GPIO is an acronym that can contain many meanings which are listed below.
GPIO – General Purpose Input Output
There may be many popular meanings for GPIO with the most popular definition being that of General Purpose Input Output
More GPIO Definitions
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GPIO (General Purpose Input/Output), or Bus Expander, products allow easy serial expansion of I/O through an industry-standard I²C, SMBus™, or SPI™ interface. GPIO products can provide additional control and monitoring when the microcontroller or chipset has insufficient I/O ports, or in systems where serial communication and control from a remote location is advantageous.
Each GPIO port can be individually configured through software as either an input or output.