#include <Keypad.h>

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] = {5, 4, 3, 2}; 

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
const int ledPins[3] = {10, 11, 12};

void setup() {
 
  for (int i = 0; i < 3; i++) {
    pinMode(ledPins[i], OUTPUT);
    digitalWrite(ledPins[i], LOW); 
  }
}

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

  if (key) {
    switch (key) {
      case '7':
    
        for (int i = 2; i >= 0; i--) {
          digitalWrite(ledPins[i], HIGH);
          delay(100); 
        }
        break;
      case '8':
        
        for (int i = 0; i < 3; i++) {
          digitalWrite(ledPins[i], HIGH);
          delay(100); 
        }
        break;
      case 'C':
       
        for (int i = 0; i < 3; i++) {
          digitalWrite(ledPins[i], LOW);
        }
        break;
      default:
        int value = key - '0'; 
        for (int i = 0; i < 3; i++) {
          digitalWrite(ledPins[i], (value >> i) & 1);
        }
        break;
    }
  }
}