Hi Filip,

The kit from the Farnell catalogue has an RS-232 interface, so all the analogue pre-processing has been done for you. The "only" thing you would have to do is process the RS-232 output. It's ridiculously expensive, though...

But, if you have the new (January 2002) Farnell catalogue, check pages 362 and/or 441. There you can find devices with which to build a capacitive detector. Only drawback is that the largest device has only 64 "keys". For more information, check out the manufacturer's website: www.qprox.com

Regards,
Rob.