How to create USB HID from Arduino?

Question

Arduino

I have an Arduino Mega and wanted to make a usb device that would be easily recognized by a computer. For example, like USB HID - keyboard, mouse, etc.
Where can I find out how to work with USB, how does the computer recognize the device?

Answer 1

To take arduino on Atmega32u4 (leonardo is large, pro micro is compact), it can use iron HID and requires only a couple of initialization lines.
And if you build on atmera32, atmega328 (most arduin) then as in the answer from Alexander v-usb to help.
Upd. First I answered the question of the cap, then I read the clarification. But still let it be

Answer 2

google for "V - USB HID Arduino" here is
one example and about the rules for writing it (in the internet there is documentation and programs for this).