Just use a simple 10A relay with 5V coil
As a latch, you press a button to power up, ie power the coil, then the
same line gets dropped by the Pi to power off..

https://www.digikey.co.za/en/products/detail/omron-electronics-inc-emc-div/G5Q-1A4-DC5/1815721


On Wed, 16 Feb 2022 at 00:00, Thaddeus Waldner <thadw...@gmail.com> wrote:

>
> > Youu need a human to somehow
> > kick-start the process.  But it should be automated after that.  Of
> course
> > the computer *can* turn itself off.
> >
> > I've managed to put the "on" button on a phone or indoor PC.
> >
> …
>
> This is the part that won’t work. The machine is small enough to pick up
> and carry off. It will be used in a construction environment without
> dependable wifi. It will have multiple users. I think it should have a
> power button or switch.
>
> Thanks for the idea anyway… I’ve seen those smart plugs but it didn’t
> occur to me to have a computer operate them.
>
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