Code organization with functions in Arduino - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the main purpose of using functions in Arduino code?

Functions help organize code into smaller, reusable blocks. This makes the code easier to read, understand, and maintain.

beginner

How do you define a function in Arduino?

You write the return type, function name, parentheses with parameters (if any), and curly braces containing the code. For example:<br>

void blinkLED() {<br>  digitalWrite(LED_BUILTIN, HIGH);<br>  delay(1000);<br>  digitalWrite(LED_BUILTIN, LOW);<br>  delay(1000);<br>}

beginner

What is the difference between 'void' and other return types in function definitions?

'void' means the function does not return any value. Other return types like 'int' or 'float' mean the function sends back a value when it finishes.

beginner

Why is it helpful to call functions inside the loop() function in Arduino?

Calling functions inside loop() keeps the main code clean and easy to follow. It also allows repeating tasks by just calling the function multiple times.

beginner

Can functions in Arduino take inputs? How?

Yes, functions can take inputs called parameters. You put them inside the parentheses when defining the function. For example:<br>

void blinkLED(int delayTime) {<br>  digitalWrite(LED_BUILTIN, HIGH);<br>  delay(delayTime);<br>  digitalWrite(LED_BUILTIN, LOW);<br>  delay(delayTime);<br>}

What keyword is used to define a function that does not return a value in Arduino?

A void

B int

C return

D function

The keyword 'void' means the function does not return any value.

Where do you usually call your functions to run repeatedly in an Arduino sketch?

A void

B setup()

C main()

D loop()

The loop() function runs repeatedly, so calling your functions inside loop() makes them run over and over.

What is the benefit of breaking code into functions?

A Organizes code into reusable parts

B Makes code longer

C Makes code harder to read

D Slows down the program

Functions organize code into smaller, reusable parts, making it easier to read and maintain.

How do you pass information to a function in Arduino?

A Using return statements

B Using global variables only

C Using parameters inside parentheses

D Using comments

You pass information to functions by adding parameters inside the parentheses when defining or calling the function.

Which of these is a correct function call in Arduino?

A blinkLED;

B blinkLED()

C void blinkLED()

D blinkLED{}

To call a function, you use its name followed by parentheses, like blinkLED().

Explain how functions help organize Arduino code and give an example of a simple function.

Think about how breaking tasks into small steps makes your code easier to manage.

Describe how to pass a value to a function and use it inside the function in Arduino.

Consider how you tell a friend exactly what to do by giving details.