#include <Keypad.h>
char keys [4] [4] = {
{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'}
};
byte rowPins[4]={ 9,8,7,6};
byte columnPins[4]={5,4,3,2};
Keypad keypad= Keypad(makeKeymap(keys),rowPins,columnPins,4,4);
void setup()
{
Serial.begin(9600);
}
void loop()
{
char key=keypad.getKey();
if (key)
{ Serial.print("You Press:");
Serial.println(key);}
}