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build/shared/examples/02.Digital/StateChangeDetection/StateChangeDetection.ino

@@ -1,28 +1,28 @@
 /*
   State change detection (edge detection)
- 	
+
  Often, you don't need to know the state of a digital input all the time,
  but you just need to know when the input changes from one state to another.
  For example, you want to know when a button goes from OFF to ON.  This is called
  state change detection, or edge detection.
- 
+
  This example shows how to detect when a button or button changes from off to on
  and on to off.
- 	
+
  The circuit:
  * pushbutton attached to pin 2 from +5V
  * 10K resistor attached to pin 2 from ground
  * LED attached from pin 13 to ground (or use the built-in LED on
    most Arduino boards)
- 
+
  created  27 Sep 2005
  modified 30 Aug 2011
  by Tom Igoe
 
 This example code is in the public domain.
- 	
+
  http://arduino.cc/en/Tutorial/ButtonStateChange
- 
+
  */
 
 // this constant won't change:
@@ -58,30 +58,30 @@ void loop() {
       Serial.println("on");
       Serial.print("number of button pushes:  ");
       Serial.println(buttonPushCounter);
-    } 
+    }
     else {
       // if the current state is LOW then the button
       // wend from on to off:
-      Serial.println("off"); 
+      Serial.println("off");
     }
     // Delay a little bit to avoid bouncing
     delay(50);
   }
-  // save the current state as the last state, 
+  // save the current state as the last state,
   //for next time through the loop
   lastButtonState = buttonState;
 
-  
-  // turns on the LED every four button pushes by 
+
+  // turns on the LED every four button pushes by
   // checking the modulo of the button push counter.
-  // the modulo function gives you the remainder of 
+  // the modulo function gives you the remainder of
   // the division of two numbers:
   if (buttonPushCounter % 4 == 0) {
     digitalWrite(ledPin, HIGH);
   } else {
-   digitalWrite(ledPin, LOW);
+    digitalWrite(ledPin, LOW);
   }
-  
+
 }