Capacitive sensor input have several benefits over push buttons. First of all mechanical movement is eliminated – so input doesn’t wear out. Also capacitive input can be sealed, so it’s water proof and free from contamination. And third is more aesthetic – sensors can be integrated on almost any surface without mangling overall look. Ohneschuh experimented with capacitive input for Arduino and came out with simple but effective design of five buttons.
As a base he used aluminum sheet, five washers, plywood and several other necessary things like wires, glue. Electronic part consists of Arduino, Breadboard and power supply of your choice. He used CapSense as reference for connecting buttons to Arduino. He send button values to processing graphing program where he could visually see the performance of his build. Once proven, this setup can be successfully used in your next project.