I'm totally new here and electronics are not my stronghold, i just have some basics that stayed from college.
That said, i am actually trying to put in place home automation in my flat and i already can find lots of products wich suits my needs for everything. Everything? wait, no, there's still one thing missing:
I want to be able to open the entrance door of the flat i live in without my keys, directly from my phone.
I searched long time. Custom build network operable relays are quite expensive, between 150$ to 300$ depending on the store and capabilities (wifi, ethernet).
But while searching this i found quite a list of related project based on Arduino or Pi, and even read about teleduino.
So here i am asking for guidance.
I've attached the picture of the intercom inners, I'm actually waiting information on the +12v input and the Door outgoing cable.
I sorry, i don't have schematics. I basically need to make an "on/off" switch between the two "OP" terms. if i link these too, the door open.
I live in an appartement at the 8th floor of a flat, this picture is the internal of a standard 5 wire intercom to receive call from the ground floor entrance and open the door.
Opening the door mean connecting the 2 "OP" terms. there is a switch for that on the intercom.
What i want to do is not a replacement to the existing intercom but an add on, a second circuit wich would be able to activate or close the connection between the 2 "OP" lines. And no there is no remote actually. just someone ring, i go, say hi and press button to open them, and when it's me who is downstair, i have to use the key, but i don't want to use the key, that's the point
I want it to be operable by phone, after, i don't know yet the level of security but i guess if it is web based, an access via a web page or web app protected by password. but first i need to know what can be made at least to do this from a local network, after, i'll make what is necessary to give access from wan and make it secure.
I agree with Robin2. The photo is not very useful.
However because you posted what you are calling the "intercom inners", I presume this photo is of the intercom device hanging on the wall inside of your apartment (flat).
Furthermore, I am assuming that intercom system has a button that you can press which "buzzes" the door open, like when you are receiving guests.
So I am assuming that the door already has a remote means (via intercom "buzz" button) to open the door.
Additionally your subject of this post "Close/open a 12v current remotely" imples that you need a way of essentially "pushing" the button on your intercom to open the door.
I'm still assuming a lot here, but if my assumptions are correct, you will want a basic arduino (Uno perhaps), with a Wi-Fi or an ethernet shield. You would also want a relay shield or a circuit (transistor controlled relay). You will want to wire the RELAY in parallel with the "buzz switch" that activates the door opener.
You could then program the arduino as a web server. You could then log onto it outside of your apartment with a web browser on your smart phone, and activate the RELAY to "buzz" you in.
Setting up the arduino as a webserver requires some complexity like "port forwarding" from your router and could be complicated if the router is not your own and if you cannot access its configuration.
Instead of a web server, you could setup the arduino as a web client (no port forwarding required). the arduino could then connect with an (IoT) Internet of Things website (I use Xively), where it could look for a command placed there by you on your smart phone to open the door. I have done this sort of thing for light control (not door) using an arduino Uno set up both ways as a web server or client.
I hope this helps and good luck with your project.
Another option might be a system for the Arduino to receive an SMS message from your phone.
I did not realize from your earlier post that you wanted to open the public door to your apartment building. Have you checked whether your landlord and the other tenants might object? Would it be acceptable to the apartment's insurers?
Whatever system you devise will need a high level of security. For example a thief is far more like to steal your phone than your key simply because it would be easy to sell the phone. And your phone may well have information in it that would identify your apartment building. Whereas a key is anonymous.
It seems to me it would very much easier (and quicker) to use the key.
