I am new to Home Assistant and have managed to learn and implement quite a bit in the last few days.
I live in an apartment and we all have a video intercom system, with the main doorbell and camera (only at the main entrance) and just the doorbell at our front doors.
When someone rings the bell at the main entrance, the video feed on our intercoms turns on and then we have 2 buttons on the intercom - one to speak to the visitor and the other one to buzz them in.
Once at the door, they can ring the bell again, but at that point we just get the tone on the intercom and we can just open the door.
I’d like to know if there’s a way to smartify the intercom, so it can do the following:
Send a notification to my phone.
Video feed / still image would be nice.
Ability to talk to / buzz the visitor in.
If nothing else, at least the notifications would be nice to begin with.
I’ve gone through Frenck’s instructions:
… but I’m not certain if this will work in my case. I’ve checked my intercom (Evercom DM2) and it has 4 wires at the back and that’s what’s got me confused. Image at the end (new user can only add one image).
I don’t know anything about electronics but I don’t mind learning and trying new things with these ESP32 chips.
Tough problem. Googling the model number there are some manuals with additional data, albeit in Dutch which I do not speak, but the drawings suggest that your green and yellow wires are a bus line, while the white and dark-green wires are power and ground, respectively. The bus line appears to interconnect multiple devices, including what appears to be a separate box elsewhere on the bus that triggers a relay to open the door.
Unfortunately I don’t see a lot of clues as to what bus protocol it’s using, but knowing it’s two wires it could be a rs232 modbus or CAN bus standard, or possibly something entirely proprietary. On the plus side, esphome supports both those standards, but unless you have experience reverse engineering line protocols this could be quite a daunting challenge.
I found a esp32 project that is compatible with some other brands, which you could try optimistically, but which should also give you an idea as to the scope of what is required.
Appreciate your input. Yeah, the bus line splits across multiple floors and there’s one central relay (could be two) for the door opener. I don’t know anything about reverse engineering protocols… is this related to getting the audio / video feed from the system?
The Doorman seems like a viable option, if it works. I’ve got in touch with Flo regarding this.
In case it doesn’t pan out, do you reckon I could at least get notifications on my phone using a Shelly 1 or something with the bus lines?
