16 KEYS capacitive keyboard

This plan was realized in order to be used like a hidden push-button panel to the edge of the monitor. In fact the card has been inserted in a fissure in the wood, therefor hidden, and the activation of the keys happened for a capacitive effect from a distance of 1 cm (thickness of the used wood). The signalling of the pressed key it is sent to a further elaboration device both in SPI format and in UART (to convert in RS232 in order to read the key pressed directly on the PC with Hyperterminal).