iButton contact pad design

iButton 1-Wire
#1

We need a contact pad that can work both as reader (1-wire master) and slave as a key. For this purpose we need a custom design contact pad. The main problem is that our design allows user to put key in wrong polarity. I believe that we can somehow find a shape that allows only one correct polarity for both modes.

Here is the 1-wire master mode
You still can switch key to the opposite side and lean it wrong side

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Here is the 1-wire slave mode for key emulation
In this mode you have less chance of mistake but it still possible to switch polarity.

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Original iButton contact pad have no chance to user mistake. I believe we can do the same contact pad design. Your suggestion is welcome.

#2

What will happen if the polarity is switched? Will it notify or something?

Also, while I am not much familiar with 1wire tech specs, I think I heard of master keys that somewhat exists for a variety of intercoms. Will there be any of them predefined or I am obliged to scan the key first to use it to open things?

The design is ok by me (you could make a retractable part of a more convenient form but as I understood the absence of moving parts is one of the goals)

1 Like
#5

Как на счет продавливающегося внутрь цилиндра с пружиной?

#6

Уже ооочень поздно, мы уже всё давно сделали

#7