#include <Keypad.h>

const uint8_t ROWS = 4;
const uint8_t COLS = 4;
char keys[ROWS][COLS] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};

uint8_t colPins[COLS] = { A0, A1, A2, A3 }; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = {2, 3, 4, 5}; // Pins connected to R1, R2, R3, R4

// Define LED pins
const int ledPins[] = {10, 11, 12,1}; // Assuming LEDs are connected to pins 6, 7, 8, 9

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

void setup() {
 

  // Set LED pins as outputs
  for (int i = 0; i < 4; i++) {
    pinMode(ledPins[i], OUTPUT);
    digitalWrite(ledPins[i], LOW); // Turn off LEDs initially
  }
}

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

  if (key != NO_KEY) {
   
    // Map keys to LEDs
    switch (key) {
      case '1':
        digitalWrite(ledPins[0], HIGH);
        break;
      case '2':
        digitalWrite(ledPins[1], HIGH);
        break;
      case '3':
        digitalWrite(ledPins[2], HIGH);
        break;
      case '4':
        digitalWrite(ledPins[0], HIGH);
        break;
      case '5':
        digitalWrite(ledPins[3], HIGH);
        break;
      case '6':
        digitalWrite(ledPins[1], HIGH);
        break;
      case '7':
        digitalWrite(ledPins[2], HIGH);
        break;      
      case '8':
        digitalWrite(ledPins[0], HIGH);
        break;
      case '9':
        digitalWrite(ledPins[3], HIGH);
        break;
      case '0':
        digitalWrite(ledPins[1], HIGH);
        break;
      case '*':
        digitalWrite(ledPins[2], HIGH);
        break;  
      case '#':
        digitalWrite(ledPins[3], HIGH);
        break;
      case 'A':
        digitalWrite(ledPins[0], HIGH);
        break;
      case 'B':
        digitalWrite(ledPins[1], HIGH);
        break;
      case 'C':
        digitalWrite(ledPins[2], HIGH);
        break;
      case 'D':
        digitalWrite(ledPins[3], HIGH);
        break;
    }
     delay(500);
   
    for (int i = 0; i < 4; i++) {
      digitalWrite(ledPins[i], LOW);
    }
  }
}