#include <Keypad.h>
Standard Proteus versions include a basic generic keypad, but custom libraries provide several benefits: Proteus 4x4 Keypad Library Download
Navigate to your Proteus installation directory—usually found in #include <Keypad
The following section describes how to connect the keypad to an Arduino Uno in Proteus and the necessary code structure. Proteus 4x4 Keypad Library Download