Retrieve number from 3 digit screen of another device back into arduino and control a potentiometer with arduino? (self.arduino)

[santyoli]

Hello. I'm thinking about using arduino uno as a solution for a problem of mine, where i have a product (i can open it and mess around, but haven't done it yet). this product has a rotating knob (potentiometer) and a 3 digit screen (segment screen) My intention is to be able to rotate the knob to a desired value via commands from a linux software (that manages other things aswell), by sending the number from linux to the arduino, and the arduino doing 2 things:

getting the real screen values with some added extra wires internally in the product screen (how would one approach this?)
finding a way to change the potentiometer, if necessary by removing it and replacing with something. I also thought about fitting a low rpm dc motor to it, but probably there is some other way to generate variable resistance from arduino, to get the desired screen value.
if you guys have any tips for this project i'm about to start, please feel free to chat!

[Railroader]

@santyoli

getting the real screen values

How do You intend to do that? That's a suitable project for very experienced persons, and they wouldn't go for it.

@santyoli

replacing with something

Like what? Any suggestion?

What voltages are used at that existing pot?

A serious suggestion is warming up with more suitable projects.

[DaveEvans]

@santyoli

is some way to generate variable resistance from arduino

google this:

digital potentiometer arduino

@santyoli

getting the real screen values with some added extra wires internally in the product screen

(how would one approach this?)

By googling, of course. Try:

read 7 segment display with arduino

You will find that it is not easy to do with "extra wires internally."

A much simpler approach: use a camera to view the screen and interpret the numbers with a microcontroller (or RPi).