The opposite of a ten turn potentiometer?

Hi Lupe

Why don't you map the 0-100 onto the change in resistance as a conventional potentiometer rotates through the arc that you describe?

John

That will be what I need to try next. To see if It will have enuff resolution.

To get a full scale reading, you may need to amplify the output of the pot or use a higher voltage on the pot.

If you do use a higher voltage across the pot, you may need to protect the arduino input with a Schottky diode to the arduino rail.

Depending on the application you might get away with this, it's more usual to use a different kind of sensor for measuring small displacements.

You can use strain gauges on a springy metal arm or LVDT sensors, or perhaps a rotational sensor designed to work over small angles.

If you tell us what you are trying to measure it would be possible to advise you better.

MK

I have 2 projects in the works for this application.

1. A volume pedal type device that the pot will need to be mounted at the pivot point. {As it is now I am not happy with my design that uses a vertical runner to turn a gear on a standard POT.}
   The above image shows the parts used in the current designs in the foot pedals that I am looking to replace. I am hoping to simply place a POT AT the pivot point in this design.
   
   
   
2. A gauging system for my filament on my 3-D printer. The Idea is to have a lever with a roller at the end of it amplify the thickness of the pinched filament to a mounted POT. That pot will send the readings every 10 seconds or so to a Microcontroller for data logging.
   
   POT on the left, roller and filament on the right. So small changes in the filament  effect large changes in the POT.
   
   

You might consider a slide pot in the first case.  You can get an accelerometer to act as a tilt sensor 'cause gravity.

You won't do better than the pot with rack and pinion for the foot pedal, at least not without a lot of complication.

For the filament thickness there are loads of options - how much are prepared to spend and how much time can you put into messing about.

Look here for some ideas:

https://www.aliexpress.com/wholesale?SearchText=displacement+sensor&initiative_id=RS_20160930091159

good range of prices - from about £10 to over £1000

MK

You can use a wedge of high Al material moving in the gap between a magnet and a linear hall-effect sensor for the foot pedal

If your foot pedal has a return spring you can measure its changes in inductance.  Ti has a nice, cheap kit for this.

Even simpler than a rack-and-pinion would be a very low-pitch screw that would turn a rotary pot.