Updated Blink

removed the variable “led” and added some additional descriptive text

Author: shfitz

build/shared/examples/01.Basics/Blink/Blink.ino

@@ -1,24 +1,29 @@
 /*
   Blink
   Turns on an LED on for one second, then off for one second, repeatedly.
- 
+
+  Most Arduinos have an on-board LED you can control. On the Uno and
+  Leonardo, it is attached to digital pin 13. If you're unsure what
+  pin the on-board LED is connected to on your Arduino model, check
+  the documentation at http://arduino.cc
+
   This example code is in the public domain.
+
+  modified 8 May 2014
+  by Scott Fitzgerald
  */
- 
-// Pin 13 has an LED connected on most Arduino boards.
-// give it a name:
-int led = 13;
 
-// the setup routine runs once when you press reset:
-void setup() {                
-  // initialize the digital pin as an output.
-  pinMode(led, OUTPUT);     
+
+// the setup function runs once when you press reset or power the board
+void setup() {
+  // initialize digital pin 13 as an output.
+  pinMode(13, OUTPUT);
 }
 
-// the loop routine runs over and over again forever:
+// the loop function runs over and over again forever
 void loop() {
-  digitalWrite(led, HIGH);   // turn the LED on (HIGH is the voltage level)
-  delay(1000);               // wait for a second
-  digitalWrite(led, LOW);    // turn the LED off by making the voltage LOW
-  delay(1000);               // wait for a second
+  digitalWrite(13, HIGH);   // turn the LED on (HIGH is the voltage level)
+  delay(1000);              // wait for a second
+  digitalWrite(13, LOW);    // turn the LED off by making the voltage LOW
+  delay(1000);              // wait for a second
 }