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constants: variables in arduino programming (part 1)
This article details the types of constants in Arduino programming Overview They are predefined expressions in the Arduino language, used to make the sketch easier to read. HIGH | LOW As you may have read in the Digital Functions articles, when reading or writing to a digital pin, there are only two possible values a pin can take: HIGH and LOW. The meaning of HIGH and LOW depends on whether the pin is declared as an INPUT or an OUTPUT. Visit the articles on digital functions