Hi Barry,
Raspberry Pi design did not include a built-in mechanism to detect operating system "halt" or "poweroff" commands and then disconnect electrical power after OS shuts down, nor does it include a power switch on the board.
It can be done but requires custom coding and some electronics (relay) to disconnect power from the board, then a physical switch on the board/exclosure to reconnect power to the board so it can boot.
Something like that :-)
Regards,
Tim




Originally Posted by Kit1cat

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