Touch sensor sensible to distance

Other Hardware Sensors
1

Hello everyone

I am struggling with building a particular kind of touch sensors which I'll now describe.

Basically I have a metal string which has close to 0 resistance. Not only I would like to know when I'm touching the string, but, if possible, also if the touch has been detected within the first 20cm of the string. The string is gonna be pressed in various regions, but I only need to sense eventual touches on the first 20 cms of it and I won't care about the others. I tried messing a bit with the capacitative sensors but it doesn't help much, since the ADC value increases when the number of fingers touching the wire increases, but I can't seem to get any information about the "where".

I think a resistor sensor could be better, but I have no idea if this is doable and where to start, since I am working with a wire that has almost 0 resistance.

Any ideas?

Thank you!

2

Seems to me work for RF 1 - 2 GHz, but complexity 'd above average EE.

3

Either I am not understanding your circuit or you are not understand electronics.
You can not get any distance information from a touch sensor whether the wire has significant resistance or not. A resistance in of itself does not reduce voltage, that is a beginners misconception.
Cair to post a schematic of what you have.