Changing voltage for POT input

Discussion in 'The Projects Forum' started by pclinklet, Jan 26, 2016.

  1. pclinklet

    Thread Starter New Member

    Jan 25, 2016
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    0
    I need to provide a 2v input voltage to a POT. I thought about the attached diagram but realized that, as the pot changes it resistance, that the input voltage would also change. I need a steady voltage to measure the POT setting with the ADC. FYI: The POT is on a linear actuator and my ADC has a built-in reference voltage of 2v so anything higher flat lines. Any help would be much appreciated!
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,998
    745
    Does the pot have three terminals or two?
     
  3. pclinklet

    Thread Starter New Member

    Jan 25, 2016
    3
    0
    The POT has 3. +, - and ladder.
     
  4. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,998
    745
    So your pot needs to go across the 2 V supply and the adc to the wiper and ground, this will give you a zero to 2V swing. I would use a regulator like lm317 set to 2V to give the precise voltage.

    Would this work?
     
  5. pclinklet

    Thread Starter New Member

    Jan 25, 2016
    3
    0
    Ahhh, lm317 is the ticket. Thanks!
     
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