboard.press(KEY_RIGHT_ALT);
    Keyboard.press('4');
    Keyboard.releaseAll();
  }
  else if(b.length() == 1 && b[0] == '@')
  {
    Keyboard.press(KEY_RIGHT_ALT);
    Keyboard.press('2');
    Keyboard.releaseAll();
  }
  else if(b.length() == 1 && b[0] == '{')
  {
    Keyboard.press(KEY_RIGHT_ALT);
    Keyboard.press('7');
    Keyboard.releaseAll();
  }
  else if(b.length() == 1 && b[0] == '[')
  {
    Keyboard.press(KEY_RIGHT_ALT);
    Keyboard.press('8');
    Keyboard.releaseAll();
  }
  else if(b.length() == 1 && b[0] == ']')
  {
    Keyboard.press(KEY_RIGHT_ALT);
    Keyboard.press('9');
    Keyboard.releaseAll();
  }
  else if(b.length() == 1 && b[0] == '}')
  {
    Keyboard.press(KEY_RIGHT_ALT);
    Keyboard.press('0');
    Keyboard.releaseAll();
  }
  else if(b.length() == 1 && b[0] == '\\')
  {
    Keyboard.press(KEY_RIGHT_ALT);
    Keyboard.press('+');
    Keyboard.releaseAll();
  }
  else if(b.length() == 1 && b[0] == '|')
  {
    Keyboard.press(KEY_RIGHT_ALT);
    Keyboard.press('<');
    Keyboard.releaseAll();
  }

[er_name_not_found]

Awesome.
Glad you got it figured out.
I found that solution by searching "arduino finnish keyboard.h"
Hope that helps with future language barriers.

Happy programming!

[potatoprogrammer]

I had been only searching with "keyboard.cpp". Need to remember to use the package name xd

[potatoprogrammer]

Created a better alternative to the Keyboard.cpp file.

Can be found here: GitHub - nuuttihenriksson/Keyboard

Hopefully helps someone.

[er_name_not_found]

What did you improve?

[potatoprogrammer]

Added the possibility to use the "alt gr" key in the ascii map. It is used at least with nordic keyboards to reach certain characters such as € $ and @.

[er_name_not_found]

Excellent