Analog Touch Keyboard Kit Set Touch Key USB Shield For Arduino Description: Simulating a keyboard by microcontroller, leads a few keys, and using the touch form instead of switches. Now we can also use an Arduino board and a touch key USB shield to achieve this effect. The input method of touch key USB shield is touch, using dual contacts touch switch, to lead the touch terminal and the ground terminal connected to the two electrodes touch. When human touch the two pole, because of the body resistance, a touch electrode between the two current flows, by detecting this current size of the touch event can be detected. Package included: 1 x Arduino UNO board 1 x Touch key USB shield 2 x USB Cable 1 bunch alligator clips