Tell us about yourself!
Could you please post the compete schematics including the probe. It is probably just a lack of my education. From what I can see you connected +5v from usb to the ground of the inputs... which i thought was connected to -5v. What am i missing?
Do you have dxf files of the parts? What is the height of sides?Would it matter much if I use 1" PVC pipes?Thanks!