Arduino Nano - Multiple Button

This tutorial instructs you how to program an Arduino Nano so that it can handle multiple buttons at the same time without relying on the delay() function. The tutorial offers code in two different ways:

We will use foir buttons as examples. You can easily modify it to adapt for two buttons, three buttons, five buttons, or even more.

Hardware Preparation

1×Arduino Nano
1×USB A to Mini-B USB cable
1×PCB-mount Button
1×Panel-mount Button
1×Breadboard
1×Jumper Wires
1×(Optional) 9V Power Adapter for Arduino Nano
1×(Recommended) Screw Terminal Adapter for Arduino Nano

Or you can buy the following sensor kit:

1×DIYables Sensor Kit 30 types, 69 units
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Overview of Button

If you are unfamiliar with button (pinout, how it works, how to program ...), the following tutorials can provide you with more information:

Wiring Diagram

The wiring diagram between Arduino Nano and multiple button

This image is created using Fritzing. Click to enlarge image

Arduino Nano Code - Multiple Buttons with debounce

When using multiple buttons, things can get complicated in certain scenarios:

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.

/* * 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-multiple-button */ #include <ezButton.h> #define BUTTON_PIN_1 4 // The Arduino Nano pin connected to the button 1 #define BUTTON_PIN_2 5 // The Arduino Nano pin connected to the button 2 #define BUTTON_PIN_3 6 // The Arduino Nano pin connected to the button 3 #define BUTTON_PIN_4 7 // The Arduino Nano pin connected to the button 4 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 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 } 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 // 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 /* 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); */ 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"); }

Detailed Instructions

  • Do the wiring as above image.
  • Connect the Arduino Nano board to your PC via a USB cable
  • Open Arduino IDE on your PC.
  • Select the right Arduino Nano board (e.g. Arduino Nano 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 Arduino NanoGetStarted
  • Click Install button to install ezButton library.
Arduino Nano button library
  • Copy the above code and paste it to Arduino IDE.
  • Compile and upload code to Arduino Nano board by clicking Upload button on Arduino IDE
How to upload Arduino Nano code on Arduino IDE
  • Open Serial Monitor on Arduino IDE
  • Press and release the button one by one
COM6
Send
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
Autoscroll Show timestamp
Clear output
9600 baud  
Newline  

Arduino Nano Code - Multiple Buttons using array

We can improve the code above by employing an array of buttons. The following code utilizes this array to handle button objects.

/* * 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-multiple-button */ #include <ezButton.h> #define BUTTON_NUM 4 // the number of buttons #define BUTTON_PIN_1 4 // The Arduino Nano pin connected to the button 1 #define BUTTON_PIN_2 5 // The Arduino Nano pin connected to the button 2 #define BUTTON_PIN_3 6 // The Arduino Nano pin connected to the button 3 #define BUTTON_PIN_4 7 // The Arduino Nano pin connected to the button 4 ezButton buttonArray[] = { ezButton(BUTTON_PIN_1), ezButton(BUTTON_PIN_2), ezButton(BUTTON_PIN_3), ezButton(BUTTON_PIN_4) }; void setup() { Serial.begin(9600); for (byte i = 0; i < BUTTON_NUM; i++) { buttonArray[i].setDebounceTime(100); // set debounce time to 100 milliseconds } } void loop() { for (byte i = 0; i < BUTTON_NUM; i++) buttonArray[i].loop(); // MUST call the loop() function first for (byte i = 0; i < BUTTON_NUM; i++) { // get button state after debounce int button_state = buttonArray[i].getState(); // the state after debounce /* Serial.print("The button "); Serial.print(i + 1); Serial.print(": "); Serial.println(button_state); */ if (buttonArray[i].isPressed()) { Serial.print("The button "); Serial.print(i + 1); Serial.println(" is pressed"); } if (buttonArray[i].isReleased()) { Serial.print("The button "); Serial.print(i + 1); Serial.println(" is released"); } } }

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