Programmable off the shelf resistor

Discussion in 'The Projects Forum' started by jismagic, Feb 12, 2016.

  1. jismagic

    Thread Starter Member

    Sep 7, 2013
    77
    0
    I have 5-6 Analog inputs, with voltage input to it is controlled by resistance values in the range (0-200K, resolution 10ohms).
    Looking for programming /setitng resistance values over PC.

    Any ideas !

    (Not looking for- Analog out or voltage input due to other limitation)

    thanks
    jis
     
  2. hp1729

    Well-Known Member

    Nov 23, 2015
    1,950
    219
    Something like a digital pot? 10 ohm resolution might be hard to get. Maybe a digital pot at the output of a digital pot? I2C interface or simple 3-wire (Enable, up, down) are popular.
    (edited to add ...)
    Usually the pots work in 256 step increments, so a 200K pot steps in increments of about 780 ohms. If you put a 1K pot in series with that you get a resolution of about 4 ohms. Gross and fine adjustments.
     
    Last edited: Feb 12, 2016
  3. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    4,769
    969
    yep.. digital potentiometer
     
  4. marcf

    Member

    Dec 29, 2014
    136
    19
    If you need digital control of analog input voltages, why not use a I2C DAC?
     
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