Arduino - Button Count - LCD

In this tutorial, we are going to use Arduino:

In this tutorial, the button also is debounced without using delay() function. See Why do we need debouncing?

Hardware Required

1×Arduino UNO or Genuino UNO
1×USB 2.0 cable type A/B
1×Push Button
1×(Optional) Panel-mount Push Button
1×Jumper Wires
1×(Optional) 9V Power Adapter for Arduino
1×(Recommended) Screw Terminal Block Shield for Arduino Uno
1×(Optional) Transparent Acrylic Enclosure For Arduino Uno

Or you can buy the following sensor kit:

1×DIYables Sensor Kit 30 types, 69 units
Please note: These are Amazon affiliate links. If you buy the components through these links, We will get a commission at no extra cost to you. We appreciate it.

About LCD I2C and Button

If you do not know about LCD I2C and button (pinout, how it works, how to program ...), learn about them in the following tutorials:

Wiring Diagram

Arduino Button LCD I2C Wiring Diagram

This image is created using Fritzing. Click to enlarge image

Arduino Code - displaying button count on LCD I2C

/* * Created by * * This example code is in the public domain * * Tutorial page: */ #include <LiquidCrystal_I2C.h> #include <ezButton.h> LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27 (from DIYables LCD), 16 column and 2 rows ezButton button(13); // create ezButton object that attach to pin 13; unsigned long lastCount = 0; void setup() { Serial.begin(9600); lcd.init(); // initialize the lcd lcd.backlight(); // open the backlight button.setDebounceTime(50); // set debounce time to 50 milliseconds button.setCountMode(COUNT_FALLING); } void loop() { button.loop(); // MUST call the loop() function first unsigned long count = button.getCount(); if (lastCount != count) { Serial.println(count); // print count to Serial Monitor lcd.clear(); lcd.setCursor(0, 0); // start to print at the first row lcd.print("Count: "); lcd.print(count); lastCount != count; } }

Quick Steps

  • Navigate to the Libraries icon on the left bar of the Arduino IDE.
  • Search “ezButton”, then find the button library by ArduinoGetStarted
  • Click Install button to install ezButton library.
Arduino button library
  • Search “LiquidCrystal I2C”, then find the LiquidCrystal_I2C library by Frank de Brabander
  • Click Install button to install LiquidCrystal_I2C library.
Arduino LiquidCrystal I2C library
  • Copy the above code and open with Arduino IDE
  • Click Upload button on Arduino IDE to upload code to Arduino
  • Press button several times
  • See the counting number changed on LCD


The I2C address of LCD can vary according to the manufacturers. In the code, we used 0x27 that is specified by DIYables manufacturer

Video Tutorial

We are considering to make the video tutorials. If you think the video tutorials are essential, please subscribe to our YouTube channel to give us motivation for making the videos.

The Best Arduino Starter Kit