#include <Keypad.h>

const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns
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}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {5, 4, 3, 2}; //connect to the column pinouts of the keypad

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

const int ledPins[] = {10, 11, 12, 13}; // LED pins

void setup() {
  Serial.begin(9600);
  for (int i = 0; i < 4; i++) {
    pinMode(ledPins[i], OUTPUT);
    digitalWrite(ledPins[i], LOW); // Make sure all LEDs are initially off
  }
}

void loop() {
  char key = keypad.getKey();
  if (key != NO_KEY) {
    Serial.println(key);
    if (key >= '0' && key <= '3') {
      int ledIndex = key - '0';
      digitalWrite(ledPins[ledIndex], HIGH);
      delay(1000); // Keep the LED on for 1 second
      digitalWrite(ledPins[ledIndex], LOW);
    }
  }
}