Keyboard's arrow key

It is easy to handle for more people, but not for my sons.
because my keyboard is Happy Hacking Keyboard.
If my son need to press 'K_UP', he need to press [Fn] + [[]
So, the joystick control is good enough for them. If you don't have any idea to control your robot. Pleas support Joystick ( Thank you !!)

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Thank you for your suggest.