What is modern electrical wiring in a house? Practical example...

Mailbox

Push notification when the mail is delivered? very cool!

Yes and message in the house on the display in the entrance area.

Yep, and notification in the house on the display in the entrance area.

I would be very happy if you could describe your solution in more detail, how you solved it in the mailbox.

I would be very happy if you could describe your solution in more detail, how you solved it in the mailbox.

I think using a reed switch on a binary input. Possibly even with two, one for the slot insertion (as soon as state changes => mail present) and one for the opening door (state change => emptied).

Well, there are two ways.

1. Simply just a reed switch on the flap, since often the notification that the flap has been opened is enough. In 99% of cases, there is something inside. As Leo describes it with 2 switches, it is even more convenient.

2. However, I have an optical barrier solution, because then a notification only occurs in 100% of cases; as soon as the optical barrier is free again, the notification disappears.

Well, not in every socket but in each socket group one. In this sense, you then go with one cable into the room, lay it continuously from one socket group to the other in one piece, and then either go to the next room or finish and repeat the whole thing in the other room with a new run.

Okay, that's how I understood it, simply run the bus cable parallel to the 5x1.5 power cable and leave 10-20 cm of cable spare per socket group.