#include <Keypad.h>

const int led1 = 2;
const int led2 = 3;
const int led3 = 4;
const int buzzer = 5;


const byte ROWS = 4; //samping
const byte COLS = 4; // bawah
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(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(buzzer, OUTPUT);
}

void loop() {
  char key = keypad.getKey(); 
  if (key == '1') {
    digitalWrite(led1, HIGH); 
  } else if (key == '2') {
    digitalWrite(led2, HIGH); 
  } else if (key == '3') {
    digitalWrite(led3, HIGH); 
  }

  
  if (digitalRead(led1) == HIGH && digitalRead(led2) == HIGH && digitalRead(led3) == HIGH) {

    digitalWrite(buzzer, HIGH);
  }
}