How to Connect a PC Keyboard to an Arduino?

How can we connect a keyboard to an Arduino? Let´s find out. The method shown in the video works best with legacy PS/2 keyboards or USB keyboards that still use the PS/2 protocol.
Unfortunately there are some newer USB keyboards around that no more support the PS/2 protocol. It will NOT function with these.
Sources and schematic: https://www.hackster.io/michalin70/co...

Tools:
Camera: https://amzn.to/3kDp1BJ
USB Oscilloscope: https://amzn.to/3CMC7Tu

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0:00 Introduction
0:40 Description of the PS/2 protocol
1:41 Writing a simple keyboard routine for an Arduino Nano
2:40 PS/2 scancodes
3:50 Example: Typing on a LC display