#include <Keypad.h>
//setup keypad
//define row 
const byte Rows = 4;
const byte Cols = 4;
//define keypad layout
char layout[Rows][Cols]={
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};

//connction with arduino
byte rowPins[Rows]={9,8,7,6};
byte colPins[Cols]={5,4,3,2};

//pass config to keypad.h
Keypad keypad_obj = Keypad(makeKeymap(layout),rowPins,colPins,Rows, Cols);


void setup(){
pinMode(13, OUTPUT);
Serial.begin(9600);
}

void loop(){
 Serial.println("input Password: ");

//digitalWrite(13, HIGH);
char key =keypad_obj.getKey();
if(key){
  Serial.println(key);
}
else{
  
}

}