>The situation You have an interface. You have (might have) a pi/arduino device. You'll want to connect them together, but you do not know what wire goes where.
>What you'll have to do You'll have to reverse engineer (figure out) what the whole thing does, how it works, what goes where, etc. You'll have to figure out what each pin does, or what each combination of pin does, etc.
Flicking a switch will probably output something on a pin (or multiple pins), which you can parse through something like the pi/arduino to base actions on the output you're getting.
You can reverse engineer this sorta stuff in numerous ways, but I won't explain them here. Google around on 'reverse engineering electronics' or ask >>>/diy/
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