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This page is a translated version of the page GPIO and the translation is 100% complete.
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GPIO (General-purpose input/output) is the electrical circuit contact to which the user can output a value (logical 1 or 0), or receive a value from it. Despite the common name, the logical 1 may appear as different voltage - watch this.

Managing GPIO on Linux

See See also deprecated manual Managing GPIO

GPIO on Wiren Board