This device does not simply shorts the wire anymore, it probably sends a signal (or shorts a pin) and I was wondering if someone has ever deal with it. I saw other posts that are not that far away, but did not get responses:
Since the buttons are physical, I could ultimately look at making the “press” close to the button but if someone has had any more lunch I would be delighted to learn from your successes
Looking at the PDF… GT XI and Y1 are your connections for the buttons and CP is for the intercom at the entrance side whist S- and S+ are the ringer leaving Line for circuit:
Thanks. I will have to measure that because I am not sure that shorting CP is enough to trigger the opening of the door (I have a bad feeling that this will be a composite signal, not just a shorting)
I am considering either trying to dismantle the box to get to the buttons as @Hellis81 suggested, or to build a mechanical contraption that will press the buttons.
I would prefer solution 1 but I need to take some time to carefully unscrew the device and even more carefully solder around with the bix hanging on the wall
I did not have the time yet to do that - I would be glad to know what you found out when opening the device. Would you mind taking a picture once it is opened? (I do not have the screen but I gues that just an extra signal and the opening is managed the same for all systems)
Finally had a look at this. Not good news. PCB button pad wiring is the only hope, unless we reverse engineer the whole 2voice system and tap into the BUS lines.
I have a Urmet 1702 with video and I would like to integrate this in my Home Assistant server, I never used a ESP module, but I have done many other nice things, however, does anyone know if this can be done and what kind of ESP I have to buy?
The problem with this device is that it uses a specific modulated signal to do stuff (in my case opening the door). It is not a matter to just short cables (as it was the case in my previous system).
So either you have to measure these signals and replay them (this is out of my league but should be doable for someone knowledgeable - there is no rotation of codes or anyhing like that), or go the dumb way like me and design a mechanical “presser” that will both react to Home Assistant and have mechanical buttons that will trigger the mechanism. This is WIP, I restarted it literally yesterday after an idea of my father about how to design the mechanical part. I will opensource it once it is done (the 3dprinting models, the hw and the sw)
No, I mean that the “open the door” message is not simply a shortcut on the active wire(*) but it is a true code sent from client intercom to the manager via a bus. If you shortcut the wires the whole system crashes and will reboot (don’t do it :)).
It means that you need to measure the signal when you press the “open door” button and extract the code if you want to replay it to the manager.
In the case of my intercom it is even worse: I need to first click on the “spek” button, then on the “open door” one, and again on the “speak” button. This means that I simply cannot just open the door by pressing the relevant button. Worse: I cannot press speak, door, speak without someone first initiating the service by calling my apparemment. This is a piece of crap.
(*) which is typically the case for simple intercoms, and you usually get a bunch of wires out of which only 2 or 3 are actually used – but this depends on plenty of things
Namely the Urmet MIOR 2Voice 1183/7
