USe LED_BUILTIN in BlinkWithoutDelay

Author: agdl

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

@@ -15,6 +15,8 @@
  by Paul Stoffregen
  modified 11 Nov 2013
  by Scott Fitzgerald
+ modified 9 Jan 2017
+ by Arturo Guadalupi
 
 
  This example code is in the public domain.
@@ -23,7 +25,7 @@
  */
 
 // constants won't change. Used here to set a pin number :
-const int ledPin =  13;      // the number of the LED pin
+const int ledPin =  LED_BUILTIN;// the number of the LED pin
 
 // Variables will change :
 int ledState = LOW;             // ledState used to set the LED