{"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='What is Serial.begin(9600)?' data-url='/boclips/videos/62a0e5b043c83676dc4934c7' data-video-url='/boclips/videos/62a0e5b043c83676dc4934c7' 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\nWhat is Serial.begin(9600)?\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'\u003eWHAT IS SERIAL.BEGIN(9600)?Are you wondering what Serial.begin(9600) does?You’ve probably seen it in most of the Arduino programs you’ve looked at – but what’s it there for?! Do you even need to use Serial.begin()?What if you change the...\u003c/span\u003e\n\u003cspan class='full-description hide'\u003eWHAT IS SERIAL.BEGIN(9600)?\u003cbr/\u003eAre you wondering what Serial.begin(9600) does?\u003cbr/\u003e\u003cbr/\u003eYou’ve probably seen it in most of the Arduino programs you’ve looked at – but what’s it there for?! Do you even need to use Serial.begin()?\u003cbr/\u003e\u003cbr/\u003eWhat if you change the number 9600? I mean, what’s 9600 even mean?!\u003cbr/\u003e\u003cbr/\u003eIn this lesson you will learn exactly what Serial.begin does, when you NEED to use it, and what the heck the 9600 means.\u003cbr/\u003e\u003cbr/\u003eWHAT DOES SERIAL.BEGIN(9600) DO?\u003cbr/\u003eLet’s get straight to this…\u003cbr/\u003e\u003cbr/\u003eSerial.begin() establishes serial communication between your Arduino board and another device. The most common use of serial communication you will establish is between your Arduino and your computer via a USB cable – or should I say a Universal Serial Bus cable.\u003cbr/\u003e\u003cbr/\u003eWhen you have established serial communication between two devices, it allows the two devices to communicate using a serial protocol.\u003cbr/\u003e\u003cbr/\u003eSo let’s answer a couple practical questions…\u003cbr/\u003e\u003cbr/\u003eWHEN DO I NEED TO USE SERIAL.BEGIN()?\u003cbr/\u003eThe most common reason to use serial.begin() is when you want to output some information from your Arduino to your computer screen.\u003cbr/\u003e\u003cbr/\u003eThat is, you want to print some text out.\u003cbr/\u003e\u003cbr/\u003eThe function used to display text on your computer screen from your Arduino board is the serial.print() function.\u003cbr/\u003e\u003cbr/\u003evoid setup() {\u003cbr/\u003e  Serial.begin(9600);\u003cbr/\u003e}\u003cbr/\u003e\u003cbr/\u003evoid loop() {\u003cbr/\u003e  Serial.print(\"Look Ma, I’m in the phone book!\");\u003cbr/\u003e}\u003cbr/\u003eThe text that gets printed out shows up on the Serial Monitor window – which can be opened from the menu bar under Tools / Serial Monitor. Or with the shortcut key CTRL + SHIFT + M (on PC) or Command + Shift + M (MacOs).\u003cbr/\u003e\u003cbr/\u003eThere are other times you’ll use serial.begin(), for example, maybe you have an application running on your computer that will be expecting data from your Arduino over a serial port. In these cases, you’ll also need Serial.begin().\u003cbr/\u003e\u003cbr/\u003eWHERE DOES SERIAL.BEGIN() GO IN THE ARDUINO SKETCH?\u003cbr/\u003e99% of the time, you’ll be putting the Serial.begin() function inside of the setup() function. As you may know, setup() only runs once, and since you’ll only need to establish the Serial Communication one time – it makes sense to have it there.\u003cbr/\u003e\u003cbr/\u003eWHAT’S WITH THE NUMBER 9600?\u003cbr/\u003eThat number is called the baud rate. Probably the most important practical thing you need to know, is that for serial communication to work the baud rate in Serial.begin() and the baud rate set on the receiving device need to match.\u003cbr/\u003e\u003cbr/\u003eIf you are using the Arduino IDE Serial Monitor window to read the information from your Arduino, then you can use the baud rate drop down to set the baud rate.\u003cbr/\u003e\u003cbr/\u003eRemember! If these two values don’t match – then anything you try to send over serial will not work right.\u003cbr/\u003e\u003cbr/\u003eIt’s like, as a kid, did you and a friend ever come up with a long distance communication protocol?\u003cbr/\u003e\u003cbr/\u003eLike, 2 hoots meant, “Is anyone at the fort?”, and the appropriate response was two hoots back?\u003cbr/\u003e\u003cbr/\u003eBut if you both didn’t agree on that protocol beforehand, and your friend was cawing, instead of hooting, then you were like, what is he trying to say? Same thing with the baud rate – remember these have to match!\u003cbr/\u003e\u003cbr/\u003eSO LET’S DO A REVIEW HERE:\u003cbr/\u003eSerial.begin() is used to establish serial communication\u003cbr/\u003eSerial communication is one way to allow to devices to talk to each other\u003cbr/\u003eMost often, you’ll need to use Serial.begin() when you want to print something to your computer screen from your Arduino. This would also require the Serial.print() function.\u003cbr/\u003eWell hey, I hope you found this helpful! If you’re curious about other features of the serial communication, make sure to check our membership program! 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