Connecting an Arduino UNO/nano to a wii remote

So I recently opened my old wii remote to see the circuit and I was curious if I i could connect an arduino sensor to a specific button. I looked at it myself and did some additional research but I couldn't make any sense of it. In short how can I connect an arduino sensor to a button on the wii remote? Thanks in advance for your answers!

(picture is not mine, it is just for reference)

how can I connect an arduino sensor to a button on the wii remote?

Do you really mean what you say about connecting a sensor to a button on the remote or do you mean that you want to connect an Arduino pin to a switch on the remote ?

I am sorry I don't think I explained it too well, what I meant to say was to make a normal arduino curcuit and control the relay based on the sensors value. What I don't know how to do is connect the relay to the button pads on the circuit board of the wii remote.

I am still not entirely clear what you want to do but have you tried searching this forum for "wii remote" ?