Hi folks, I could realy need some help on a project I want to do in the future.
I live in an apartment with an ancient door phone/intercom system, I essentially want to replace the door phone with a tablet like raspberry pi 3 setup and a nice UI frontend, retaining all the functions of the door phone, ie. doorbell, unlock the front door, and possible talking to the person on the outside.
The problem is that I don’t know anything about how the system works, other then it must be a simple analog system, however I don’t want to end up doing any harm in the process.
I found this schematic for my exsisting door phone (its a Siedle HTA 711), maybe somebody can help me understand if its even possible to connect to a pi’s GPIO?
It shouldn’t be that hard but will require a little soldering and the destruction that causes. The diagram show screws so you might just attach the wires to those screws. I would add a wire to each side of every switch to a relay and the relay to my pi. This would just simulates you pressing the button and closing the circuit. For the audio, I would try to solder the mic wires to a mini plug and put that into the pi to see if I could hear it.
To be honest, I think I would leave the out the audio as in practice it don’t think it would be usable or audible.
Thanks @RobDYI I might clarify that I intent to remove the door phone completely as it is old, ugly and in the perfect position for the PI Tablet.
How do you understand the wiring for the doorbell function? I’m a complete noob when it comes to understanding wiring and it makes no sense to me how that part works.
Did you figure this out? I need to do same and hack my door intercom. I know which two wires to trip. But I need something that connects to HA and capable to simulate a button press release . Any ideas?
Not yet, I don’t feel to confident messing with it yet, but my plan is to just connect it directly to a PI, using some of the signal pins sending it to HA over MQTT, I also think you can use an arduino.
Your system is called 4+n. It is fully analog system with 9VDC signal and 12VAC power supply.
The contacts in your phone are as following:
1 - door lock (12VAC to open, NO contact)
12- phone mic
9/c- common ground
11 - phone loudspeaker
6 - call wire (12VAC from b contact? to call the buzzer). Not common system for me to handle but i remember I managed to triger the call by short circuit either 6-11, 6-b, 6-7 or 7-11. Try nothing to loose the equipment is strong enough to survive shortcircuits for the short time.
I hope this will help you somehow.
Those are major wires in the system. Since HTA-711 has chime bell (never seen it live but believe it has) you can ignore contacts like 10, 12, G. They are to power chime.
Contacts To, Li are usually used to open the gates/doors using phone buttons.
Sorry for hijacking this thread but is there anyone who knows if I might be able to make my intercom system smarter? I.e. opening the front gate from the HA app.
It’s a BTicino Sprint L2. The system uses only 2 wires, for both way audio and somehow opening a door relay. I hooked up a voltmeter to the 2 wires and there seems to be 28V AC tension on the 2 wires.
I have the same headset and was planning of integrating it using an esp device with solid state relay (flat). To power it I would use a Mini360 DC Converter.
Hi! Did you have any luck with your project? I have exactly the same goal in mind - I wish to replace very similar old door phone with something simple. I was thinking arduino with a speaker, mic and two buttons, but I am more of a software guy so I barely understand the basics. Any help would be appreciated!
The author sells raspberry pi hats that implement a protocol sniffer that lets you listen to and inject messages into the bus. Its not foe beginners, but it works.
@grinco I notice your link to the espscsgate device is different from the raspberry pi hat being sold on eBay, is there a reason why you chose the espscsgate instead of the raspberry pi hat? I can’t find any links to the espscsgate on eBay, do you know if the author is still selling this?
How has your experience been interfacing the espscsgate with home assistant? What functionality have you been able to control on your Bticino intercom unit? Do you have any advice on how to get this working with a Bticino 344242? Thanks!
Edit: I just noticed on the news section of the espscsgate author’s site, that he’s no longer producing the ESP version, and it looks like the raspberry pi hat is the preferred method now:
Feb 28, 2023 - scs/knx gate - I abandoned the ESP version due to the unreliability of these modules. Some always work, others last a few years (or a few months) and then break. The raspberry version, on the other hand, always works fine. The only problem is that raspberry is nowhere to be found. So I tried with orange pi/pc and also with “nanopi” - it works very well. I will update the manual. I also put the pcb (printed circuit board) up for sale on ebay for anyone who wants to build it themselves.
This is correct. I was in contact with the author and he said the esp version had hardware stability issues and he provided me a PDF guide (in Italian) on using the RPI one and the link to eBay. It works flawlessly, and I haven’t had a single issue since I started using it a while ago. IIRC there was an scsgate integration in HA, but I haven’t tried that one since my HA is running on a different machine.
Thanks for the quick response! I’ve just discovered the Ring Intercom and it’s on special for £37.99, so I’m gonna give that a try first and if it doesn’t work, I’ll pick up the RPI hat.
Did the Ring Intercom works with the Bticino 344242?
On the Ring website it does not appear in the list of compatible models, but if you search for the port configuration that it is an SCS port it seems that it is compatible.
