Arduino
arduino.cc › en › Reference › int
int | Arduino Documentation
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). On the Arduino Due and SAMD based boards (like MKR 1000 WiFi and Zero), an int stores a 32-bit (4-byte) ...
Arduino Forum
forum.arduino.cc › forum 2005-2010 (read only) › software › syntax & programs
defining an number with a set range. - Syntax & Programs - Arduino Forum
March 14, 2010 - Hi all, i'm tryin to define an intiger with a defined range of 0-360. when i defineit i want it to rollover the numver count like an int. e.g. if it's on 360 and does a count +1 it goes to 0 and if i do a count -1 it g…
Is it possible to set a variable to a range of values? PID TVC Attempt
Hi All, I wanted to know if it's possible to set a variable to a range or any value between two values. Here's a brief reason as to why I'm attempting this in case there is a better way for me to go about things. I'm trying to programme a PID controlled thrust vector system to self balance. More on forum.arduino.cc
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December 29, 2020Q: Why is " A0 " a int type ?
A0 is just the name of another constant int defined in another file. So your statement says create a constant int and give it the value of the constant unsigned int called A0. Not that an unsigned int can be put into a signed (int) if its value is not greater than the positive range of the int. A0 is actually contains the value 14. It could easily have been called DAVE99 or AHMED_SMITH. But obviously it wasn't as A0 was what the Arduino team wanted to label the first analogue pin (pin 14) Here is the definition #define PIN_A0 (14) #define PIN_A1 (15) #define PIN_A2 (16) #define PIN_A3 (17) #define PIN_A4 (18) #define PIN_A5 (19) #define PIN_A6 (20) #define PIN_A7 (21) static const uint8_t A0 = PIN_A0; static const uint8_t A1 = PIN_A1; static const uint8_t A2 = PIN_A2; static const uint8_t A3 = PIN_A3; static const uint8_t A4 = PIN_A4; static const uint8_t A5 = PIN_A5; static const uint8_t A6 = PIN_A6; static const uint8_t A7 = PIN_A7; A define is just a const into defined in the preprocessor (the runs before the compiler). See here https://forum.arduino.cc/t/using-a-variable-to-store-an-analog-pin-number/525930/2 More on reddit.com
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August 4, 2021Data types for UNO R4 etc
As detailed in this Arduino doc: On older Arduino MPU's the int data type range is 16 bits, range -32,768 to 32768 Whereas on SAMD MPU's (+ I assume UNO R4) an int is 32 bits, range -2,147,483,648 to 2,147,483,647 What are ranges of long and unsigned long on the SAMD & Renesas MPU architectures? More on forum.arduino.cc
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October 24, 2023How many integers can be stored in the Array function at a time in Arduino Uno? can I store around 5000 integers in a single array variable?
Syntactically, you can have pretty much have any number of elements in an array. So yes, you can, syntactically, index 5,000 or even more integers or other things in an array. but .... Each thing you store takes memory. An integer requires 2 bytes. So an array or 5,000 integers will require about 10K of memory. Most (arduino) mcus only have 1 to 2k of memory, so even though the syntax of the C programming language allows you to index 5,000 or more elements in an array, there is simply not enough space to store it. Also, don't forget that other stuff goes into memory over and above your array including other variables you declare, the stack and other things. For whatever it is worth, the Mega 2560 has an XMEM interface specification that allows you to add pretty much any amount of memory in banks of 64KB, so if you used that, which requires external hardware, then you would be able to store your 5,000 elements. What is it that you are trying to achieve? Perhaps there is an alternative way to achieve your goal... More on reddit.com
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June 28, 2022Arduino Tutorials: Value Ranges of Arduino Variables - YouTube
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Mastering the Integer Data Type in Arduino: A Comprehensive Tutorial ...
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Arduino data types - (Arduino Uno Programming for Beginners) - YouTube
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How to Use Data Types in Arduino Programs - Ultimate Guide to the ...
TutorialsPoint
tutorialspoint.com › arduino › arduino_data_types.htm
Arduino - Data Types
This yields a range of -32,768 to 32,767 (minimum value of -2^15 and a maximum value of (2^15) - 1). The int size varies from board to board. On the Arduino Due, for example, an int stores a 32-bit (4-byte) value.
Code-reference
code-reference.com › arduino › data_types › int
arduino data_types int Programming | Library | Reference - Code-Reference.com
February 16, 2024 - 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).
