Arduino – Variables & Constants


If you’re a budding electronics enthusiast looking to get a better understanding of Arduino, then you’ve come to the right place! Today we’ll be uncovering the magical world of variables and constants in order to gain insight into this powerful yet versatile tool.

We’ll go over what they are, why they’re important, and how you can use them for your projects. So let’s dive straight in and find out more about Arduino variables & constants!

Arduino – Variables & Constants

Arduino is a powerful programming tool for creating microcontroller-based projects. It provides immense possibilities to build exciting projects with ease. Arduino variables and constants are essential components in any program, as they hold values that can be used and manipulated by the code.

Variables are containers for data and can be changed during the program’s execution while constants are fixed values that cannot be changed during run-time. In Arduino programming, variables and constants are used to assign values to different parts of the code.

The Arduino language provides four types of data types which include integer, float, char array (string), and Boolean. An integer is a whole number that may be positive or negative; float is a decimal point number; char array (string) is an array of characters; and the Boolean is either true or false. When it comes to Arduino programming, Arduinos and constants come in handy for controlling the data within a program.

Arduino – Variables

A variable is a named memory location in which data can be stored and retrieved during the course of the program. When declaring a variable, it must have a type specified along with its name. For example to declare an integer named “myInteger”: int myInteger = 0; This assigns the value of 0 to the integer. There are three types of variables you can use with Arduino:
Local Variables.
Global Variables.
Variables used in formal parameters

Local Variables

These are declared inside the block or the body of a function. Local variables can only be accessed within their own scope or inside the same function they were created in. This means that if you declare a variable inside one function it won’t be recognized outside of it; however, all functions have access to local variables defined before them in the code.

Global Variables

These are accessible across the entire Arduino program, regardless of size or scope. Global variables can be accessed from any function, but it is important to define them outside of any functions in order to maintain their availability throughout the code.

Formal Parameters

Formal parameters are used as placeholders for values that will be passed into a function. The variable declared within the parenthesis of a function is known as a formal parameter and is only visible within that function; they have local scope. Formal parameters contain data that was passed into the function when it was called and can change each time the function runs since they’re linked to whatever value was passed into them.

Arduino – Constants

Constants are pieces of information that do not change over time. Since they cannot be modified by the program, they provide stability and help to ensure that the code remains consistent. In Arduino programming, constants can be declared as integers, strings, or floating-point numbers (decimals). They must also have a type — such as const int or const float — assigned before they are used in Arduino functions or operations.

Constants are declared in a similar way but instead use the keyword “const” followed by its type, name, and value. For example, to declare a constant named “myConstant” with value 6: const int myConstant = 6; This assigns the fixed value of 6 that cannot be changed during run-time.

Variables and constants play an important role in Arduino programming by allowing different sections of code to interact with one another and make changes over time. It is important to remember when using Arduino variables and constants that they must be declared before use, as Arduino does not automatically create them for you.

Furthermore, Arduino does not provide any garbage collection or memory management so all variables and constants need to be manually removed once no longer needed.
By understanding how these two concepts work together, Arduino programmers can more effectively create complex programs that take advantage of dynamic information and remain stable for the duration of their life cycle.

Mataf Khan

An electronics enthusiasts from childhood became an electrical engineer, I've been playing with Arduino and other electronics gadgets like raspberry pi since when I was 14. and have a passion of troubleshooting Arduino problems.

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