I've got a small AVR project that would benefit from benefit from allowing a user to control more/less via simple tapping. If I implement this it has to be simple and cheap (and small), since the device is simple and cheap (and small) to start with. I just need to detect touch/no touch, nothing more.
The input pin would be the MOSI pin on the ISP connector, which can also be configured as an analog input (tiny24). I'd really like to limit myself to just one additional series resistor to minimize potential ESD damage.
I'll be giving this a try in the next few days, but I wanted to find out if anybody had done anything similar.