Turn your ProMicro into a USB Keyboard/Mouse - SparkFun Electronics
Code | Trinket USB Keyboard | Adafruit Learning System
Connect a USB Keyboard with an Arduino - Hackster.io
H. Stamm-Wilbrandt on Twitter: ""Re: How to connect #USB #keyboard to #ESP32?" It works, via #Arduino #Due #USBHost adapter and library: https://t.co/IdcwJxEKpV https://t.co/7G5uv7ptqn" / Twitter
USB Host - Keyboard to ASCII Converter
Arduino to USB Keyboard - Project Guidance - Arduino Forum
USB Pedal HID Keyboard With Arduino Leonardo : 9 Steps - Instructables
USB Key logger - Share Project - PCBWay
Arduino AVR C++: Simple USB HID multimedia keyboard based upon standard keyboard class - Stack Overflow