Proteus simulation 4x4 Matrix Keypad with Arduino and LCD screen

 

/*

  Matrix Keypad with LCD Display Demo

  keypad-demo-lcd.ino

  Demonstrates use of 4x4 matrix membrane keypad with Arduino

  Results on LCD Display

  Display uses I2C backpack

  DroneBot Workshop 2020

  https://dronebotworkshop.com

*/

// Include Arduino Wire library for I2C

#include <Wire.h> 

// Include LCD display library for I2C

#include <LiquidCrystal_I2C.h>

// Include Keypad library

#include <Keypad.h>

// Constants for row and column sizes

const byte ROWS = 4;

const byte COLS = 4;

// Array to represent keys on keypad

char hexaKeys[ROWS][COLS] = {

  {'1', '2', '3', 'A'},

  {'4', '5', '6', 'B'},

  {'7', '8', '9', 'C'},

  {'*', '0', '#', 'D'}

};

// Connections to Arduino

byte rowPins[ROWS] = {9, 8, 7, 6};

byte colPins[COLS] = {5, 4, 3, 2};

// Create keypad object

Keypad customKeypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);

// Create LCD object

LiquidCrystal_I2C lcd(0x20, 16, 2);  // use I2c_scanner to find the actual address of the I2c Module

void setup(){

  // Setup LCD with backlight and initialize

  lcd.backlight();

  //lcd.init(); 

 lcd.begin();

}

void loop(){

  // Get key value if pressed

  char customKey = customKeypad.getKey();

  

  if (customKey){

    // Clear LCD display and print character

    lcd.clear();

    lcd.setCursor(0, 0); 

    lcd.print(customKey);

  }

}