certicoms:
Hi,For a project, I have to find the position of a finger on a line. Like a touchscreen but on only one dimension. For that I thought to use a resistive wire, then to read the voltage with an analog pin. But the wire must measure between 25 and 75 cm with at least 1k ohm.m to limit current and I've look on many websites and I can't find this kind of wire (or plate, this will also work). Does anyone know something like this? (I also try carbon on paper, it works but not really reliable and linear).
Thank you.
I don't think you can usefully measure finger position by voltage like this without using a conductive glove,
voltages on the body are strongly influenced by mains pickup. Once you use a conductive glove there's no
restriction on the resistance and ordinary resistance wire would be feasible - some voltage amplification
would be needed due to the low impedances involved.