Can Arduino make USB devices? Try using the HID function with Arduino Pro Micro (Leonardo)
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Converting an Old Military Keyboard Into a Modern USB Version with an Arduino - Hackster.io
Pro Micro - 5V/16MHz - DEV-12640 - SparkFun Electronics
Arduino AVR C++: Simple USB HID multimedia keyboard based upon standard keyboard class - Stack Overflow
Turning An Arduino Into A USB Keyboard | Hackaday
Learn More | Trinket USB Keyboard | Adafruit Learning System
USB Pedal HID Keyboard With Arduino Leonardo : 9 Steps - Instructables
CJMCU-32 Virtual Keyboard Badusb For Arduino Leonardo USB ATMEGA32U4 | Alexnld.com
Most universal sequence of keyboard presses to start an editor - Super User
An USB keyboard for Media Players using Arduino Leonardo - jpralves.net
Turn your ProMicro into a USB Keyboard/Mouse - SparkFun Electronics
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Pro Micro Beetle Keyboard BadUSB USB ATMEGA32U4 Mini Development Expansion Board Module for Arduino for Leonardo R3 16Mhz: Amazon.com: Industrial & Scientific
USB to USB keyboard converter build log(Pro Micro 3.3v with mini host shield)
Turn your ProMicro into a USB Keyboard/Mouse - SparkFun Electronics
Use This Adapter to Connect a Retro Keyboard to Your Modern Computer | by Cameron Coward | Medium
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PS2Keyboard Library, Connect a keyboard for user input
Overview | USB NeXT Keyboard with an Arduino Micro | Adafruit Learning System