{"page":"\u003clink rel=\"stylesheet\" href=\"https://lessonplanet.com/assets/packs/css/resources-572d6a42.css\" /\u003e\n\u003clink rel=\"stylesheet\" href=\"https://lessonplanet.com/assets/packs/css/lp_boclips_stylesheets-f4d0de30.css\" media=\"all\" /\u003e\n\u003cdiv data-title='Tutorial 06: How to Blink an LED: Arduino Course for Absolute Beginners (ReM)' data-url='/boclips/videos/62a0e4881c259e357d94ff44' data-video-url='/boclips/videos/62a0e4881c259e357d94ff44' id='bo_player_modal'\u003e\n\u003cdiv class='boclips-resource-page modal-dialog panel-container'\u003e\n\u003cdiv class='react-notifications-root'\u003e\u003c/div\u003e\n\u003cdiv class='rp-header'\u003e\n\u003cdiv class='rp-type'\u003e\n\u003ci aria-hidden='true' class='fai fa-regular fa-circle-play'\u003e\u003c/i\u003e\nVideo\n\u003c/div\u003e\n\u003ch1 class='rp-title' id='video-title'\u003e\nTutorial 06: How to Blink an LED: Arduino Course for Absolute Beginners (ReM)\n\u003c/h1\u003e\n\u003cdiv class='rp-actions'\u003e\n\u003cdiv class='mr-1'\u003e\n\u003ca class=\"btn btn-success\" data-posthog-event=\"Signup: LP Signup Activity\" data-posthog-location=\"body_link_boclips\" data-remote=\"true\" href=\"/subscription/new\"\u003e\u003cspan\u003e\u003cspan\u003eGet Free Access\u003c/span\u003e\u003cspan class=\"\"\u003e for 10 Days\u003c/span\u003e\u003cspan\u003e!\u003c/span\u003e\u003c/span\u003e\u003c/a\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003cdiv class='rp-body'\u003e\n\u003cdiv class='rp-info'\u003e\n\u003cdiv aria-label='Hide resource details' class='rp-hide-info' role='button' tabindex='0'\u003e\u0026times;\u003c/div\u003e\n\u003ci aria-label='Expand resource details' class='rp-expand-info fai fa-solid fa-up-right-and-down-left-from-center' role='button' tabindex='0'\u003e\u003c/i\u003e\n\u003ci aria-label='Compress resource details' class='rp-compress-info fai fa-solid fa-down-left-and-up-right-to-center' role='button' tabindex='0'\u003e\u003c/i\u003e\n\u003cdiv class='rp-rating'\u003e\n\u003cspan class='resource-pool'\u003e\n\u003cspan class='pool-label'\u003ePublisher:\u003c/span\u003e\n\u003cspan class='pool-name'\u003e\n\u003cspan class='text'\u003e\u003ca data-publisher-id=\"30358947\" href=\"/search?publisher_ids%5B%5D=30358947\"\u003eProgramming Electronics Academy\u003c/a\u003e\u003c/span\u003e\n\u003c/span\u003e\n\u003c/span\u003e\n\u003c/div\u003e\n\u003cdiv class='rp-description'\u003e\n\u003cspan class='short-description'\u003eThe first program you usually write when learning a new programming language is called \"Hello World\".  The program outputs those words as its only function.  When learning to program micro-controllers such as the Arduino, the equivalent...\u003c/span\u003e\n\u003cspan class='full-description hide'\u003eThe first program you usually write when learning a new programming language is called \"Hello World\".  The program outputs those words as its only function.  When learning to program micro-controllers such as the Arduino, the equivalent of \"Hello World\" is a program that blinks an LED.  Guess what it is called - Blink.\u003cbr/\u003e\u003cbr/\u003eYou Will Need:\u003cbr/\u003e\u003cbr/\u003e1 LED (any color works fine)\u003cbr/\u003eA 220 Ohm Resistor\u003cbr/\u003eAn alligator clip (not essential but makes the circuit easier)\u003cbr/\u003eFourteen small and smooth rocks from the a western pacific island (not essential but adds an esoteric feel)\u003cbr/\u003eNOTE: On most Arduino boards there is an LED soldered right by pin 13 - it is actually connected to pin 13 - so if you do not have an LED laying around (or a resistor for that matter), you can use the board mounted LED - it will blink with the same sketch.\u003cbr/\u003e\u003cbr/\u003eStep-by-Step Instructions\u003cbr/\u003e\u003cbr/\u003eInsert the short leg of the LED into the pin labeled GND on your Arduino.\u003cbr/\u003e\u003cbr/\u003eConnect the 220 Ohm resistor to  pin 13 on the Arduino. It doesn't matter which way you connect the resistor.\u003cbr/\u003e\u003cbr/\u003eNow use the alligator clip to connect the long leg of the LED to the other leg of the resistor.  If you do not have an alligator clip, you can twist the two leads together as best as you can to get a steady electrical connection.\u003cbr/\u003e\u003cbr/\u003ePlug your Arduino board into your computer with a USB cable.\u003cbr/\u003eOpen up the Arduino IDE.\u003cbr/\u003e\u003cbr/\u003eGo to File,  Examples , 01.Basics, Blink\u003cbr/\u003e\u003cbr/\u003eClick the verify button on the top left. It should turn orange and then back to blue.\u003cbr/\u003e\u003cbr/\u003eClick the upload button.  It will also turn orange and then blue once the sketch has finished uploading to your Arduino board.\u003cbr/\u003e\u003cbr/\u003eNow monitor you Arduino board  - the LED should be blinking.\u003cbr/\u003e\u003cbr/\u003eMake sure to read the comments at the top.  Note the use of the multi-line comments syntax /* */.  It is always a good idea to take time and see what the programmer has to say about the sketch they have written. She will likely be terse about how the program works or what it is supposed to accomplish. She might tell you how to set up the circuit.\u003cbr/\u003e\u003cbr/\u003eThe first block of code you come to after the description is where they initialize and declare variables.  Here there is only one variable - and it gets declared and initialized on the same line.\u003cbr/\u003e\u003cbr/\u003eint led = 13; //declare and initialize a variable with a single statement\u003cbr/\u003e\u003cbr/\u003eYou should be familiar with this from the last tutorial on variables.  All we have done is made a variable and named it  \"led\".  This variable will hold integers and we put the value 13 into the variable.  If this seems confusing, it might not hurt to review the last tutorial on variables - or you can voyage on - your call.\u003cbr/\u003e\u003cbr/\u003eThe next block of code you encounter in the Blink sketch is...\u003cbr/\u003e\u003cbr/\u003evoid setup() \u003cbr/\u003e\u003cbr/\u003e// initialize the digital pin as an output.\u003cbr/\u003e\u003cbr/\u003epinMode(led, OUTPUT);\u003cbr/\u003e\u003cbr/\u003e\u003cbr/\u003e\u003cbr/\u003eRecall that the setup() function will be in almost every Arduino sketch that you encounter.  Inside the curly braces is code that will only be run once by your Arduino.  For this program we see the function pinMode() is being used.\u003cbr/\u003e\u003cbr/\u003eLet me start by saying that pinMode() is a wonderful function.  If you recall, functions can take arguments.  The pinMode() function takes two arguments - it wants to know which pin you are going to assign a mode to, and what mode you want that pin to be.   The pin number is easy, 0-13 for any of the digital pins, and A0 through A5 for any of the analog pins.\u003cbr/\u003e\u003cbr/\u003eThe mode is an easy designation also - you are going to want the pin to be an INPUT - good for reading a sensor.  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