diff --git a/inc/MicroBitButton.h b/inc/MicroBitButton.h
index 59370d4..972aeae 100644
--- a/inc/MicroBitButton.h
+++ b/inc/MicroBitButton.h
@@ -17,8 +17,8 @@
 #define MICROBIT_BUTTON_EVT_HOLD                5
 #define MICROBIT_BUTTON_EVT_DOUBLE_CLICK        6
 
-#define MICROBIT_BUTTON_LONG_CLICK_TIME         1000  
-#define MICROBIT_BUTTON_HOLD_TIME               1500  
+#define MICROBIT_BUTTON_LONG_CLICK_TIME         1000
+#define MICROBIT_BUTTON_HOLD_TIME               1500
 
 #define MICROBIT_BUTTON_STATE                   1
 #define MICROBIT_BUTTON_STATE_HOLD_TRIGGERED    2
@@ -47,27 +47,27 @@ class MicroBitButton : public MicroBitComponent
 {
     PinName name;                                           // mbed pin name of this pin.
     DigitalIn pin;                                          // The mbed object looking after this pin at any point in time (may change!).
-    
+
     unsigned long downStartTime;                            // used to store the current system clock when a button down event occurs
     uint8_t sigma;                                          // integration of samples over time. We use this for debouncing, and noise tolerance for touch sensing
     MicroBitButtonEventConfiguration eventConfiguration;    // Do we want to generate high level event (clicks), or defer this to another service.
-    
+
     public:
 
     /**
-      * Constructor. 
+      * Constructor.
       * Create a pin representation with the given ID.
       * @param id the ID of the new MicroBitButton object.
       * @param name the physical pin on the processor that this butotn is connected to.
       * @param mode the configuration of internal pullups/pulldowns, as define in the mbed PinMode class. PullNone by default.
       *
       * Example:
-      * @code 
+      * @code
       * buttonA(MICROBIT_ID_BUTTON_A,MICROBIT_PIN_BUTTON_A); //a number between 0 and 200 inclusive
       * @endcode
       *
       * Possible Events:
-      * @code 
+      * @code
       * MICROBIT_BUTTON_EVT_DOWN
       * MICROBIT_BUTTON_EVT_UP
       * MICROBIT_BUTTON_EVT_CLICK
@@ -77,25 +77,25 @@ class MicroBitButton : public MicroBitComponent
       * @endcode
       */
     MicroBitButton(uint16_t id, PinName name, MicroBitButtonEventConfiguration eventConfiguration = MICROBIT_BUTTON_ALL_EVENTS, PinMode mode = PullNone);
-    
+
     /**
       * Tests if this Button is currently pressed.
       * @return 1 if this button is pressed, 0 otherwise.
       *
       * Example:
-      * @code 
+      * @code
       * if(uBit.buttonA.isPressed())
       *     print("Pressed!");
       * @endcode
       */
     int isPressed();
-    
+
     /**
       * periodic callback from MicroBit clock.
       * Check for state change for this button, and fires a hold event if button is pressed.
-      */  
+      */
     virtual void systemTick();
-    
+
 };
 
 #endif
diff --git a/source/MicroBitButton.cpp b/source/MicroBitButton.cpp
index 1311447..0e4be60 100644
--- a/source/MicroBitButton.cpp
+++ b/source/MicroBitButton.cpp
@@ -1,19 +1,19 @@
 #include "MicroBit.h"
 
 /**
-  * Constructor. 
+  * Constructor.
   * Create a pin representation with the given ID.
   * @param id the ID of the new MicroBitButton object.
   * @param name the physical pin on the processor that this butotn is connected to.
   * @param mode the configuration of internal pullups/pulldowns, as define in the mbed PinMode class. PullNone by default.
   *
   * Example:
-  * @code 
+  * @code
   * buttonA(MICROBIT_ID_BUTTON_A,MICROBIT_PIN_BUTTON_A); //a number between 0 and 200 inclusive
   * @endcode
   *
   * Possible Events:
-  * @code 
+  * @code
   * MICROBIT_BUTTON_EVT_DOWN
   * MICROBIT_BUTTON_EVT_UP
   * MICROBIT_BUTTON_EVT_CLICK
@@ -34,9 +34,9 @@ MicroBitButton::MicroBitButton(uint16_t id, PinName name, MicroBitButtonEventCon
 /**
   * periodic callback from MicroBit clock.
   * Check for state change for this button, and fires a hold event if button is pressed.
-  */  
+  */
 void MicroBitButton::systemTick()
-{   
+{
     //
     // If the pin is pulled low (touched), increment our culumative counter.
     // otherwise, decrement it. We're essentially building a lazy follower here.
@@ -45,37 +45,37 @@ void MicroBitButton::systemTick()
     //
     if(!pin)
     {
-        if (sigma < MICROBIT_BUTTON_SIGMA_MAX) 
-            sigma++;  
+        if (sigma < MICROBIT_BUTTON_SIGMA_MAX)
+            sigma++;
     }
     else
     {
-        if (sigma > MICROBIT_BUTTON_SIGMA_MIN) 
+        if (sigma > MICROBIT_BUTTON_SIGMA_MIN)
             sigma--;
     }
-    
+
     // Check to see if we have off->on state change.
     if(sigma > MICROBIT_BUTTON_SIGMA_THRESH_HI && !(status & MICROBIT_BUTTON_STATE))
     {
         // Record we have a state change, and raise an event.
         status |= MICROBIT_BUTTON_STATE;
         MicroBitEvent evt(id,MICROBIT_BUTTON_EVT_DOWN);
-    
+
         //Record the time the button was pressed.
-        downStartTime=ticks;        
+        downStartTime=ticks;
     }
-    
-    // Check to see if we have on->off state change.    
+
+    // Check to see if we have on->off state change.
     if(sigma < MICROBIT_BUTTON_SIGMA_THRESH_LO && (status & MICROBIT_BUTTON_STATE))
     {
         status = 0;
         MicroBitEvent evt(id,MICROBIT_BUTTON_EVT_UP);
-   
+
        if (eventConfiguration == MICROBIT_BUTTON_ALL_EVENTS)
-       { 
+       {
            //determine if this is a long click or a normal click and send event
            if((ticks - downStartTime) >= MICROBIT_BUTTON_LONG_CLICK_TIME)
-               MicroBitEvent evt(id,MICROBIT_BUTTON_EVT_LONG_CLICK);    
+               MicroBitEvent evt(id,MICROBIT_BUTTON_EVT_LONG_CLICK);
            else
                MicroBitEvent evt(id,MICROBIT_BUTTON_EVT_CLICK);
        }
@@ -86,7 +86,7 @@ void MicroBitButton::systemTick()
     {
         //set the hold triggered event flag
         status |= MICROBIT_BUTTON_STATE_HOLD_TRIGGERED;
-        
+
         //fire hold event
         MicroBitEvent evt(id,MICROBIT_BUTTON_EVT_HOLD);
     }