Talking of control panels for doors,
let's have a quick look at some examples that you may also come
across in your assessments. It is unlikely you will ever
discover a decent PIN access code system.
Often they are highly worn out, like the one pictured.
It is important to understand that these codes are
often not set up to be secure.
After all,
how secure can a four‑digit code be? It is often
meant to be usable by the employees.
The other major fault with this particular system is that
it is secured using a standard screw.
This is very easy to undo and bypass the internal
wiring system to obtain access.
Do not attempt to do this without an understanding of electric circuits as
you could be shocked or killed by high voltage current.