USB Keyboard to Ardu

Projects General Guidance
1

I try to connect a USB Keyboard to my Mega but failed yet.

Bevore I had sucsessfully read from a PS2 Keyboard with the PS2Keyboard Lib.
Now I try to make an adapter beetween USB an PS2. I connected the following PINS:
USB PS2 Meaning Mega
1 4 5 V 5 V
2 1 Data 3
3 5 CLK 4
4 3 GND GND

When I read the input using the PS2Keyboard Lib, I get with keyboard.read FF every second, even when I press no button.

I think I got at least the power pins right, because the lights at the keyboards flashed shortly.
So I varied the remaining pins, but no combination yields the expected result.

Do you have any recommendations?
Or is there a better way than using the PS2- Interface?

And I tried a bought Adapter witch didnt work either.

2

Read this

https://www.circuitsathome.com/mcu/how-to-drive-usb-keyboard-from-arduino/

3

The little "USB to PS/2" adapters only work with USB devices that can detect that they are connected to a PS/2 port and change themselves to PS/2 devices. These were common back in the transition period between PS/2 and USB. I would be surprised if recent USB keyboards bothered to support PS/2.

4

Thank you both; I decided to try a USB Host shield instead.

5

You could just use a PS/2 keyboard. I'm pretty sure many people have one just laying around, so you could ask a family member or friend. Otherwise you could just buy one second hand.
Anyway, it's going to be much cheaper than a USB host shield, and just as easy to use, if not easier.

Pieter