Arduino multiple Button
This tutorial teaches you how to program an Arduino to make use multiple buttons simultaneously without using the delay() function. The tutorial provides code in two ways:
- Arduino multiple buttons with debounce
- Arduino multiple buttons with debounce using arrays.
We will use five buttons as examples. You can easily modify it to adapt for two buttons, four buttons, or even more.
Hardware Required
Or you can buy the following kits:
| 1 | × | DIYables STEM V3 Starter Kit (Arduino included) | |
| 1 | × | DIYables Sensor Kit (18 sensors/displays) |
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Additionally, some links direct to products from our own brand, DIYables .
Wiring Diagram
This image is created using Fritzing. Click to enlarge image
Arduino Code - Multiple Buttons with debounce
When using multiple buttons, things can get complicated in certain scenarios:
- Applications requiring button debouncing (see why we need to debounce for buttons)
- Applications needing to detect state changes (pressed/released)
Thankfully, the ezButton library streamlines this process by internally managing debounce and button events. This relieves users from the task of managing timestamps and variables when utilizing the library. Additionally, employing an array of buttons can enhance code clarity and brevity.
/*
* Created by ArduinoGetStarted.com
*
* This example code is in the public domain
*
* Tutorial page: https://arduinogetstarted.com/tutorials/arduino-multiple-button
*/
#include <ezButton.h>
#define BUTTON_NUM 5 // the number of buttons
#define BUTTON_PIN_1 2 // The Arduino pin connected to the button 1
#define BUTTON_PIN_2 3 // The Arduino pin connected to the button 2
#define BUTTON_PIN_3 4 // The Arduino pin connected to the button 3
#define BUTTON_PIN_4 5 // The Arduino pin connected to the button 4
#define BUTTON_PIN_5 6 // The Arduino 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");
}
Quick Steps
- Do the wiring as above image.
- Connect the Arduino board to your PC via a USB cable
- Open Arduino IDE on your PC.
- Select the right Arduino board (e.g. Arduino Uno) and COM port.
- Click 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.
- Copy the above code and paste it to Arduino IDE.
- Compile and upload code to Arduino board by clicking Upload button on Arduino IDE
- Open Serial Monitor on Arduino IDE
- Press and release the button one by one
8
Serial.println("Hello World!");
Message (Enter to send message to 'Arduino Uno' 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
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