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GPIO stands for General Purpose Input Output and can be used to receive and send digital signals to and from simple electronics from the Raspberry Pi.

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Prevent wake-from-halt

The entry for gpio-poweroff states: Name: gpio-poweroff Info: Drives a GPIO high or low on poweroff (including halt). … Load: dtoverlay=gpio-poweroff,<param>=<val> Params: gpiopin GPIO for signalling (default 26) active_low Set if the power control device requires a …
Philip Cook's user avatar