The TTP229 is capacitive sensing design specifically for touch pad controls. The device has a built in regulator for the touch sensor. Stable sensing method can cover diversity conditions. Interface control panel links through non-conductive dielectric material. The main application is focused at replacing of the mechanical switch or button. This board can independently handle the 16 touch pads with 16 direct output pins. Features: onboard TTP229 capacitive touch sensing IC key 16 The onboard power indicator working voltage: 2. 4V-5. 5V Module can set output mode, key output mode, the output time and quick speed/low power choice.