diff --git a/button.cpp b/button.cpp
index 2957b49..4787e80 100644
--- a/button.cpp
+++ b/button.cpp
@@ -1,11 +1,11 @@
 /*----------------------------------------------------------------------*
- * button.cpp -- Library for reading momentary contact switches like	*
- * tactile button switches.	Intended for use in state machine 			*
- * constructs.  Use the read() function to read all buttons in the 		*
- * main loop, which should execute as fast as possible, or at least		*
- * very frequently.														*
- *																		*
- * Jack Christensen 11May2011											*
+ * Button.cpp -- Library for reading momentary contact switches like    *
+ * tactile button switches. Intended for use in state machine           *
+ * constructs. Use the read() function to read all buttons in the       *
+ * main loop, which should execute as fast as possible, or at least     *
+ * very frequently.                                                     *
+ *                                                                      *
+ * Jack Christensen 11May2011                                           *
  *                                                                      *
  * This work is licensed under the Creative Commons Attribution-        *
  * ShareAlike 3.0 Unported License. To view a copy of this license,     *
@@ -13,7 +13,6 @@
  * letter to Creative Commons, 171 Second Street, Suite 300,            *
  * San Francisco, California, 94105, USA.                               *
  *----------------------------------------------------------------------*/
-#include "WProgram.h"
 #include "button.h"
 
 //the constructor button(pin, puEnabled, invert, dbTime) instantiates a button object.
@@ -25,52 +24,52 @@
 //note that invert cannot be implied from puEnabled since an external pullup could be used.
 button::button(uint8_t pin, uint8_t puEnabled, uint8_t invert, uint32_t dbTime)
 {
-	_pin = pin;
-	_puEnabled = puEnabled;
-	_invert = invert;
-	_dbTime = dbTime;
-	pinMode(_pin, INPUT);
+    _pin = pin;
+    _puEnabled = puEnabled;
+    _invert = invert;
+    _dbTime = dbTime;
+    pinMode(_pin, INPUT);
     if (_puEnabled != 0)
-    	digitalWrite(_pin, HIGH);		//enable pullup resistor
-	_state = digitalRead(_pin);
-	if (_invert != 0) _state = !_state;
-	_time = millis();
-	_lastState = _state;
-	_changed = 0;
-	_lastTime = _time;
-	_lastChange = _time;
+        digitalWrite(_pin, HIGH);       //enable pullup resistor
+    _state = digitalRead(_pin);
+    if (_invert != 0) _state = !_state;
+    _time = millis();
+    _lastState = _state;
+    _changed = 0;
+    _lastTime = _time;
+    _lastChange = _time;
 }
 
 //read() returns the state of the button 1 (pressed), or 0 (released),
 //does debouncing, and also captures and maintains times, previous states, etc.
 uint8_t button::read(void)
 {
-	static uint32_t ms;
-	static uint8_t pinVal;
+    static uint32_t ms;
+    static uint8_t pinVal;
 
-	ms = millis();
-	pinVal = digitalRead(_pin);
-	if (_invert != 0) pinVal = !pinVal;
-	if (ms < _lastChange + _dbTime) {
-		_lastTime = _time;
-		_time = ms;
-		_changed = 0;
-		return _state;
-	}
-	else {
-		_lastTime = _time;
-		_lastState = _state;
-		_state = pinVal;
-		_time = ms;
-		if (_state != _lastState)	{
-			_lastChange = ms;
-			_changed = 1;
-		}
-		else {
-			_changed = 0;
-		}
-		return _state;
-	}
+    ms = millis();
+    pinVal = digitalRead(_pin);
+    if (_invert != 0) pinVal = !pinVal;
+    if (ms < _lastChange + _dbTime) {
+        _lastTime = _time;
+        _time = ms;
+        _changed = 0;
+        return _state;
+    }
+    else {
+        _lastTime = _time;
+        _lastState = _state;
+        _state = pinVal;
+        _time = ms;
+        if (_state != _lastState)   {
+            _lastChange = ms;
+            _changed = 1;
+        }
+        else {
+            _changed = 0;
+        }
+        return _state;
+    }
 }
 
 //isPressed() and isReleased() check the button state when it was last read,
@@ -78,12 +77,12 @@ uint8_t button::read(void)
 //These functions do not cause the button to be read.
 uint8_t button::isPressed(void)
 {
-	return _state == 0 ? 0 : 1;
+    return _state == 0 ? 0 : 1;
 }
 
 uint8_t button::isReleased(void)
 {
-	return _state == 0 ? 1 : 0;
+    return _state == 0 ? 1 : 0;
 }
 
 //wasPressed() and wasReleased() check the button state to see if it changed
@@ -91,12 +90,12 @@ uint8_t button::isReleased(void)
 //These functions do not cause the button to be read.
 uint8_t button::wasPressed(void)
 {
-	return _state && _changed;
+    return _state && _changed;
 }
 
 uint8_t button::wasReleased(void)
 {
-	return !_state && _changed;
+    return !_state && _changed;
 }
 
 //pressedFor(ms) and releasedFor(ms) check to see if the button is pressed (or released),
@@ -104,16 +103,16 @@ uint8_t button::wasReleased(void)
 //These functions do not cause the button to be read.
 uint8_t button::pressedFor(uint32_t ms)
 {
-	return (_state == 1 && _time - _lastChange >= ms) ? 1 : 0;
+    return (_state == 1 && _time - _lastChange >= ms) ? 1 : 0;
 }
 
 uint8_t button::releasedFor(uint32_t ms)
 {
-	return (_state == 0 && _time - _lastChange >= ms) ? 1 : 0;
+    return (_state == 0 && _time - _lastChange >= ms) ? 1 : 0;
 }
 
 //lastChange() returns the time of the last state change in milliseconds.
 uint32_t button::lastChange(void)
 {
-	return _lastChange;
+    return _lastChange;
 }