Welcome to the world, Button

Button.cpp

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+/*
+	Button - a small library for Arduino to handle button debouncing
+	
+	MIT licensed.
+*/
+
+#include "Button.h"
+#include <Arduino.h>
+
+Button::Button(uint8_t pin)
+:  _pin(pin)
+,  _delay(500)
+,  _state(HIGH)
+,  _ignore_until(0)
+,  _has_changed(false)
+{
+}
+
+void Button::begin()
+{
+	pinMode(_pin, INPUT_PULLUP);
+}
+
+// 
+// public methods
+// 
+
+bool Button::read()
+{
+	// ignore pin changes until after this delay time
+	if (_ignore_until > millis())
+	{
+		// ignore any changes during this period
+	}
+
+	// pin has changed 
+	else if (digitalRead(_pin) != _state)
+	{
+		_ignore_until = millis() + _delay;
+		_state = !_state;
+		_has_changed = true;
+	}
+
+	return _state;
+}
+
+// has the button been toggled from on -> off, or vice versa
+bool Button::toggled()
+{
+	read();
+	return has_changed();
+}
+
+// mostly internal, tells you if a button has changed after calling the read() function
+bool Button::has_changed()
+{
+	if (_has_changed == true)
+	{
+		_has_changed = false;
+		return true;
+	}
+	return false;
+}
+
+// has the button gone from off -> on
+bool Button::pressed()
+{
+	if (read() == PRESSED && has_changed() == true)
+		return true;
+	else
+		return false;
+}
+
+// has the button gone from on -> off
+bool Button::released()
+{
+	if (read() == RELEASED && has_changed() == true)
+		return true;
+	else
+		return false;
+}

Button.h

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+/*
+	Button - a small library for Arduino to handle button debouncing
+	
+	MIT licensed.
+*/
+
+#ifndef Button_h
+#define Button_h
+#include "Arduino.h"
+
+class Button
+{
+	public:
+		Button(uint8_t pin);
+		void begin();
+		bool read();
+		bool toggled();
+		bool pressed();
+		bool released();
+		bool has_changed();
+
+		const static bool PRESSED = LOW;
+		const static bool RELEASED = HIGH;
+
+	private:
+		uint8_t  _pin;
+		uint16_t _delay;
+		bool     _state;
+		bool     _has_changed;
+		uint32_t _ignore_until;
+};
+
+#endif

