Other Arduino Codes and Videos by Robojax

Arduino code 4x4 Keypad

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This is the Arduino code for 4x4 keypad.

This video shows you how to use 4x4 keypad for arduino.

Related Code and Videos

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3-4x4 Keypad
4-4x4 Keypad Black (hard shell)
5-5x4 Keypad
6-4x3 Keypad: Controlling 8 Channel Relay

Resources for this code

  1. Library code for 4x4 Keypad
  2. Get Schematic diagram for this sketch from Arduino Course on Udemy
  3. Learn Arduino step by step from beginner to Advance (Coruse)
  4. Get Early Access to my videos via Patreon

 * Original sourse: https://playground.arduino.cc/Code/Keypad
 * This is the Arduino code for 4x4 keypad.
 * watch the video for details and demo http://youtu.be/qIDzzG2LUtg
 *  * 
 * Written by Ahmad Nejrabi for Robojax Video channel www.Robojax.com
 * Date: Dec 18, 2017, in Ajax, Ontario, Canada
 * Permission granted to share this code given that this
 * note is kept with the code.
 * Disclaimer: this code is "AS IS" and for educational purpose only.
 * this code has been downloaded from http://robojax.com/learn/arduino/
/* @file HelloKeypad.pde
|| @version 1.0
|| @author Alexander Brevig
|| @contact alexanderbrevig@gmail.com
|| @description
|| | Demonstrates the simplest use of the matrix Keypad library.
|| #
#include <Keypad.h>

const byte ROWS = 4; //four rows
const byte COLS = 4; //three columns
char keys[ROWS][COLS] = {

byte rowPins[ROWS] = {2, 3, 4, 5}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {6,7,8,9}; //connect to the column pinouts of the keypad

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

void setup(){
void loop(){
  char key = keypad.getKey();
    // just print the pressed key
   if (key){
  // this checkes if 4 is pressed, then do something. Here  we print the text but you can control something.
  if (key =='4'){
    Serial.println("Key 4 is pressed");


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