bounce_basic.ino

Basic example of the Bounce class.

/*
DESCRIPTION
====================
Simple example of the Bounce library that switches a LED when
a state change (from HIGH to LOW) is triggered (for example when a button is pressed).
Set BOUNCE_PIN to the pin attached to the input (a button for example).
Set LED_PIN to the pin attached to a LED.
*/
// WE WILL attach() THE Bounce INSTANCE TO THE FOLLOWING PIN IN setup()
#define BOUNCE_PIN 2
// 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
// Include the Bounce2 library found here :
// https://github.com/thomasfredericks/Bounce2
#include <Bounce2.h>
// INSTANTIATE A Bounce OBJECT
Bounce bounce = Bounce();
// SET A VARIABLE TO STORE THE LED STATE
int ledState = LOW;
void setup() {
// BOUNCE SETUP
// SELECT ONE OF THE FOLLOWING :
// 1) IF YOUR INPUT HAS AN INTERNAL PULL-UP
bounce.attach( BOUNCE_PIN , INPUT_PULLUP ); // USE INTERNAL PULL-UP
// 2) IF YOUR INPUT USES AN EXTERNAL PULL-UP
//bounce.attach( BOUNCE_PIN, INPUT ); // USE EXTERNAL PULL-UP
// DEBOUNCE INTERVAL IN MILLISECONDS
bounce.interval(5); // interval in ms
// LED SETUP
pinMode(LED_PIN, OUTPUT);
digitalWrite(LED_PIN, ledState);
}
void loop() {
// Update the Bounce instance (YOU MUST DO THIS EVERY LOOP)
bounce.update();
// <Bounce>.changed() RETURNS true IF THE STATE CHANGED (FROM HIGH TO LOW OR LOW TO HIGH)
if ( bounce.changed() ) {
// THE STATE OF THE INPUT CHANGED
// GET THE STATE
int deboucedInput = bounce.read();
// IF THE CHANGED VALUE IS LOW
if ( deboucedInput == LOW ) {
ledState = !ledState; // SET ledState TO THE OPPOSITE OF ledState
digitalWrite(LED_PIN,ledState); // WRITE THE NEW ledState
}
}
}