73 lines
1.8 KiB
Arduino
73 lines
1.8 KiB
Arduino
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/*
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DESCRIPTION
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====================
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Pressing a physical button switches a LED on or off.
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Simple example of the Button class from the Bounce library.
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The Button class matches an electrical state to a physical action
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with <Button>.setPressedState(LOW or HIGH).
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Set BUTTON_PIN to the pin attached to the button.
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Set LED_PIN to the pin attached to a LED.
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*/
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// WE WILL attach() THE BUTTON TO THE FOLLOWING PIN IN setup()
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#define BUTTON_PIN 2
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// DEFINE THE PIN FOR THE LED :
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// 1) SOME BOARDS HAVE A DEFAULT LED (LED_BUILTIN)
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//#define LED_PIN LED_BUILTIN
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// 2) OTHERWISE SET YOUR OWN PIN
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#define LED_PIN 13
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// Include the Bounce2 library found here :
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// https://github.com/thomasfredericks/Bounce2
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#include <Bounce2.h>
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// INSTANTIATE A Button OBJECT
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Button button = Button();
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// SET A VARIABLE TO STORE THE LED STATE
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bool ledState = LOW;
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void setup() {
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// BUTTON SETUP
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// SELECT ONE OF THE FOLLOWING :
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// 1) IF YOUR BUTTON HAS AN INTERNAL PULL-UP
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// button.attach( BUTTON_PIN , INPUT_PULLUP ); // USE INTERNAL PULL-UP
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// 2) IF YOUR BUTTON USES AN EXTERNAL PULL-UP
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button.attach( BUTTON_PIN, INPUT ); // USE EXTERNAL PULL-UP
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// DEBOUNCE INTERVAL IN MILLISECONDS
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button.interval(5);
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// INDICATE THAT THE LOW STATE CORRESPONDS TO PHYSICALLY PRESSING THE BUTTON
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button.setPressedState(LOW);
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// LED SETUP
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pinMode(LED_PIN,OUTPUT);
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digitalWrite(LED_PIN,ledState);
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}
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void loop() {
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// UPDATE THE BUTTON
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// YOU MUST CALL THIS EVERY LOOP
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button.update();
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// <Button>.pressed() RETURNS true IF THE STATE CHANGED
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// AND THE CURRENT STATE MATCHES <Button>.setPressedState(<HIGH or LOW>);
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if ( button.pressed() ) {
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// TOGGLE THE LED STATE :
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ledState = !ledState; // SET ledState TO THE OPPOSITE OF ledState
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digitalWrite(LED_PIN,ledState); // WRITE THE NEW ledState
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}
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}
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