Adding blink without delay example.

build/shared/dist/examples/Digital/BlinkWithoutDelay/BlinkWithoutDelay.pde

@@ -0,0 +1,38 @@
+/* Blink without Delay
+ *
+ * Turns on and off a light emitting diode(LED) connected to a digital  
+ * pin, without using the delay() function.  This means that other code
+ * can run at the same time without being interrupted by the LED code.
+ *
+ * http://www.arduino.cc/en/Tutorial/BlinkWithoutDelay
+ */
+
+int ledPin = 13;                // LED connected to digital pin 13
+int value = LOW;                // previous value of the LED
+long previousMillis = 0;        // will store last time LED was updated
+long interval = 1000;           // interval at which to blink (milliseconds)
+
+void setup()
+{
+  pinMode(ledPin, OUTPUT);      // sets the digital pin as output
+}
+
+void loop()
+{
+  // here is where you'd put code that needs to be running all the time.
+
+  // check to see if it's time to blink the LED; that is, is the difference
+  // between the current time and last time we blinked the LED bigger than
+  // the interval at which we want to blink the LED.
+  if (millis() - previousMillis > interval) {
+    previousMillis = millis();   // remember the last time we blinked the LED
+
+    // if the LED is off turn it on and vice-versa.
+    if (value == LOW)
+      value = HIGH;
+    else
+      value = LOW;
+
+    digitalWrite(ledPin, value);
+  }
+}