alan_m wrote:
On 08/02/2019 10:00, Chris Green wrote:

I've actually come the conclusion that an 'ordinary' mechanical button
operated lock this like this will work fine:-

https://www.screwfix.com/p/codelocks...ton-lock/4103t


NOT applicable for your application but those type of locks can be very
insecure as well.

They may have 4 digit combination but often it doesn't matter in which
order you press the 4 number buttons. Unless the code is changed
regularly or the buttons are regularly cleaned it can become obvious
which 4 buttons are being used.

They are all 'non-sequential' as they call it, but most do have more
than just the 0-9 buttons, they have a couple of letters that can be
part of the combination too. Our stable door one is stainless steel
finish and, even after quite a few years, doesn't really show which
buttons have been used most.

So, not *very* secure no, I quite agree, but adequate for what I want.

As an aside our garage electronic push button keypads are much worse
as regards showing which buttons have been used, it's very obvious.
The only saving grace is that the code is unique and has to be entered
exactly as the right number.

--
Chris Green
·