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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/mouse emulation device. For example, for Apple UEFI or when used with a hardware KVM switch wich [does not recognize composite HID](https://github.com/pikvm/pikvm/issues/7). You can also use the Arduino HID to emulate the PS/2 keyboard.
Using Arduino HID on non-v0 platforms is useful if you need a simple and primitive keyboard/mouse emulator device. For example when used with a hardware KVM switch which [does not recognize composite HID](https://github.com/pikvm/pikvm/issues/7). You can also use the Arduino HID to emulate the PS/2 keyboard.
## 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).
@ -55,7 +55,7 @@ build_flags =
# -DHID_SET_USB_MOUSE_REL
```
By default, the firmware works with USB HID and supports dynamic mode switching. You can choose one of the other modes by commenting out some lines and uncomenting others. For example, you can use a USB mouse and PS/2 keyboard:
By default, the firmware works with USB HID and supports dynamic mode switching. You can choose one of the other modes by commenting some lines and uncomenting others. This example to use a USB mouse and PS/2 keyboard:
```ini
...
# ----- The default config with dynamic switching -----
@ -74,11 +74,11 @@ By default, the firmware works with USB HID and supports dynamic mode switching.
...
```
Next, you need to connect the Arduino pins to the female PS/2 port of your motherboard. Choose the purple port. If your motherboard only have one port, it's probably universal and can be used either for the keyboard or for the mouse. Most likely, it is painted in two colors: green and purple. You can use it either.
Next, you need to connect Arduino pins to the female PS/2 port of your motherboard. Choose the purple port. If your motherboard only have one port, it's probably universal and can be used either for the keyboard or for the mouse. Most likely, it is painted in two colors: green and purple. You can use it either.
Follow this diagram:
| 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 |
**Connect VIN pin of Arduino to any Raspberry's 5v pin for PS/2 only device. But you don't need to connect the Arduino VIN pin if you connected USB (Arduino will get power through it).**
**Connect VIN pin of Arduino to [any Raspberry's 5v pin](https://pinout.xyz/pinout/5v_power) for PS/2 only device. But you don't need to connect the Arduino VIN pin if you connected USB (Arduino will get power through it).**

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