I just read what relay does from that link above. Shouldn't I be able to control the relay switch and still be in safe zone? Says here that relay has 2 distinctive parts and can control very high currents and voltages without getting in touch in DC part.
Now if I got it right: You control relay with a low voltage battery (5-9V). If you put the relay on 5V(lets say) Switch turns on. If you put it off again, switch turns off, right?
Now if this is right, it gave me a fairly simple idea. I could control the flow of current through 5V part, with a transistor. Transistor would let the current pass if it gets the signal(from my computer).
Now the hard part is, how can I effectively send that signal...