#include

#include

#include

LiquidCrystal$\_$I$2$C lcd$(0$x$27,16,2)$;

int i$=0$;

const char number$\_$of$\_$rows $=4$;

const char number$\_$of$\_$columns $=4$;

char row$\_$pins$[$number$\_$of$\_$rows$]=\{9,8,7,6\}$;

char column$\_$pins$[$number$\_$of$\_$columns$]=\{5,4,3,2\}$;

char key$\_$array$[$number$\_$of$\_$rows$][$number$\_$of$\_$columns$]=\{$

$\{\text{'}1\text{'},\text{'}2\text{'},\text{'}3\text{'},\text{'}$A$\text{'}\},$

$\{\text{'}4\text{'},\text{'}5\text{'},\text{'}6\text{'},\text{'}$B$\text{'}\},$

$\{\text{'}7\text{'},\text{'}8\text{'},\text{'}9\text{'},\text{'}$C$\text{'}\},$

$\{\text{'}*\text{'},\text{'}0\text{'},\text{'}$#$\text{'},\text{'}$D$\text{'}\}$

$\}$;