Thanks for being so patient with me, I'm learning alot. I'm going to try to just use a transistor first. I've measured the voltage across the two terminals on the keyboard I want to connect and am only seeing 0.01 volts. Would a 2n2222 transistor be ideal since I will be sending 5v to it's base. Do I need to implement any other component to protect the arduino? The way that I think I should hook it up is to have the arduino's 5v power going to the transistor's base, have terminal 1 go to the emitter and terminal 2 go to the collector.