Use This Adapter to Connect a Retro Keyboard to Your Modern Computer | by Cameron Coward | Medium
PS2Keyboard Library, Connect a keyboard for user input
Turn your ProMicro into a USB Keyboard/Mouse - SparkFun Electronics
Virtual Keyboard Pro Micro USB ATMEGA32U4 AU 5V 16MHz MINI Development Board I2C Module For Arduino Leonardo R3|module for arduino|module i2cmodule 5v - AliExpress
USB HID
Turning An Arduino Into A USB Keyboard | Hackaday
USB Pedal HID Keyboard With Arduino Leonardo : 9 Steps - Instructables
Converting an Old Military Keyboard Into a Modern USB Version with an Arduino - Hackster.io
Pro Micro Beetle Keyboard BadUSB USB ATMEGA32U4 Mini Development Expansion Board Module for Arduino for Leonardo R3 16Mhz: Amazon.com: Industrial & Scientific
Overview | USB NeXT Keyboard with an Arduino Micro | Adafruit Learning System
An USB keyboard for Media Players using Arduino Leonardo - jpralves.net
Connect Arduino UNO to USB Keyboard - Arduino Project Hub
TF MicroSD Micro SD Card Slot Badusb USB Virtual Keyboard ATMEGA32U4 Module for Arduino Leonardo R3 Bad USB CJMCU: Amazon.com: Industrial & Scientific
Arduino-USB-HID-RetroJoystickAdapter/README.md at master · mcgurk/Arduino- USB-HID-RetroJoystickAdapter · GitHub
CJMCU-32 Virtual Keyboard Badusb For Arduino Leonardo USB ATMEGA32U4 | Alexnld.com
Arduino AVR C++: Simple USB HID multimedia keyboard based upon standard keyboard class - Stack Overflow
Using Arduino as Keylogger - Arduino Stack Exchange
Turn your ProMicro into a USB Keyboard/Mouse - SparkFun Electronics