Arduino sprintf()Arduino sprintf

This code is about basic example where we interface a 4×4 keypad with Arduino and one 20×4 LCD with Arduino. You can also use 16×2 LCD with Arduino in same code. Here is the complete working code example.

#include <LiquidCrystal.h>
#include <Keypad.h>

const int rs = 7, en = 6, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns
char keys[ROWS][COLS] = {
byte rowPins[ROWS] = {8, 9, 10, 11}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {A0, A1, A2, A3}; //connect to the column pinouts of the keypad

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

void setup(){
  lcd.begin(20, 4); // initialize the LCD with 20x4 characters
  lcd.setCursor(0, 0);
  lcd.print("Press a key:");

void loop(){
  char key = keypad.getKey();
  if (key){
    lcd.setCursor(0, 1);
    lcd.print("Pressed: ");
Code language: Arduino (arduino)

By Abdul Rehman

My name is Abdul Rehman and I love to do Reasearch in Embedded Systems, Artificial Intelligence, Computer Vision and Engineering related fields. With 10+ years of experience in Research and Development field in Embedded systems I touched lot of technologies including Web development, and Mobile Application development. Now with the help of Social Presence, I like to share my knowledge and to document everything I learned and still learning.

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