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Update arduino_hid.md

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# Hardware Arduino HID instead of the OTG
Using Arduino HID on non-v0 platforms is useful if you need a simple and primitive keyboard emulation device. For example, when used with a hardware KVM switch. You can use the firmware to emulate a USB keyboard and mouse, or for the PS/2 keyboard only.
Using Arduino HID on non-v0 platforms is useful if you need a simple and primitive keyboard emulation device. For example, when used with a hardware KVM switch. You can use the firmware to emulate:
* [USB keyboard & mouse](#usb-keyboard--mouse)
* [PS/2 keyboard only](#ps2-keyboard)
* [PS/2 keyboard & USB mouse](#ps2-keyboard--usb-mouse)
## USB keyboard & mouse
* Build and connect HID according to the [diagram](../README.md#setting-up-the-v0) (the bottom part with transistor, level-shifter and Arduino).
@ -24,7 +27,7 @@ Using Arduino HID on non-v0 platforms is useful if you need a simple and primiti
## PS/2 keyboard
Using the PS/2 firmware currently has the following limitations:
* The possibility of using USB HID is excluded.
* Mouse is not supported due to features of the [PS/2 protocol](https://wiki.osdev.org/PS/2_Mouse).
* PS/2 mouse is not supported due to features of the [PS/2 protocol](https://wiki.osdev.org/PS/2_Mouse).
Both of these problems will be solved one way or another in the future and the two different firmware versions will be combined into one universal one.
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| Female PS/2 port (front view) | Pinout |
|-------------------------------|--------|
| <img src="/img/ps2_kbd.png" alt="drawing" width="200"/> | Arduino pin 7 <-> PS/2 CLOCK<br>Arduino pin 5 <-> PS/2 DATA<br>Arduino GND pin <-> PS/2 GND |
## PS/2 keyboard & USB mouse
This is a mixed mode of HID which is a compromise for old computers. Connections are made simultaneously by both USB and PS/2 pins, as shown in the diagram above. Follow the [PS/2 instructions](#ps2-keyboard), but use these commands to build and install the firmware:
```
# make mixed
# make install
```