Arduino
cdn.arduino.cc › reference › en › language › variables › data-types › int
Arduino Reference
March 9, 2023 - 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). On the Arduino Due and SAMD based boards (like MKR1000 and Zero), an int stores a 32-bit (4-byte) value.
Arduino Forum
forum.arduino.cc › projects › programming
Is it possible to set a variable to a range of values? PID TVC Attempt - Programming - Arduino Forum
December 29, 2020 - Hi All, I wanted to know if it's possible to set a variable to a range or any value between two values. Here's a brief reason as to why I'm attempting this in case there is a better way for me to go about things. I'm …
The Robotics Back-End
roboticsbackend.com › home › arduino variable types [complete guide]
Arduino Variable Types [Complete Guide] - The Robotics Back-End
September 28, 2021 - Thus, pay attention not to use too big numbers with int. On boards such as Arduino Due and Zero, integers store 4 bytes, so the value range is much higher: -2,147,483,648 to 2,147,483,647.
Blogger
mbedgeek.blogspot.com › 2018 › 12 › data-types-in-arduino.html
Electronics and Embedded Systems, Microcontrollers, Arduino: Data Types in Arduino
Integer is the most used data type in Arduino. In ATmega based arduino board (Uno, Mega, Nano etc) 'int' uses 2 byte of memory and as a range of -32,768 to +32,767.
Assiss
assiss.github.io › arduino-zhcn › cn › Reference › Int.html
Arduino - Int
This yields a range of -32,768 to 32,767 (minimum value of -2^15 and a maximum value of (2^15) - 1). Int's store negative numbers with a technique called 2's complement math. The highest bit, sometimes refered to as the "sign" bit, flags the number as a negative number.
SparkFun Learn
learn.sparkfun.com › tutorials › data-types-in-arduino › all
Data Types in Arduino - SparkFun Learn
Most times, that's going to be limited to giving users feedback about something which is fairly meaningless as an arbitrary integer value: the ADC will return a value like 536, which is cryptic, but converted into floating point it would be something like 2.62V, which is much more useful.
Reddit
reddit.com › r/arduino › q: why is " a0 " a int type ?
r/arduino on Reddit: Q: Why is " A0 " a int type ?
August 4, 2021 -
Hello, i'm just starting in the arduino world, also in the C world ( I only know a little bit of Python )
I'm in the 3 project of the official starter kit book ( in spanish ). They start with the constants, and the code they write is this:
const int sensorPin = A0;
constants are variables that can not change, OK.
const is for declaring a constant, OK.
int is for declaring the type of the data stored in the constant, OK
sensorPin is the name of the constant, OK
= is to assign the value, OK
A0 is the value of the constant , mmmmmm
; this is for telling that is the end of the constant, OK
As far as I know a " A0 " is not a integer, in the Arduino UNO a integers are a range of -32,768 to 32,767 (16-bit) ( int - Arduino Reference ).
So my question is why const int sensorPin = A0; don't give me an error if A0 is not a int ?
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A0 is just the name of another constant int defined in another file. So your statement says create a constant int and give it the value of the constant unsigned int called A0. Not that an unsigned int can be put into a signed (int) if its value is not greater than the positive range of the int. A0 is actually contains the value 14. It could easily have been called DAVE99 or AHMED_SMITH. But obviously it wasn't as A0 was what the Arduino team wanted to label the first analogue pin (pin 14) Here is the definition #define PIN_A0 (14) #define PIN_A1 (15) #define PIN_A2 (16) #define PIN_A3 (17) #define PIN_A4 (18) #define PIN_A5 (19) #define PIN_A6 (20) #define PIN_A7 (21) static const uint8_t A0 = PIN_A0; static const uint8_t A1 = PIN_A1; static const uint8_t A2 = PIN_A2; static const uint8_t A3 = PIN_A3; static const uint8_t A4 = PIN_A4; static const uint8_t A5 = PIN_A5; static const uint8_t A6 = PIN_A6; static const uint8_t A7 = PIN_A7; A define is just a const into defined in the preprocessor (the runs before the compiler). See here https://forum.arduino.cc/t/using-a-variable-to-store-an-analog-pin-number/525930/2
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It all begins with the fact that registers are assigned by their number. A0, is already included as part of the hardware's header file. It was assigned a value that inside the arduino is recognized as the location where the pin is controlled. You have a value for each of the pins in this fashion. Thanks to the developers of Arduino, the Arduino IDE, and that of AVR architecture, you have a number of ways to address pins (pun intended lol). You may find that just passing a random number to pin function calls will address random pins. Most AVR chips address the pins in pinout order counter clockwise from the dot. Arduino then adds the ability to address them by name "A0" with the hardware header by assigning the pin value to that name as a constant. Finally, yes, it doesn't have to be an integer. In fact, if you would rather use bytes, there are lessons in register manipulation that will help you get a deeper understanding yet. The pin value being a single bit of the register's value, it overflows to the next register giving the address to that register's pins. Imagine all of the registers lines up like a piano keyboard and your pin number is the number of keys from the right that is counted before pushing the key down.
