![]() unsigned char (8 bit) - same as 'byte' if this is what you're after, you should use 'byte' instead, for reasons of clarity.The compiler will attempt to interpret this data type as a character in some circumstances, which may yield unexpected results char (8 bit) - signed number from -128 to 127.byte (8 bit) - unsigned number from 0-255.boolean (8 bit) - simple logical true/false.Note: signed variables allow both positive and negative numbers, while unsigned variables allow only positive values. ![]() C++ defines a number of different data types here we'll talk only about those used in Arduino with an emphasis on traps awaiting the unwary Arduino programmer.īelow is a list of the data types commonly seen in Arduino, with the memory size of each in parentheses after the type name. The Arduino environment is really just C++ with library support and built-in assumptions about the target environment to simplify the coding process. You may want to familiarize yourself with a few concepts before we get started: This tutorial will cover the basic data types available in Arduino, what they're typically used for, and will highlight the effects of using different data types on the size and performance speed of your programs. And sometimes it seems like it should be easy, but it turns out to yield results you might not anticipate. The compiler, then, is left trying to figure out what I mean when I say "add this integer to that floating point." Sometimes that's easy, but sometimes it's not. You, the programmer, tell the compiler that this value is an integer and that value is a floating point number. The ALU doesn't care what that data represents to a user, be it text, integer values, floating point values, or even part of the program code.Īll of the context for these operations comes from the compiler, and the directions for the context get to the compiler from the user. At their core, the heart of the device is an arithmetic-logic unit (ALU), which performs (fairly) simple operations on locations in memory: R1+R2, R3*R7, R4&R5, etc. Computers, including the Arduino, tend to be highly data agnostic.
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