Bounce2
BOUNCE 2

Debouncing library for Arduino and Wiring by Thomas Ouellet Fredericks with contributions from: Eric Lowry, Jim Schimpf, Tom Harkaway, Joachim Kr├╝ger and MrGradgrind.

More about debouncing: http://en.wikipedia.org/wiki/Debounce#Contact_bounce

See the bottom of this page for a basic usage example and the "examples" folder for more.

GITHUB PAGE

https://github.com/thomasfredericks/Bounce2

DOCUMENTATION

The complete class documentation can be found in the "docs" folder or online here.

HAVE A QUESTION?

Please post your questions here.

INSTALLATION & DOWNLOAD

Install through your software's Library Manager or download the latest version here and put the "Bounce2" folder in your "libraries" folder.

The original version of Bounce (Bounce 1) is included in the download but not supported anymore.

DEBOUNCE ALGORITHMS (FOR ADVANCED USERS)

STABLE INTERVAL

By default, the Bounce library uses a stable interval to process the debouncing. This is simpler to understand and can cancel unwanted noise.

LOCK-OUT INTERVAL

By defining "#define BOUNCE_LOCK_OUT" in "Bounce.h" (or in your code before including "Bounce.h") you can activate an alternative debouncing method. This method is a lot more responsive, but does not cancel noise.

#define BOUNCE_LOCK_OUT

WITH PROMPT DETECTION

By defining "#define BOUNCE_WITH_PROMPT_DETECTION" in "Bounce.h" (or in your code before including "Bounce.h") you can activate an alternative debouncing method. Button state changes are available immediately so long as the previous state has been stable for the timeout period. Otherwise the state will be updated as soon as the timeout period allows.

#define BOUNCE_WITH_PROMPT_DETECTION

BASIC EXAMPLE

// 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 debouncer = Bounce(); // Instantiate a Bounce object
void setup() {
debouncer.attach(BUTTON_PIN,INPUT_PULLUP); // Attach the debouncer to a pin with INPUT_PULLUP mode
debouncer.interval(25); // Use a debounce interval of 25 milliseconds
pinMode(LED_PIN,OUTPUT); // Setup the LED
digitalWrite(LED_PIN,ledState);
}
void loop() {
debouncer.update(); // Update the Bounce instance
if ( debouncer.fell() ) { // Call code if button transitions from HIGH to LOW
ledState = !ledState; // Toggle LED state
digitalWrite(LED_PIN,ledState); // Apply new LED state
}
}