Updated Blink without delay example

Changed variable to unsigned long.

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

@@ -9,29 +9,31 @@
  * Note: on most Arduinos, there is already an LED on the board
  that's attached to pin 13, so no hardware is needed for this example.
  
- 
  created 2005
  by David A. Mellis
  modified 8 Feb 2010
  by Paul Stoffregen
+ modified 11 Nov 2013
+ by Scott Fitzgerald
+ 
  
  This example code is in the public domain.
-
  
  http://www.arduino.cc/en/Tutorial/BlinkWithoutDelay
  */
 
-// constants won't change. Used here to 
-// set pin numbers:
+// constants won't change. Used here to set a pin number :
 const int ledPin =  13;      // the number of the LED pin
 
-// Variables will change:
+// Variables will change :
 int ledState = LOW;             // ledState used to set the LED
-long previousMillis = 0;        // will store last time LED was updated
 
-// the follow variables is a long because the time, measured in miliseconds,
-// will quickly become a bigger number than can be stored in an int.
-long interval = 1000;           // interval at which to blink (milliseconds)
+// Generally, you shuould use "unsigned long" for variables that hold time
+// The value will quickly become too large for an int to store
+unsigned long previousMillis = 0;        // will store last time LED was updated
+
+// constants won't change :
+const long interval = 1000;           // interval at which to blink (milliseconds)
 
 void setup() {
   // set the digital pin as output:
@@ -48,7 +50,7 @@ void loop()
   // blink the LED.
   unsigned long currentMillis = millis();
  
-  if(currentMillis - previousMillis > interval) {
+  if(currentMillis - previousMillis >= interval) {
     // save the last time you blinked the LED 
     previousMillis = currentMillis;