Subj : Re: RP2040 reset idea
To   : john larkin
From : Theo
Date : Tue Sep 17 2024 16:42:36

XPost: sci.electronics.design

In comp.sys.raspberry-pi john larkin <JL@gct.com> wrote:
> Some of my customers also want to lock a box such that it's impossible
> to write to any nonvolatile memory while it's in a secure area.
>
> So here's an idea: a small hole in the box allows a toothpick or a
> paper clip to push a button. A short push is a regular reset. A long
> push is a memory-stick mode boot. We can have a rotary switch LOCK
> hole too.
>
> https://www.dropbox.com/scl/fi/bbhdy053xsdzv77g0brc5/B-box_Reset_Button_3.jpg?rlkey=40ozzdvczf4z8625u8i081a9b&raw=1

Looks neat.  But I wonder if there's a mechanical solution.  eg give the
customer a loop to put a padlock through to lock the lid, and hide the boot
button behind, such that they can't press it without undoing the
padlock.  Could even be something simple like a Kensington lock slot where
the boot button is deeply recessed in the slot - you have to stick a
screwdriver in the slot and can't do so if there's a lock inserted.

Of course that might cost more than your solution, so you can probably
ignore me :)

Theo

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