How to setup Keypad 4×4 with Arduino

In this tutorial, you will learn how to interface keypad 4×4 with Arduino. Don’t worry its easy, just follow the steps below.

Before getting started, watch this video first to understand about working and interfacing keypad with arduino.

Arduino Keypad Tutorial

4×4 Keypad Pinout and Connections

Keypad Library for Arduino

Download Keypad Library for Arduino

Keypad Arduino Code

Download Keypad Arduino Code

Note : You need to install the above attached keypad library for Arduino.

#include <Keypad.h>

const byte ROWS = 4; //four rows

const byte COLS = 4; //three columns

char keys[ROWS][COLS] = {

  {'1','2','3','A'},

  {'4','5','6','B' },

  {'7','8','9','C'},

  {'*','0','#','D'}

};

byte rowPins[ROWS] = {5, 4, 3, 2}; //connect to the row pinouts of the keypad

byte colPins[COLS] = {9, 8, 7, 6}; //connect to the column pinouts of the keypad

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

void setup(){
  Serial.begin(9600);
}

void loop(){
  char key = keypad.getKey();
  if (key != NO_KEY){
    Serial.println(key);
  }
}

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