I'm trying to build a ball and beam balance control system. I was thinking of using a metallic ball and two wires to make a linear potentiometer to give the ball's position. I'm not sure what to use as the resistive wire. Most wire I find doesn't seem to provide a sizable amount of resistance. I know I can amplify the output but I also want my system to be less susceptible to noise and accurate. I would also be open to other suggestions as to what I can use as a position sensor for the ball on the beam. Could someone post a link to some good material to use for the resistive wire? The length of the beam is only 8 inches and the ball has a 5/16" diameter. Thank you for any help.