Automation of the Farfisa EX326 uniphone using a voltage-free Sonoff module

Good morning,

I would like to ask for help in automating a Farfisa brand digital uniphone model EX362.

I have already read other forum posts and material on the internet, but I still have doubts.

My goal is to add the ability to automatically open the entrance gate using the Sonoff module.

I live on a housing estate of detached houses with a common entrance gate, each house has an internal intercom installation consisting of one digital video intercom and two uniphones. The gate is opened with the uniphone by pressing the key for a long time, without lifting the uniphone handset or receiving a call.

After dismantling one of the uni phones, it turned out that I have a 4-core installation, 2 cables supply voltage to the uni phone (30 V DC, LM inputs), while the other two are probably used to control the gate, wicket and for voice transmission.

My questions:

1) In this type of installation, is it possible to connect the Sonoff with a voltage-free output so that it mimics the short circuit I make with the button?
2) Will a Sonoff DC switch be ok - I mean a voltage free version on the output:



I am attaching overview pictures.

Thank you very much for your help
.

It will work. I have a similar solution.

Good news, and could you describe exactly how you connected it/attach some overview photos? I'm particularly interested in how to connect with the non-network output to this button

I would be very grateful .

piotrb45 wrote:

.
After taking apart one of the uniphones, it turned out that I have a 4-wire installation, 2 cables supply voltage to the uniphone (30 V DC, LM inputs), while the other two are probably used to control the gate, wicket and for voice transmission.

.

The LM is the bus that takes care of everything (talking, video, opening), and the extra wires could be for example the entrance door bell (A1, GN), which is not what you think.
The picture of the uniphone shows only the bus.

To make the opening from an additional source (e.g. sonof), you have to interfere with the uniphone board, only whether it is worth it, because the warranty will rather run away with it.

Regards

I'm already out of warranty, so that's why I'm considering modifications....

I have a question a isn't it possible to just plug in these LM wires and short them like this button does?

piotrb45 wrote:

isn't it possible to just plug in these LM wires and short them like this button does?

.

No, because the button doesn't make a short circuit on the LM wires, it just gives a signal over the bus --> "opening".

Greetings

Another question is whether it would be possible to use the voltage from the LM to power the Sonof? How would it need to be plugged in?

piotrb45 wrote:

Another question is whether it would be possible to use the voltage from the LM to power the Sonofa?

No

piotrb45 wrote:

No.
How would it need to be plugged in?

Separate power supply.

Greetings

As far as I remember, I have NO and COM contacts connected to the button that is used to open the gate. I have a separate power supply.