#include <Keypad.h>
// Define keypad setup
const byte ROW_NUM = 4;  // four rows
const byte COL_NUM = 4;  // four columns
char keys[ROW_NUM][COL_NUM] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
byte pin_rows[ROW_NUM] = {9, 8, 7, 6};  // Connect to row pins of the keypad
byte pin_column[COL_NUM] = {5, 4, 3, 2};  // Connect to column pins of the keypad

Keypad keypad = Keypad(makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COL_NUM);

void setup() {
  // Initialize the LED pin as an output
  pinMode(2, OUTPUT);
  digitalWrite(2, LOW);  // Ensure LED is off initially
  pinMode(3, OUTPUT);
  digitalWrite(3, LOW);
  pinMode(4, OUTPUT);
  digitalWrite(4, LOW);
  pinMode(5, OUTPUT);
  digitalWrite(5, LOW);
  pinMode(6, OUTPUT);
  digitalWrite(6, LOW);
  pinMode(7, OUTPUT);
  digitalWrite(7, LOW);
  pinMode(8, OUTPUT);
  digitalWrite(8, LOW);
  pinMode(9, OUTPUT);
  digitalWrite(9, LOW);
  pinMode(10, OUTPUT);
  digitalWrite(10, LOW);
  pinMode(11, OUTPUT);
  digitalWrite(11, LOW);
  pinMode(12, OUTPUT);
  digitalWrite(12, LOW);
  pinMode(13, OUTPUT);
  digitalWrite(13, LOW);
  pinMode(14, OUTPUT);
  digitalWrite(14, LOW);
  pinMode(15, OUTPUT);
  digitalWrite(15, LOW);
  pinMode(16, OUTPUT);
  digitalWrite(16, LOW);
  pinMode(17, OUTPUT);
  digitalWrite(17, LOW);
}

void loop() {
  // Read the key pressed
  char key = keypad.getKey();

  // Check if the key '1' is pressed
  if (key == '1') {
    digitalWrite(2, HIGH);  // Turn on the LED when '1' is pressed
  } else {
    digitalWrite(2, LOW);   // Turn off the LED for any other key
  }
   if (key == '2') {
    digitalWrite(3, HIGH);  // Turn on the LED when '2' is pressed
  } else {
    digitalWrite(3, LOW);   // Turn off the LED for any other key
  } if (key == '3') {
    digitalWrite(4, HIGH);  // Turn on the LED when '3' is pressed
  } else {
    digitalWrite(4, LOW);   // Turn off the LED for any other key
  } if (key == '4') {
    digitalWrite(5, HIGH);  // Turn on the LED when '4' is pressed
  } else {
    digitalWrite(5, LOW);   // Turn off the LED for any other key
  } if (key == '5') {
    digitalWrite(6, HIGH);  // Turn on the LED when '5' is pressed
  } else {
    digitalWrite(6, LOW);   // Turn off the LED for any other key
  } if (key == '6') {
    digitalWrite(7, HIGH);  // Turn on the LED when '6' is pressed
  } else {
    digitalWrite(7, LOW);   // Turn off the LED for any other key
  } if (key == '7') {
    digitalWrite(8, HIGH);  // Turn on the LED when '7' is pressed
  } else {
    digitalWrite(8, LOW);   // Turn off the LED for any other key
  } if (key == '8') {
    digitalWrite(9, HIGH);  // Turn on the LED when '8' is pressed
  } else {
    digitalWrite(9, LOW);   // Turn off the LED for any other key
  } if (key == '9') {
    digitalWrite(10, HIGH);  // Turn on the LED when '9' is pressed
  } else {
    digitalWrite(10, LOW);   // Turn off the LED for any other key
  } if (key == '0') {
    digitalWrite(11, HIGH);  // Turn on the LED when '0' is pressed
  } else {
    digitalWrite(11, LOW);   // Turn off the LED for any other key
  } if (key == 'A') {
    digitalWrite(12, HIGH);  // Turn on the LED when 'A' is pressed
  } else {
    digitalWrite(12, LOW);   // Turn off the LED for any other key
  } if (key == 'B') {
    digitalWrite(13, HIGH);  // Turn on the LED when 'B' is pressed
  } else {
    digitalWrite(13, LOW);   // Turn off the LED for any other key
  } if (key == 'C') {
    digitalWrite(14, HIGH);  // Turn on the LED when 'C' is pressed
  } else {
    digitalWrite(14, LOW);   // Turn off the LED for any other key
  } if (key == 'D') {
    digitalWrite(15, HIGH);  // Turn on the LED when 'D' is pressed
  } else {
    digitalWrite(15, LOW);   // Turn off the LED for any other key
  } if (key == '#') {
    digitalWrite(16, HIGH);  // Turn on the LED when '#' is pressed
  } else {
    digitalWrite(16, LOW);   // Turn off the LED for any other key
  } if (key == '*') {
    digitalWrite(17, HIGH);  // Turn on the LED when '*' is pressed
  } else {
    digitalWrite(17, LOW);   // Turn off the LED for any other key
  }
}