Piezoresistors

[mac]

I was looking some info about piezoresistors, generally used in load sensors. I want to know if they are suitable, and affordable, for controlling a wah.

mac

[Gus]

Maybe look for strain guage

http://en.wikipedia.org/wiki/Strain_gauge

[Paul Perry (Frostwave)]

Search google for "force sensing resistors".
As usual, the easiest place to buy them are the amateur robotics places.
A randomly selected example: http://www.trossenrobotics.com/store/p/3225-Force-Sensor.aspx

[mac]

Gus ,Paul, thx. I google but not with that keywords. Also in alldatasheet and similar.

The ideal is a small sensor that can go up to 50k-100k when foot pressed.

Another option is this kind of sensor and drive circuit:
http://www.tekscan.com/flexiforce/specs-flexiforce.html
With some adjustment, output of drive circuit can be coupled to the gate of a fet which will be the real variable resistor.

mac