{"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='Using Serial.read() with Arduino | Part 2' data-url='/boclips/videos/62a0e48b8b9cc0130f1cb6f1' data-video-url='/boclips/videos/62a0e48b8b9cc0130f1cb6f1' 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\nUsing Serial.read() with Arduino | Part 2\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'\u003eNow let’s tackle the first step of our algorithm – we create a character array to hold the incoming message and a position variable to help us move through each element in the array. We’ll also create a constant to hold the max length of...\u003c/span\u003e\n\u003cspan class='full-description hide'\u003eNow let’s tackle the first step of our algorithm – we create a character array to hold the incoming message and a position variable to help us move through each element in the array. We’ll also create a constant to hold the max length of our message and use this to initialize the character array.\u003cbr/\u003e\u003cbr/\u003econst unsigned int MAX_MESSAGE_LENGTH = 12;\u003cbr/\u003e\u003cbr/\u003eNow we need to check if any bytes are available in the serial receive buffer and while there are we need to read in the bytes in and save them to a temporary variable. We can use a while loop, Serial.available, Serial.read() to make this happen.\u003cbr/\u003e\u003cbr/\u003eNow we need to check to see if the byte we read is a terminating character or not… We can use an if-else statement for that. If it’s not a terminating character we’ll do one thing, and if it is a terminating character we’ll do something else.\u003cbr/\u003e\u003cbr/\u003eNow if we do get the terminating character that means we have received our entire message and we can actually do something with the message or data we received. In this case we’ll print the message to the Serial Monitor window. We’ll also need to reset our character array to prepare for the next message.\u003cbr/\u003e\u003cbr/\u003eBefore we can call this complete, we need to enforce the max message length in the protocol. This will prevent us from exceeding the space that we allotted in our character array. We can add this guard to our existing if statement.\u003cbr/\u003e\u003cbr/\u003eif ( inByte != '\\n' \u0026\u0026 (message_pos - MAX_MESSAGE_LENGTH - 1) )\u003cbr/\u003eFULL SERIAL.READ() CODE\u003cbr/\u003e\u003cbr/\u003eHere is the complete code to use Serial.read() to read in the entire message:\u003cbr/\u003e\u003cbr/\u003e//Many thanks to Nick Gammon for the basis of this code\u003cbr/\u003econst unsigned int MAX_MESSAGE_LENGTH = 12;\u003cbr/\u003e\u003cbr/\u003evoid setup() {\u003cbr/\u003e Serial.begin(9600);\u003cbr/\u003e}\u003cbr/\u003e\u003cbr/\u003evoid loop() {\u003cbr/\u003e\u003cbr/\u003e //Check to see if anything is available in the serial receive buffer\u003cbr/\u003e while (Serial.available() _ 0)\u003cbr/\u003e {\u003cbr/\u003e   //Create a place to hold the incoming message\u003cbr/\u003e   static char message[MAX_MESSAGE_LENGTH];\u003cbr/\u003e   static unsigned int message_pos = 0;\u003cbr/\u003e\u003cbr/\u003e   //Read the next available byte in the serial receive buffer\u003cbr/\u003e   char inByte = Serial.read();\u003cbr/\u003e\u003cbr/\u003e   //Message coming in (check not terminating character) and guard for over message size\u003cbr/\u003e   if ( inByte != '\\n' \u0026\u0026 (message_pos - MAX_MESSAGE_LENGTH - 1) )\u003cbr/\u003e   {\u003cbr/\u003e     //Add the incoming byte to our message\u003cbr/\u003e     message[message_pos] = inByte;\u003cbr/\u003e     message_pos++;\u003cbr/\u003e   }\u003cbr/\u003e   //Full message received...\u003cbr/\u003e   else\u003cbr/\u003e   {\u003cbr/\u003e     //Add null character to string\u003cbr/\u003e     message[message_pos] = '\\0';\u003cbr/\u003e\u003cbr/\u003e     //Print the message (or do other things)\u003cbr/\u003e     Serial.println(message);\u003cbr/\u003e\u003cbr/\u003e     //Reset for the next message\u003cbr/\u003e     message_pos = 0;\u003cbr/\u003e   }\u003cbr/\u003e }\u003cbr/\u003e}\u003cbr/\u003e\u003cbr/\u003eOK. 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