Hi all,
Currently, I'm working on a project where it would be nice to have a cheap touch sensitive switch. So, I looked at mister_e's entry about a touch sensor. I think it's a very clever idea, but there is a problem I can't make it work. I'm using a pic16f84 at 4 MHz, the same frequency that uses mister_e's pic. I have tried different combinations of resistors and I have added some capacitors but still it doesn't work.
When using an oscilloscope I can see the input signal at the input ports goes lower when touched by a finger but apparently not low enough to read a zero.
Does anybody have any ideas on how to make this work? Probably adding an op-amp would do the job. Thanks.

Robert.