Table of Contents
What does #define do in Arduino IDE?
Description. #define is a useful C++ component that allows the programmer to give a name to a constant value before the program is compiled. Defined constants in arduino don’t take up any program memory space on the chip. The compiler will replace references to these constants with the defined value at compile time.
Why is #define used?
In the C Programming Language, the #define directive allows the definition of macros within your source code. These macro definitions allow constant values to be declared for use throughout your code. You generally use this syntax when creating constants that represent numbers, strings or expressions.
What is difference between int and define?
In both cases the preferred notation is int array[size] with no space between the name and square brackets. Yes you can, and it actually better to understand. However, defines use all UPPERCASE letters, so when people are reading your code, they will know that SIZE is a constant.
What is the difference between define and int in Arduino?
#define is almost literally a find-and-replace. The compiler (more accurately the pre-processor) does that that before actually compiling your code. If you declare a variable (eg. “int a;”), you are defining a quantity that will be kept in memory, and you can change it.
What does int mean in Arduino?
Description. Integers are your primary data-type for number storage. On the Arduino Uno (and other ATMega based boards) an int stores a 16-bit (2-byte) value. This yields a range of -32,768 to 32,767 (minimum value of -2^15 and a maximum value of (2^15) – 1).
What is a constant in Arduino?
Description. The const keyword stands for constant. It is a variable qualifier that modifies the behavior of the variable, making a variable “read-only”. This means that the variable can be used just as any other variable of its type, but its value cannot be changed.
What is the advantage of define over const?
The use of an enumeration constant (enum) has many advantages over using the traditional symbolic constant style of #define. These advantages include a lower maintenance requirement, improved program readability, and better debugging capability.
What is integer in Arduino?
Integers are your primary data-type for number storage. On the Arduino Uno (and other ATmega based boards) an int stores a 16-bit (2-byte) value. This yields a range of -32,768 to 32,767 (minimum value of -2^15 and a maximum value of (2^15) – 1).
What is volatile in Arduino?
Description. volatile is a keyword known as a variable qualifier, it is usually used before the datatype of a variable, to modify the way in which the compiler and subsequent program treat the variable. Declaring a variable volatile is a directive to the compiler.
What language does the Arduino IDE use?
The “Arduino language” is simply C++ (and therefore also C). All the standard system librarys are written in C/C++ and the IDE uses the gcc g++ compiler.
What is an Arduino and what can an Arduino do?
Arduino is an open-source electronics platform based on easy-to-use hardware and software. Arduino boards are able to read inputs – light on a sensor, a finger on a button, or a Twitter message – and turn it into an output – activating a motor, turning on an LED, publishing something online.
What is the purpose of an Arduino?
Arduino is a great tool for developing interactive objects, taking inputs from a variety of switches or sensors and controlling a variety of lights, motors and other outputs.
What are the uses of Arduino?
Arduino is just a microcontroller board. Similar devices are used for everything from industrial process control, to controlling elevators, flying planes, and in alarm systems. However, arduino is not considered an industry quality device.