Arduino Nano - Button Count - LCD
This tutorial instructs you how to use Arduino Nano to count the button's press and display the value on LCD display. It is possible to adapt this for alternative sensors, rather than just the button.
In this tutorial, we will be debouncing the button without using the delay() function. For further information on why debouncing is necessary, please refer to Why do we need debouncing?.
Hardware Preparation
Or you can buy the following sensor kits:
| 1 | × | DIYables Sensor Kit (30 sensors/displays) | |
| 1 | × | DIYables Sensor Kit (18 sensors/displays) |
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Wiring Diagram
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Arduino Nano Code - displaying button count on LCD I2C
/*
* This Arduino Nano code was developed by newbiely.com
*
* This Arduino Nano code is made available for public use without any restriction
*
* For comprehensive instructions and wiring diagrams, please visit:
* https://newbiely.com/tutorials/arduino-nano/arduino-nano-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(4); // create ezButton object for pin D4
unsigned long prev_count = 0;
void setup() {
Serial.begin(9600);
lcd.init(); // Initialize the LCD I2C display
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 (prev_count != 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);
prev_count != count;
}
}
Detailed Instructions
- Click to the Libraries icon on the left bar of the Arduino IDE.
- Search for “ezButton” and locate the button library by ArduinoGetStarted.
- Press the Install button to install the ezButton library.
- Search for “LiquidCrystal I2C” and then locate the LiquidCrystal_I2C library created by Frank de Brabander.
- Click the Install button to install the LiquidCrystal_I2C library.
- Copy the code and open it in the Arduino IDE.
- Hit the Upload button to transfer it to the Arduino Nano.
- Press the button a few times.
- Check out the count changing on the LCD.
※ NOTE THAT:
The I2C address of LCD can differ depending on the manufacturer. In the code, we have used 0x27 which is specified by DIYables manufacturer.