https://code-reference.com/ 2026-05-18T17:39:50+02:00 https://code-reference.com/ https://code-reference.com/ttps://code-reference.com/lib/tpl/dokuwiki/images/favicon.ico text/html 2013-02-15T20:49:14+02:00 https://code-reference.com/arduino/constants/constants?rev=1360957754&do=diff Constants are predefined variables in the Arduino language. They are used to make the programs easier to read. We classify constants in groups. Defining Logical Levels, true and false (Boolean Constants) There are two constants used to represent truth and falsity in the Arduino language: true, and false. text/html 2024-02-16T01:04:16+02:00 https://code-reference.com/arduino/constants/fpconstants?rev=1708041856&do=diff Similar to integer constants, floating point constants are used to make code more readable. Floating point constants are swapped at compile time for the value to which the expression evaluates. Examples: n = .005; Floating point constants can also be expressed in a variety of scientific notation. 'E' and 'e' are both accepted as valid exponent indicators. text/html 2024-02-16T01:04:16+02:00 https://code-reference.com/arduino/constants/integerconstants?rev=1708041856&do=diff Integer constants are numbers used directly in a sketch, like 123. By default, these numbers are treated as int's but you can change this with the U and L modifiers (see below). Normally, integer constants are treated as base 10 (decimal) integers, but special notation (formatters) may be used to enter numbers in other bases. text/html 2024-02-16T01:04:16+02:00 https://code-reference.com/arduino/constants/progmem?rev=1708041856&do=diff Store data in flash (program) memory instead of SRAM. There's a description of the various types of memory available on an Arduino board. The PROGMEM keyword is a variable modifier, it should be used only with the datatypes defined in pgmspace.h. It tells the compiler “put this information into flash memory”, instead of into SRAM, where it would normally go.