Arduino - How to detect button press event?

How to detect if a button is pressed and released using Arduino?

Answer

There are two ways to detect the button press event or release event:

Let's see one by one.

The below wiring diagram will be used for both ways.

Arduino Button Wiring Diagram

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Detecting the button press by using library

#include <ezButton.h> ezButton button(7); // create ezButton object that attach to pin 7; void setup() { Serial.begin(9600); button.setDebounceTime(50); // set debounce time to 50 milliseconds } void loop() { button.loop(); // MUST call the loop() function first if(button.isPressed()) Serial.println("The button is pressed"); if(button.isReleased()) Serial.println("The button is released"); }

※ NOTE THAT:

Detecting the button press by detecting the state's changes

#define BUTTON_PIN 7 int lastButtonState; void setup() { Serial.begin(9600); pinMode(BUTTON_PIN, INPUT_PULLUP); // enable the internal pull-up resistor lastButtonState = digitalRead(BUTTON_PIN); } void loop() { // read the value of the button int buttonState = digitalRead(BUTTON_PIN); if (lastButtonState != buttonState) { // state changed delay(50); // debounce time if (buttonState == LOW) Serial.println("The button pressed event"); else Serial.println("The button released event"); lastButtonState = buttonState; } }

※ NOTE THAT:

⇒ Using the button library is the simplest way.

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