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examples/BlinkWithoutDelay/BlinkWithoutDelay.ino

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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 8 Feb 2010
+ by Paul Stoffregen
+ modified 11 Nov 2013
+ by Scott Fitzgerald
+ modified 5 Oct 2014
+ by Pavel Brychta
+ 
+ 
+ This example code is in the public domain.
+ 
+ http://www.arduino.cc/en/Tutorial/BlinkWithoutDelay
+ */
+#include <interval.h>
+
+// constants won't change. Used here to set a pin number :
+const int ledPin =  13;      // the number of the LED pin
+
+// Variables will change :
+int ledState = LOW;             // ledState used to set the LED
+
+Interval blink;
+
+// constants won't change :
+const long blinkinterval = 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.
+
+  if (blink.expired()) {
+    blink.set(blinkinterval); // set new interval period
+    // 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);
+  }
+}
+