frank prism
For now, it is used simply to open the building doors for me. Relays ensure it is completely insulated from the intercom circuit when not in use.
A future plan is to upgrade to an ESP32 and use the ADC and DAC to allow for remote audio streaming, like a VoIP phone.
bronze glade
How does the communication work on this door phone? Do you have some documentation for it? I'm struggling with Polish Elfon. Where manufacturer don't want to give any details. Managed to decode the call preamble with device address. I used the 6n137-L to separate the circuit and be able to capture the very short pulses of the signals.
frank prism
This intercom is very old and very much analogue.
The door switch in this case is just a pair of normally-open physical switches, that are contacted by the relays on activation.
I have brought out the signals for earpiece and microphone, but they are unused as of yet.
fathom pewter
Does the future plan call for consolidation and a project box? I will say, seeing projects hot glued to walls isn't new but, you took it to the next level and put it in a picture frame on the wall!
frank prism
Honestly if I could find a way to leech power from the lines without disturbing the system, I'd put everything inside the intercom shell itself. So no box.
I think as long as it has to take in external power, and I don't feel like this thing is done, I'll keep it framed on the wall like that. A nice conversation starter 🙂
cursive quiver
I have a system like that, and I can promise you: there is no way to leech power in the top unit without disturbing the audio system of all users. I tried all possible methods, but the power delivery box in the basement is very old and not made to power anything else than a ringer and a voice system.
can you measure what voltage it runs on? mine uses 9V AC for the ringer and door opener, and 9vDC for the voice system.
I also have a ringer detection system on mine. simple rectifier+3.3v regulator+capacitor setup, with a bit of debouncing in-software.
vague wren
Why my interphone have only two wires I tried to make an opener but it didn't work
frank prism
I've read around 6V for the voice lines, and around 3V for the door opener switch. There is hardware for the ringer but it is disconnected, instead, my building has wired the regular doorbells to the button panel on the street.
frank prism
Why my interphone have only two wires I tried to make an opener but it didn't wo...
It's probably a newer, digital system that uses the same wires for power and data. It helps to figure out what signaling protocol your system is using.
vague wren
It's probably a newer, digital system that uses the same wires for power and dat...
I found that to open the door I have to touch the two wires together for like 0.5s but before that I have to ring the doorbell from the front door and this is bad because I don't want to ring it if I just want to open the door for myself
bronze glade
I found that to open the door I have to touch the two wires together for like 0....
In system i have it is impossible to open doors before the phone is called
vague wren
In system i have it is impossible to open doors before the phone is called
Yes I have to modify the ring somehow so it dosent make sound if I'm home or smth like that
vague wren
I can just link the bell to a relay module linked to the esp32 and when in want to open the door without ringing the bell I turn off the relay so the bell don't ring and then I press the button and I open the door by pressing a button on home assistant so it connects the two wires together and then I reactivate the relay to activate the ring