remote control of intercom speaker

[windyhills]

Hello there. I am very noob in this so I need a bit more help.

I have a 50ohm 0.5W speaker inside my apartment intercom device. That speaker connected to the intercom's board with two wires: red and black. The intercom device itself is pretty basic, only two external wires are connected to it.

I want to insert a switch so that I can turn on/off speaker. My idea is to cut the red wire, insert a relay and then control that relay with NodeMCU.

Now, I have NodeMCU and Omron G5V-1 (5VDC). How can I wire up those 3 things to turn on/off the speaker?
I made a "schematic" so if someone could draw wires on top of this image?


Note: please do not make professional schematics, I can't read those. Just draw lines in paint (like I did )

Thank you very much.

 

[Martaine2005]

Just put your switch on the red wire. That will cancel the speaker. No need for exciting new electronics to block!.