Make small electronic scheme open the door using intercom with sonoff relay.

I have a simple 5-wire intercom. And I want to connect a sonoff relay with wifi to it. So that the door can be opened automatically when someone presses the button on the intercom at the entrance of the building.

I have a photo of the diagram of the sonoff relay so that you can see it and also a photo of the diagram of the intercom.

I would like you to tell me what type of connection I have to make between the intercom circuit and the sonoff relay.

Using the application "ewelink", I would like that by default, when someone presses the call button of the intercom, the door opens automatically. And using "ewelink" the other option would be that when someone presses the button of the intercom that Do not open the door automatically, and the intercom only rings, as the current operation.

Skills: Electronics, Electrical Engineering, Microcontroller, Engineering, Arduino

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Project ID: #28315718