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Use of 2x20 pin connector on single-board computers

DragonPeti
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Lately, I was wondering what is the use of those 2x20 pin connectors that you can find on single-board computers like Raspberry Pi, Orange Pi, Arduino, etc. What can I connect to those?

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GPIO. Almost anything, RPI compatible devices have many communication protocols that use some of the GPIO pins.

https://en.wikipedia.org/wiki/General-purpose_input/output#Board-level_GPIOs

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