To make a Pressure Pad, take a piece of carpet, or a rug if you have one. You also need a few electric parts, but it shouldn't be any trouble to get them. Take two squares of tinfoil - roughly the same size - and glue one to the underside of your piece of carpet/rug/etc. Find two small pieces of foam, like those foam letters that you get for kids,or sponge and attach them to the foil square as well, at the edges. Place the other foil square on the floor, and attach a wire to each foil square. You can then use these wires to create any sort of circuit you like - maybe a klaxon, bulbs, alarm clock, anything really.