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It's easy enough to find out for yourself:
Serial.println(sizeof(int));
Serial.println(sizeof(long));
Serial.println(sizeof(unsigned int));
Serial.println(sizeof(unsigned long));
Serial.println(sizeof(uint32_t));
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They all report 4, which I take to be 4 bytes, 32 bits
This implies int and long are identical as data types on R4, and probably any other Arduino with 32 bit processor, right?
Seems the only reason to keep separating int from long variables is backward compatibility.
Arduino
docs.arduino.cc › language-reference › en › variables › data-types › unsignedInt
unsigned int | Arduino Documentation
Instead of storing negative numbers however they only store positive values, yielding a useful range of 0 to 65,535 ((2^16) - 1). The Due stores a 4 byte (32-bit) value, ranging from 0 to 4,294,967,295 (2^32 - 1). The difference between unsigned ints and (signed) ints, lies in the way the highest ...
Reddit
reddit.com › r/arduino › how many integers can be stored in the array function at a time in arduino uno? can i store around 5000 integers in a single array variable?
r/arduino on Reddit: How many integers can be stored in the Array function at a time in Arduino Uno? can I store around 5000 integers in a single array variable?
June 28, 2022 - Depending on the size of your program this could give you room for potentially 13,000 integers (approximately, assuming your program and the bootloader used ~6K of program space. Completely depends on what room you have left) See here if that ...
Reddit
reddit.com › r/arduino › how do i add a range for integer b to be greater than or equal to 75 and less than or equal to 90? trying on tinkercad but it isn't working. however b>75 works on its own.
r/arduino on Reddit: how do I add a range for integer b to be greater than or equal to 75 and less than or equal to 90? Trying on TinkerCAD but it isn't working. However b>75 works on its own.
December 2, 2021 - First foray into using bare metal microcontrollers - using the ATMega328p from an Arduino Uno.
Adafruit
learn.adafruit.com › deciphering-strange-arduino-code › stdint
stdint | Deciphering Strange Arduino Code | Adafruit Learning System
August 10, 2022 - For example, on the Arduino UNO and similar, int (and cousin unsigned int) are 16-bit values…two bytes in RAM…with a range from −32,768 to 32,767 (or 0 to 65,535 for the unsigned variant).
Arduino Getting Started
arduinogetstarted.com › reference › arduino-int
int | Arduino Getting Started
April 23, 2026 - 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).
Seeed Studio
seeedstudio.com › home › getting started with arduino data types
Getting started with Arduino Data Types - Latest News from Seeed Studio
May 29, 2020 - Do note that int size varies from board to board. For example, in ATmega based Arduino boards like the Uno, Mega and Nano, an int uses 2 byte of memory and as a range of -32,768 to +32,767.
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On the Arduino (AVR models) an int is 16 bits, not 32 bits. Thus it goes from -32768 to +32767.
That is different from long which is 32 bits.
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According to the C language specification, int must be at least 16 bits or longer and long must be at least 32 bits or longer.
It is OK for a compiler to implement int as 32 bits or even 64 bits. It is OK for a compiler to implement long as 64 bits or longer. But it is not allowed for a compiler to implement long as 16 bits.
So when to use which type?
If the values you will be working with can be represented within 16 bits then it's OK to use int. If you need more than 16 bits use long. If you need more than 32 bits use long long.
Do not be caught up with compiler and/or CPU specifics. As mentioned by others, even within the same product range, Arduinos, there are 16 and 32 bit CPUs available. Instead, only trust what the standard guarantees.
The full specification of types in C are:
charmust be at least 8 bitsintmust be at least 16 bitslongmust be at least 32 bitslong longmust be at least 64 bits
Note: It is perfectly legal for compilers to implement char, int, long and long long as 64 bits. This is in fact not uncommon among DSPs.