![]() Then, the code inside the void loop will be executed again and again (hence the name “loop”), until you: The code inside the void setup will be executed once, and only once, at the beginning of the program. When the loop function exists, go back to step 4.Now the loop function will be called, so all the code inside the loop will be executed.All the code you’ve written inside this function will be executed.The setup function will be called once.Variables that you create on top of the program will be declared/initialized.How void setup and void loop work PrincipleĪs the “main” function is called when you run a C/C program, the setup and loop functions will be automatically called. You just need to make sure that the void setup and void loop are present. On top of them, you can add any number of functions, variables, and create as many files as you want. Instead of one mandatory function, you have 2.Īll your Arduino program must include those functions. This main function will be called first, and from there, you will call other functions and execute the functionalities of your program. When you run a “standard” C/C program, you have to write a “main” function. # Example of what's happening when there is no void setup() function in your Arduino programĬ:\Users\user\AppData\Local\Temp\: In function `main':Ĭ:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino/main.cpp:43: undefined reference to `setup'Ĭollect2.exe: error: ld returned 1 exit status Try to compile a code with one of those functions missing, and you’ll get an error. The Arduino void setup and void loop functions are mandatory. Void setup and void loop: mandatory functions in Arduino Writing Arduino programs – best practices for void loop and void setup. ![]() ![]()
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