4 Keys RGB Mechanical Keyboard Keypad Module Rainbow LED MAX Key X4 SK6812 RGB Full Color LED Button for Arduino Building Blocks|Home Automation Modules| - AliExpress
Building your own keyboard (from scratch) | by w4ilun | Medium
Building your own keyboard (from scratch) | by w4ilun | Medium
Arduino Keypad Shield with 16-Button Matrix Keypad
First prototype of a DIY mechanical keyboard kit powered by Arduino is a success! : r/MechanicalKeyboards
Mechanical keyboard with a Slide Potentiometer - Project Guidance - Arduino Forum