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Arduino - Button Count - LCD
In this tutorial, we are going to use Arduino:
- Count the number of times a button is pressed
- Display the count number on LCD I2C display.
- Auto vertical and horizontal center align the count number on LCD I2C display.
In this tutorial, the button also is debounced without using delay() function. See Why do we need debouncing?
Hardware Required
Or you can buy the following sensor kits:
| 1 | × | DIYables Sensor Kit (30 sensors/displays) | |
| 1 | × | DIYables Sensor Kit (18 sensors/displays) |
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.
Wiring Diagram
This image is created using Fritzing. Click to enlarge image
Arduino Code - displaying button count on LCD I2C
/*
* Created by ArduinoGetStarted.com
*
* This example code is in the public domain
*
* Tutorial page: https://arduinogetstarted.com/tutorials/arduino-button-count-lcd
*/
#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.
- Search “LiquidCrystal I2C”, then find the LiquidCrystal_I2C library by Frank de Brabander
- Click Install button to install 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
※ NOTE THAT:
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
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