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 make it possible for you to place your sensors anywhere you want. So, if you get sick of the typical push buttons, try this invisible button for your projects! 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. Specification Power supply: 3.3-5v Dimension: 15 * 10 mm/0.6 * 0.39 inches Pin definition: Digital output(Green wire) Power(Red wire) GND(Black wire) Documents Wiki (mini touch kit) sample code Assembly video tutorial video of sensor in use Schematic Shipping List ITA-Touch module with Digital sensor cable x1 3x3cm copper with the sticky part x1 15cm wire x1 Projects Project 1. Lightbulb? This Is Not a LightbulbHardware components DFRduino UNO R3 – Arduino Compatible *1 Mini Touch Kit *1 LED (generic) *3