Custom Dashboard Feasibility

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hello arduino users,
i new arduino, not technology have idea of how stuff works in theory, in application tricky part. i'm huge racing sim fan , build dashboard racing sim start car, ect. using real toggle switches local auto store, designed use in car.

all switches require 12vdc input , have separate solder tabs led. led requires 12v.
my question is, how supply 12v input switches , leds , how have arduino not fry when receiving 12v output switch.

the arduino receive signal swich , send keypress computer via usb. i'm confidant programming side easy, wiring switches power , single has me worried. people adept in electronics appreciated.

thanks in advance.     

quote
all switches require 12vdc input
that doesn't make sense. switch make-or-break device. not require specific voltage. there may maximum voltage (or, more likely, current rating) switch can deal with.



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