{"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 11: If Statement Conditionals: Arduino Course for Absolute Beginners (ReM)' data-url='/boclips/videos/62a0e488e0c1b1390d74cb98' data-video-url='/boclips/videos/62a0e488e0c1b1390d74cb98' 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 11: If Statement Conditionals: 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'\u003eIn the last lesson we learned about the \"If statement\".  The \"If statement\" was the perfect choice for setting up instructions to run only when certain conditions are met.  \"If 30 seconds has passed - stop the heating element\" or \"If the...\u003c/span\u003e\n\u003cspan class='full-description hide'\u003eIn the last lesson we learned about the \"If statement\".  The \"If statement\" was the perfect choice for setting up instructions to run only when certain conditions are met.  \"If 30 seconds has passed - stop the heating element\" or \"If the sensor perceives a wall - turn 180 Degrees\". This lesson will expand on this amazingly useful function and show you how to stack different conditions to meet the flexibility you will want in your designs.\u003cbr/\u003e\u003cbr/\u003eYou Will Need\u003cbr/\u003e\u003cbr/\u003ePotentiometer (doesn't matter what resistance range)\u003cbr/\u003e220 Ohm Resistor\u003cbr/\u003eLED (any color)\u003cbr/\u003eJumper Wires (3)\u003cbr/\u003esolder-less breadboard\u003cbr/\u003eAlligator Clip\u003cbr/\u003eDull machete with wooded handle\u003cbr/\u003eStep-by-Step Instructions\u003cbr/\u003e\u003cbr/\u003ePlace your potentiometer in the breadboard.\u003cbr/\u003ePlace a jumper wire from one of the outside leads of the potentiometer to the 5V pin on Arduino.\u003cbr/\u003ePlace a jumper wire from the other outside lead of the potentiometer to one of the GND pins.\u003cbr/\u003ePlace the final jumper wire from the center pin of the potentiometer to the A0 pin.\u003cbr/\u003eConnect either side of the 220-Ohm resistor to pin 13.\u003cbr/\u003eConnect the short leg of the LED to the GND (the GND pin next to pin 13 is the most convenient).\u003cbr/\u003eAttach the other leg of the resistor to the long leg of the LED.\u003cbr/\u003ePlug your Arduino into your computer with the USB cable.\u003cbr/\u003eOpen the Arduino IDE.\u003cbr/\u003eGo to File, Examples, 05.Control, IfStatementConditionals\u003cbr/\u003eClick the Verify button (Top Left).  The button will turn orange and then blue once finished.\u003cbr/\u003eClick the Upload button.  The button will turn orange and then blue when finished.\u003cbr/\u003eOpen up the Serial Monitor window.  Tools, Serial Monitor.\u003cbr/\u003eAdjust the potentiometer and watch as the LED turns on and off based on the knob position.\u003cbr/\u003e\u003cbr/\u003eCircuit Talk\u003cbr/\u003e\u003cbr/\u003eIf you recall from the previous lessons, a potentiometer is a voltage divider. You have 5 volts at one side of the potentiometer and 0 volts at the other side - you are using the 5volt pin and the GND pin.   As you adjust the knob on the potentiometer the amount voltage that will be applied to the center pin changes.  The voltage is being divided.  This means that the voltage at pin A0 where the center pin is attached will be somewhere between 0 and 5 volts based on where you have the potentiometer knob adjusted.\u003cbr/\u003e\u003cbr/\u003eDiscuss the Sketch\u003cbr/\u003e\u003cbr/\u003eBelow is the sketch in its entirety from the Arduino IDE. The basic concept of the sketch is this - we measure voltage at an analog pin from 0 to 1023 - this voltage changes based on where the knob of the potentiometer is set.  Then we define a threshold value somewhere in this range, lets pick the number 400.  When the value measured at the analog pin is above 400, we turn on the LED at pin 13, when the voltage is below 400 we turn the LED off.  It's as easy as that.\u003cbr/\u003e\u003cbr/\u003eMake sure you read this sketch and try to figure out what is taking place before moving on.\u003cbr/\u003e\u003cbr/\u003eThis program might look kind of long to you - the previous ones were a bit shorter.  A good way to approach any program long or short is to cut it up into chunks and only consider pieces of it at a time. The first chunk is this sketch is the multi-line comments that clearly describe:\u003cbr/\u003e\u003cbr/\u003eWhat the program will do\u003cbr/\u003eGenerally how the program will accomplish it\u003cbr/\u003eHow to set up the circuit and the components you will need\u003cbr/\u003eAny pertinent notes\u003cbr/\u003eThe license the program is released under (if any)\u003cbr/\u003eThe author, date and version number\u003cbr/\u003eThis might seem like a lot of stuff - but I would recommend you do the same thing for your programs!  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