arduino-0018-linux-x64

arduino-0018-linux-x64/examples/Digital/BlinkWithoutDelay/BlinkWithoutDelay.pde

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+/* 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.
+ 
+  The circuit:
+ * LED attached from pin 13 to ground.
+ * 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 17 Jun 2009
+ by Tom Igoe
+ 
+ http://www.arduino.cc/en/Tutorial/BlinkWithoutDelay
+ */
+
+// constants won't change. Used here to 
+// set pin numbers:
+const int ledPin =  13;      // the number of the LED pin
+
+// 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)
+
+void setup() {
+  // set the digital pin as output:
+  pinMode(ledPin, 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) {
+    // save the last time you blinked the LED 
+    previousMillis = millis();   
+
+    // if the LED is off turn it on and vice-versa:
+    if (ledState == LOW)
+      ledState = HIGH;
+    else
+      ledState = LOW;
+      
+    // set the LED with the ledState of the variable:
+    digitalWrite(ledPin, ledState);
+  }
+}