#include <Keypad.h>


#define BZ1 5  


const byte ROWS = 4;    
const byte COLS = 4;   
char keys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};


byte rowPins[ROWS] = {9, 8, 7, 6};   
byte colPins[COLS] = {13, 12, 11, 10}; 


Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

void setup() {
 
  pinMode(BZ1, OUTPUT);
}

void loop() {
  char key = keypad.getKey();  

  if (key) {  
    tone(BZ1, 1000);  
    delay(100);       
    noTone(BZ1);      
  }
}