#include <Bounce2.h>
Bounce b = Bounce(); // Instantiate a Bounce object

b.attach ( <PIN> , <PIN MODE> );
b.interval( <INTERVAL IN MS> );

b.update();
if ( b.changed() ) { 
  // THE STATE OF THE INPUT CHANGED
  int deboucedValue = b.read();
  // DO SOMETHING WITH THE VALUE
}

// This example toggles the debug LED (pin 13) on or off when a button on pin 2 is pressed.

// Include the Bounce2 library found here :
// https://github.com/thomasfredericks/Bounce2
#include <Bounce2.h>

#define BUTTON_PIN 2
#define LED_PIN 13

int ledState = LOW;


Bounce b = Bounce(); // Instantiate a Bounce object

void setup() {
  
  b.attach(BUTTON_PIN,INPUT_PULLUP); // Attach the debouncer to a pin with INPUT_PULLUP mode
  b.interval(25); // Use a debounce interval of 25 milliseconds
  
  
  pinMode(LED_PIN,OUTPUT); // Setup the LED
  digitalWrite(LED_PIN,ledState); // Turn off the LED
 
}

void loop() {

   b.update(); // Update the Bounce instance
   
   if ( b.fell() ) {  // Call code if button transitions from HIGH to LOW
     ledState = !ledState; // Toggle LED state
     digitalWrite(LED_PIN,ledState); // Apply new LED state
   }
}

/* 
 DESCRIPTION
 ====================
 This is an example of the Bounce2::Button class. 
 When the user presses a physical button, it toggles a LED on or off.
 The Button class matches an electrical state to a physical action. 
 Use .setPressedState(LOW or HIGH) to set the detection state for when the button is pressed.

 INSTRUCTIONS
 ====================
 Set BUTTON_PIN to the pin attached to the button.
 Set LED_PIN to the pin attached to a LED.
 
 */
 
// Include the Bounce2 library found here :
// https://github.com/thomasfredericks/Bounce2
#include <Bounce2.h>

// INSTANTIATE A Button OBJECT
Bounce2::Button button = Bounce2::Button();

// WE WILL attach() THE BUTTON TO THE FOLLOWING PIN IN setup()
#define BUTTON_PIN 39 

// DEFINE THE PIN FOR THE LED :
// 1) SOME BOARDS HAVE A DEFAULT LED (LED_BUILTIN)
//#define LED_PIN LED_BUILTIN
// 2) OTHERWISE SET YOUR OWN PIN
#define LED_PIN 13

// SET A VARIABLE TO STORE THE LED STATE
bool ledState = LOW;

void setup() {

  // BUTTON SETUP 
  
  // SELECT ONE OF THE FOLLOWING :
  // 1) IF YOUR BUTTON HAS AN INTERNAL PULL-UP
  // button.attach( BUTTON_PIN ,  INPUT_PULLUP ); // USE INTERNAL PULL-UP
  // 2) IF YOUR BUTTON USES AN EXTERNAL PULL-UP
  button.attach( BUTTON_PIN, INPUT ); // USE EXTERNAL PULL-UP

  // DEBOUNCE INTERVAL IN MILLISECONDS
  button.interval(5); 

  // INDICATE THAT THE LOW STATE CORRESPONDS TO PHYSICALLY PRESSING THE BUTTON
  button.setPressedState(LOW); 
  
  // LED SETUP
  pinMode(LED_PIN,OUTPUT);
  digitalWrite(LED_PIN,ledState);

}

void loop() {
  // UPDATE THE BUTTON
  // YOU MUST CALL THIS EVERY LOOP
  button.update();

  if ( button.pressed() ) {
    
    // TOGGLE THE LED STATE : 
    ledState = !ledState; // SET ledState TO THE OPPOSITE OF ledState
    digitalWrite(LED_PIN,ledState);

  }
}