README.md

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+Button
+======
+
+* Author: Michael Adams (<http://www.michael.net.nz>)
+* Copyright (C) 2016 Michael D K Adams.
+* Released under the MIT license.
+
+Button is a tiny library to make reading buttons very simple. It handles debouncing automatically, and monitoring of state.
+
+Motivation
+----------
+Ahh buttons. Ahh debouncing! Sometimes you really wish you could ignore all the mechanics of debouncing, reading inputs, monitoring state, and just say... `if (button.pressed())` and know that it'll only run once each time you press a button.
+
+Or how about `if (button.released())`, or `button.toggled()`. It is such a simple concept, but in practice you need to set up timers, monitor input puts, set pullups, etc etc. On anything more than the most simple example, that can become quite a headache.
+
+So fed up with all that I figured there had to be a better way. This library is the result.
+
+Features
+--------
+* Super simple API.
+* Handles debouncing.
+* Sets the pin mode automatically.
+* Lets you write code that triggers:
+** based on the pin state (high or low)
+** when a button is pressed
+** when a button is released
+** or when a button changes (i.e. pressing or releasing)
+
+Requirements
+------------
+* An Arduino — http://arduino.cc/
+* A button
+
+Installation
+------------
+Download the ZIP archive (https://github.com/madleech/Button/zipball/master), then open the Arduino IDE and choose Sketch > Include Library > Add .ZIP Library... and select your downloaded file.
+
+You should now see in File > Examples > Button entires for the basic\_usage example.
+
+Code Examples
+-------------
+Here is the 'basic\_usage' example program, included in the download:
+
+    #include <Button.h>
+
+    Button button1(2); // Connect your button between pin 2 and GND
+    Button button2(3); // Connect your button between pin 3 and GND
+    Button button3(4); // Connect your button between pin 4 and GND
+
+    void setup() {
+    	button1.begin();
+    	button2.begin();
+    	button3.begin();
+    	
+    	while (!Serial) { }; // for Leos
+    	Serial.begin(9600);
+    }
+
+    void loop() {
+    	if (button1.pressed())
+    		Serial.println("Button 1 pressed");
+    	
+    	if (button1.released())
+    		Serial.println("Button 2 released");
+    	
+    	if (button1.toggled())
+    		Serial.print(button3.read() == Button::PRESSED ? "Button 3 has been pressed" : "Button 3 has been released");
+    }
+
+Documentation
+-------------
+**Button(int pin)**
+Creates a new Button.
+
+**void begin()**
+Call this in your `setup` method to setup the button. All it does is set the correct pin mode.
+
+**bool pressed()**
+Returns true when _and only when_ the button is pressed. Until the button is released (in the debounced-sense of the word) this function won't return true again. So in effect, it returns true only while you are pressing the button, or to put it another way, it fires on a rising edge.
+
+**bool released()**
+Like `pressed()`, but round the other way. So if you hold down a button, and then release it... that is when it fires.
+
+**bool toggled()**
+Returns true whenever the button is pressed or released, i.e., its position is toggled. To find out what the position actually is, you can use the `read()` function.
+
+**bool read()**
+Returns the current debounced state of the button, i.e. Button::PRESSED or Button::RELEASED.
+
+**bool has_changed()**
+Returns whether the position/state of the button has changed after calling the previous read() function. Unlikely to be used except by Super Gurus.
+
+Quirks and Things to Keep in Mind
+---------------------------------
+**Highs and lows, lows and highs**
+The easiest way to connect a switch on an Arduino is to connect it between an input pin and ground, and use the internal pullup resistor to make sure it doesn't float. This is fine and dandy, but it can get a bit confusing, as a "pressed" button is logic level: low, while a "released" button is logic level: high.
+
+So to make it a bit more obvious what you're talking about, you can use a couple of handy shortcuts: `Button::PRESSED` and `Button::RELEASED` which map to the expected values.
+
+License
+-------
+Copyright (c) 2016 Michael D K Adams. http://www.michael.net.nz/
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+

examples/basic_usage/basic_usage.ino

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+#include <Button.h>
+
+Button button1(2); // Connect your button between pin 2 and GND
+Button button2(3); // Connect your button between pin 3 and GND
+Button button3(4); // Connect your button between pin 4 and GND
+
+void setup() {
+	button1.begin();
+	button2.begin();
+	button3.begin();
+
+	while (!Serial) { }; // for Leos
+	Serial.begin(9600);
+}
+
+void loop() {
+	if (button1.pressed())
+		Serial.println("Button 1 pressed");
+
+	if (button2.released())
+		Serial.println("Button 2 released");
+
+	if (button3.toggled()) {
+		if (button3.read() == Button::PRESSED)
+			Serial.println("Button 3 has been pressed");
+		else
+			Serial.println("Button 3 has been released");
+	}
+}

keywords.txt

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+#######################################
+# Syntax Coloring Map for Debounce library
+#######################################
+
+#######################################
+# Datatypes (KEYWORD1)
+#######################################
+
+Button       KEYWORD1
+
+#######################################
+# Methods and Functions (KEYWORD2)
+#######################################
+
+read         KEYWORD2
+toggled      KEYWORD2
+pressed      KEYWORD2
+released     KEYWORD2
+has_changed  KEYWORD2
+
+#######################################
+# Constants (LITERAL1)
+#######################################
+PRESSED      LITERAL1
+RELEASED     LITERAL1

library.properties

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+name=Button
+version=1.0.0
+author=Michael Adams <[email protected]>
+maintainer=Michael Adams <[email protected]>
+sentence=Button is a tiny library to make reading buttons very simple.
+paragraph=It handles debouncing automatically, and monitoring of state.
+category=Signal Input/Output
+url=http://utrainia.com/
+architectures=*