This is a cool touch sensor from DFRobot. You can hook it up to the IO Expansion shield (for Arduino) directly. It includes a metallic tape with a sticky side. This makes it possible for you to place your sensors anywhere you want. This touch sensor works on a variety of surfaces; Metal, glass, plastic, rubber. It does not work on cardboard or wood.
NOTE:This sensor requires some basic soldering.
ITA-Touch module with Digital sensor cable(1 unit).
3x3cm copper with the sticky part(1 unit).
15cm wire(1 unit).