2.1 Lab: Blinking LED

In the following Lab you will be able to write your first Arduino application. Although very simple, mastering it will provide you with clear understanding of the IDE and the components that conform the Arduino environment.

This first Lab consist of a simple code that will turn on or off an LED connected to an Arduino digital IO port.

Do not hesitate in sharing your work with us. Record a video, upload it to YouTube or other video site and post the link in the discussion below so we can all comment.

Have fun!


  Turns on an LED on for one second, then off for one second, repeatedly.
  This example code is in the public domain.

// 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 loop routine 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

Activity: Make your blinking let and personalize it to your taste. Tell us about your blinking LED and if you include pictures or videos in a blog post it is even better.

Don't forget to apply for your badge when you are done!

View Projects 2014 Edition


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