Keyestudio Touch Key USB Shield UNO R3 Development Board For Arduino

Have you seen the Makey touch keyboard simulation? MaKey MaKey is a very simple circuit board that can make any objects as a computing input device.
That’s to say, it can make stairway into a piano, bananas into a keyboard, plasticine into a joystick or even your families into a musical synthesizer.
The principle is simple. It uses ARDUINO microcontroller to simulate a keyboard, and lead out several keys, replacing the switch with touch key.
This Touch Key USB Shield is developed by KEYESTUDIO.
The shield uses touch input, namely, a double-contact switch, leading out touch port and ground connected to two touch electrodes. Because of body-resistance, when you touch the two electrodes, there is certain current flowing through between them, so can detect the touch event through the current detection.
More reference see the keyestudio Maker Touch Starter Kit.