USB to USB keyboard converter build log(Pro Micro 3.3v with mini host shield)
8pcs Push Button Switch 4 Keyboard Module key Board Keypad for Arduino DUE Breadboard Leonardo ZERO Tre Micro banana pi Zigbee|switch program|switch stovekeypad rfid - AliExpress
Pro Micro - 5V/16MHz - DEV-12640 - SparkFun Electronics
Pro Micro Mini SS Beetle Virtual Keyboard BadUSB ATmega32u4 Module For – diymore
Arduino Keyboard Is Gorgeous Inside And Out | Hackaday