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Amazon.com: SunFounder FruitKey USB Keyboard DIY Starter Kit Gamepad Control Handle DIY Computer Keyboard, Worked with PC Mac OS X Raspberry Pi for Arduino Uno R3 Leonardo : Electronics
Keyboard and Mouse Control | Arduino Documentation
Arduino - Keypad - Relay | Arduino Tutorial
Arduino UNO with Keypad Interface
Keypad Interfacing with Arduino 4x4, 4x3 with LCD connection and code