![]() ![]() The text between the opening and closing quotation marks ( "") is known as a string in programming. We must pass the text string to the function so that the function knows what to send out of the serial / USB port. println( "Executing instructions in main loop.") We pass a text string to the println() function as shown in this statement: Serial. Passing a Value to the println() Function The delay value in milliseconds (2000) is said to be passed to the function. We call the delay() function in the sketch as in the following statement: delay(2000) a number or text string) is used by a function, we must pass the value to the function. We do not see these statements or the function body because they are either part of the Arduino programming language or exist in an external function library. The delay() function has a function body that contains statements that cause it to perform a delay. Calling Functionsīy calling or using pre-existing functions, we are using code that someone else has already written. The setup() and loop() functions are automatically called at the right time because they are special Arduino functions. set up the serial port speed, cause a time delay, write text to the serial monitor window. The statements in these functions in the above sketch were calling pre-existing functions that perform the tasks that we want, e.g. void setup() ) and writing statements in the function body. Load the sketch to the Arduino and then open the serial monitor window to see the sketch output text as it runs. Type the sketch into your Arduino IDE, or copy and paste it into the IDE. The main_loop sketch shown below, demonstrates how the main loop works in an Arduino sketch. When the bottom of the loop function is reached, statements are executed from the top of the loop() function again, thus completing the "loop" as shown in the image below. Statements in the loop() function will be executed from top to bottom, until the bottom of the loop() function is reached. The main loop is where the actual operational functionality of the Arduino takes place – for example, if the Arduino is programmed to be a flashing light sequencer, then the flashing light functionality will be placed in the main loop. Once program execution has started in the main loop, the statements in the main loop will be executed continuously until the Arduino is switched off or reset. After statements that only need to be run once have finished being executed in the setup() function, program execution starts in the loop() function. The loop() function is the main loop in the Arduino sketch. The Main LoopĪs seen in the previous part of this course, an Arduino sketch consists of two main functions called setup() and loop(). This is explained in the second half of this part of the course. We say that we "call a function" when we use a function to perform its specified task. A function in a sketch performs some task (i.e. ![]()
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