Arduino UNO R4 multiple Button
This guide shows you how to use an Arduino UNO R4 with multiple buttons at the same time without the delay() function to debounce. The guide offers code in two different methods:
- Arduino UNO R4 code debounces multiple buttons without using delay() function.
- Arduino UNO R4 code debounces multiple buttons using arrays without using delay() function .
We will use five buttons as examples. You can change this easily for two buttons, four buttons, or even more.
Hardware Preparation
Or you can buy the following kits:
| 1 | × | DIYables STEM V4 IoT Starter Kit (Arduino included) | |
| 1 | × | DIYables Sensor Kit (18 sensors/displays) |
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Additionally, some of these links are for products from our own brand, DIYables .
Wiring Diagram
This image is created using Fritzing. Click to enlarge image
See The best way to supply power to the Arduino Uno R4 and other components.
Arduino UNO R4 Code - Multiple Buttons with debounce
When using several buttons, situations can become complex.
- Applications that need button debouncing
- Applications that must identify when buttons are pressed or released
The ezButton library simplifies working with buttons by handling debounce and button events internally. Users do not need to worry about managing timestamps and variables when using this library. Also, using multiple buttons can make the code clearer and shorter.
/*
* This Arduino UNO R4 code was developed by newbiely.com
*
* This Arduino UNO R4 code is made available for public use without any restriction
*
* For comprehensive instructions and wiring diagrams, please visit:
* https://newbiely.com/tutorials/arduino-uno-r4/arduino-uno-r4-multiple-button
*/
#include <ezButton.h>
#define BUTTON_NUM 5 // the number of buttons
#define BUTTON_PIN_1 2 // The Arduino UNO R4 pin connected to the button 1
#define BUTTON_PIN_2 3 // The Arduino UNO R4 pin connected to the button 2
#define BUTTON_PIN_3 4 // The Arduino UNO R4 pin connected to the button 3
#define BUTTON_PIN_4 5 // The Arduino UNO R4 pin connected to the button 4
#define BUTTON_PIN_5 6 // The Arduino UNO R4 pin connected to the button 5
ezButton button1(BUTTON_PIN_1); // create ezButton object for button 1
ezButton button2(BUTTON_PIN_2); // create ezButton object for button 2
ezButton button3(BUTTON_PIN_3); // create ezButton object for button 3
ezButton button4(BUTTON_PIN_4); // create ezButton object for button 4
ezButton button5(BUTTON_PIN_5); // create ezButton object for button 5
void setup() {
Serial.begin(9600);
button1.setDebounceTime(100); // set debounce time to 100 milliseconds
button2.setDebounceTime(100); // set debounce time to 100 milliseconds
button3.setDebounceTime(100); // set debounce time to 100 milliseconds
button4.setDebounceTime(100); // set debounce time to 100 milliseconds
button5.setDebounceTime(100); // set debounce time to 100 milliseconds
}
void loop() {
button1.loop(); // MUST call the loop() function first
button2.loop(); // MUST call the loop() function first
button3.loop(); // MUST call the loop() function first
button4.loop(); // MUST call the loop() function first
button5.loop(); // MUST call the loop() function first
// get button state after debounce
int button1_state = button1.getState(); // the state after debounce
int button2_state = button2.getState(); // the state after debounce
int button3_state = button3.getState(); // the state after debounce
int button4_state = button4.getState(); // the state after debounce
int button5_state = button5.getState(); // the state after debounce
/*
Serial.print("The button 1 state: ");
Serial.println(button1_state);
Serial.print("The button 2 state: ");
Serial.println(button2_state);
Serial.print("The button 3 state: ");
Serial.println(button3_state);
Serial.print("The button 4 state: ");
Serial.println(button4_state);
Serial.print("The button 5 state: ");
Serial.println(button5_state);
*/
if (button1.isPressed())
Serial.println("The button 1 is pressed");
if (button1.isReleased())
Serial.println("The button 1 is released");
if (button2.isPressed())
Serial.println("The button 2 is pressed");
if (button2.isReleased())
Serial.println("The button 2 is released");
if (button3.isPressed())
Serial.println("The button 3 is pressed");
if (button3.isReleased())
Serial.println("The button 3 is released");
if (button4.isPressed())
Serial.println("The button 4 is pressed");
if (button4.isReleased())
Serial.println("The button 4 is released");
if (button5.isPressed())
Serial.println("The button 5 is pressed");
if (button5.isReleased())
Serial.println("The button 5 is released");
}
Detailed Instructions
Follow these instructions step by step:
- If this is your first time using the Arduino Uno R4 WiFi/Minima, refer to the tutorial on setting up the environment for Arduino Uno R4 WiFi/Minima in the Arduino IDE.
- Connect the Arduino Uno R4 to the buttons according to the provided diagram.
- Connect the Arduino Uno R4 board to your computer using a USB cable.
- Launch the Arduino IDE on your computer.
- Select the appropriate Arduino Uno R4 board (e.g., Arduino Uno R4 WiFi) and COM port.
- Click on the Libraries icon on the left side of the Arduino IDE.
- Search for ezButton and locate the button library created by ArduinoGetStarted.com.
- Click on the Install button to install the ezButton library.
- Copy the code and paste it into Arduino IDE.
- Click the Upload button in Arduino IDE to compile and upload the code to the Arduino UNO R4 board.
- Open the Serial Monitor in the Arduino IDE.
- Press and release each button one at a resource time.
8
Serial.println("Hello World!");
Message (Enter to send message to 'Arduino Uno R4 WiFi' on 'COM15')
New Line
9600 baud
The button 1 is pressed
The button 1 is released
The button 2 is pressed
The button 2 is released
The button 3 is pressed
The button 3 is released
The button 4 is pressed
The button 4 is released
The button 5 is pressed
The button 5 is released