I am making a visable alarm system for my house. This will be used to see if any window or doors opens, if so it will light up an led in the location it opened at. So far i got a project box, etched my house layout on it, drilled holes where my windows and doors are (for the led's). What i need to know is what kind of power and resistors would i use. The led's range from 2.2v to 3.5v and are 20ma. Any help with this would be great.