Code for Led Keypad

 // LED On using Keypad

#include <Keypad.h>

#define ROW_NUM    4  // four rows

#define COLUMN_NUM 4  // four columns

char keys[ROW_NUM][COLUMN_NUM] = {

  {'1', '2', '3', 'A'},

  {'4', '5', '6', 'B'},

  {'7', '8', '9', 'C'},

  {'*', '0', '#', 'D'}

};

byte pin_rows[ROW_NUM] = {13, 12, 11, 10}; //connect to the row pinouts of the keypad

byte pin_column[COLUMN_NUM] = {9, 8, 7, 6};

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

void setup() {

  // put your setup code here, to run once:

    Serial.begin(9600);

    pinMode(0, OUTPUT);

    pinMode(1, OUTPUT);

    pinMode(12, OUTPUT);

    pinMode(13, OUTPUT);

}

void loop() {

  // put your main code here, to run repeatedly:

  char key = keypad.getKey();

 

  if (key) {

    Serial.println(key);

      if(key == '2'){

        digitalWrite(13, HIGH);

      }

      else{

        digitalWrite(13, LOW);

      }

    }

  else{

    Serial.println("Wrong Key pressed.");

    }

}